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As filed with the Securities and Exchange Commission on October 13, 2015

Registration Statement No. 333-            

UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

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FORM S-1
REGISTRATION STATEMENT
UNDER
THE SECURITIES ACT OF 1933

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AXSOME THERAPEUTICS, INC.
(Exact name of registrant as specified in its charter)

25 Broadway
9th Floor
New York, New York 10004
(212) 332-3241
(Address, including zip code, and telephone number, including area code, of registrant's principal executive offices)

Herriot Tabuteau, M.D.
Chief Executive Officer
Axsome Therapeutics, Inc.
25 Broadway
9th Floor
New York, New York 10004
(212) 332-3241
(Name, address, including zip code, and telephone number, including area code, of agent for service)

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          Approximate date of commencement of proposed sale to the public:
As soon as practicable after the effective date of this Registration Statement.

          If any of the securities being registered on this form are to be offered on a delayed or continuous basis pursuant to Rule 415 under the Securities Act of 1933, check the following box.    o

          If this Form is filed to register additional securities for an offering pursuant to Rule 462(b) under the Securities Act, please check the following box and list the Securities Act registration statement number of the earlier effective registration statement for the same offering.    o

          If this Form is a post-effective amendment filed pursuant to Rule 462(c) under the Securities Act, check the following box and list the Securities Act registration statement number of the earlier effective registration statement for the same offering.    o

          If this Form is a post-effective amendment filed pursuant to Rule 462(d) under the Securities Act, check the following box and list the Securities Act registration statement number of the earlier effective registration statement for the same offering.    o

          Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer or a smaller reporting company. See the definitions of "large accelerated filer," "accelerated filer" and "smaller reporting company" in Rule 12b-2 of the Exchange Act. (Check one):

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CALCULATION OF REGISTRATION FEE

(1)

Estimated solely for purposes of calculating the registration fee in accordance with Rule 457(o) under the Securities Act of 1933, as amended.

(2)

Includes shares of common stock subject to the underwriters' option to purchase additional shares of common stock.

(3)

Calculated pursuant to Rule 457(o) based on an estimate of the proposed maximum aggregate offering price.

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          The Registrant hereby amends this Registration Statement on such date or dates as may be necessary to delay its effective date until the Registrant shall file a further amendment which specifically states that this Registration Statement shall thereafter become effective in accordance with Section 8(a) of the Securities Act of 1933 or until the Registration Statement shall become effective on such date as the Commission, acting pursuant to said Section 8(a), may determine.

   

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The information contained in this preliminary prospectus is not complete and may be changed. We may not sell these securities until the registration statement filed with the Securities and Exchange Commission is declared effective. This preliminary prospectus is not an offer to sell these securities and we are not soliciting offers to buy these securities in any jurisdiction where the offer or sale is not permitted.

Subject to Completion, dated October 13, 2015

Preliminary Prospectus

            Shares

Common Stock

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We are offering            shares of our common stock. This is our initial public offering, and no public market currently exists for our common stock. We expect that the initial public offering price will be between $            and $            per share.

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We intend to apply to list our common stock on the NASDAQ             Market under the symbol "AXSM."

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We are an "emerging growth company," as defined in the Jumpstart Our Business Startups Act of 2012, and, as such, have elected to comply with certain reduced public company reporting requirements for this prospectus and future filings.

Investing in our common stock involves a high degree of risk. See "Risk Factors" beginning on page 13.

We have granted the underwriters an option to purchase up to an additional            shares of our common stock to cover over-allotments, if any.

Neither the Securities and Exchange Commission nor any state securities commission has approved or disapproved of these securities or passed upon the adequacy or accuracy of this prospectus. Any representation to the contrary is a criminal offense.

The underwriters expect to deliver the shares on or about                        , 2015.

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Ladenburg Thalmann

   

Prospectus dated                    , 2015

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        You should rely only on the information contained in this prospectus or contained in any free writing prospectus prepared by or on behalf of us or to which we have referred you. We have not, and the underwriters have not, authorized anyone to provide you with information that is different from that contained in such prospectuses. We are offering to sell shares of our common stock, and seeking offers to buy shares of our common stock, only in jurisdictions where such offers and sales are permitted. The information in this prospectus is accurate only as of the date of this prospectus, regardless of the time of delivery of this prospectus or any sale of our common stock.

        Until and including                        , 2015 (25 days after the date of this prospectus), all dealers that buy, sell or trade our common stock, whether or not participating in this offering, may be required to deliver a prospectus. This is in addition to the dealer's obligation to deliver a prospectus when acting as an underwriter and with respect to unsold allotments or subscriptions.

        For investors outside of the United States: neither we nor any of the underwriters have done anything that would permit this offering or possession or distribution of this prospectus in any jurisdiction where action for that purpose is required, other than in the United States. You are required to inform yourselves about and to observe any restrictions relating to this offering and the distribution of this prospectus.

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RISK FACTORS

        Investing in our common stock involves a high degree of risk. You should consider carefully the risks and uncertainties described below, together with all of the other information in this prospectus, including our consolidated financial statements and related notes, before deciding whether to purchase shares of our common stock. If any of the following risks is realized, our business, financial condition, results of operations and prospects could be materially and adversely affected. In that event, the price of our common stock could decline, and you could lose all or part of your investment.

RISKS RELATED TO OUR FINANCIAL CONDITION AND CAPITAL REQUIREMENTS

We have incurred significant losses since our inception, anticipate that we will incur substantial and increasing losses for the foreseeable future, and may never achieve or maintain profitability.

        We are a clinical stage biopharmaceutical company with a limited operating history. For the last several years, we have focused our efforts primarily on developing AXS-02 and AXS-05, with the goal of achieving regulatory approval. Since inception, we have incurred significant operating losses. Our net losses were $2.2 million, $6.0 million, and $4.3 million for the years ended December 31, 2013 and 2014, and the six months ended June 30, 2015, respectively. As of June 30, 2015, we had an accumulated deficit of $12.5 million. To date, we have not received regulatory approvals for any of our product candidates or generated any revenue from the sale of products, and we do not expect to generate any revenue in the foreseeable future. We expect to continue to incur substantial and increasing expenses and operating losses over the next several years, as we continue to develop AXS-02, AXS-05, and our other current and future product candidates. In addition, we expect to incur significant sales, marketing, and manufacturing expenses related to the commercialization of AXS-02, AXS-05, and our other current and future product candidates, if they are approved by the U.S. Food and Drug Administration, or FDA. As a result, we expect to continue to incur significant losses for the foreseeable future. We anticipate that our expenses will increase substantially as we:

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conduct our Phase 3 clinical trial with AXS-02 for the treatment of pain associated with complex regional pain syndrome, or CRPS;



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initiate and enroll patients in our Phase 3 clinical trials in other indications for AXS-02 and for AXS-05;



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in-license or acquire additional product candidates;



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conduct late-stage clinical trials for any product candidates that successfully complete early-stage clinical trials;



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seek regulatory approval for any product candidates that successfully complete late-stage clinical trials;



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conduct additional non-clinical studies with any product candidates;



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conduct preclinical studies with AXS-06 or any additional product candidates;



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increase manufacturing batch sizes of AXS-02 to satisfy FDA requirements for a marketing application submission;



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establish a sales, marketing, and distribution infrastructure, and scale up external manufacturing capabilities to commercialize any products for which we may obtain regulatory approval and that we choose not to license to a third party;



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require larger quantities of product;



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maintain, expand, and protect our intellectual property portfolio;



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hire additional clinical, quality control, and scientific personnel;

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add operational, financial, and management information systems and personnel, including personnel to support our product candidate development and planned future commercialization efforts; and



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add product candidates to our pipeline in the future.

        To become and remain profitable, we must succeed in developing and eventually commercializing products that generate significant revenue. We do not expect to generate significant revenue unless and until we are able to obtain marketing approval for, and successfully commercialize one or more of our product candidates. This will require us to be successful in a range of challenging activities, including completing preclinical testing and clinical trials of our product candidates, discovering additional product candidates, potentially entering into collaboration and license agreements, obtaining regulatory approval for product candidates and manufacturing, marketing, and selling any products for which we may obtain regulatory approval, achieving market acceptance of our products, satisfying any post-marketing requirements, maintaining appropriate distribution, setting prices, and obtaining reimbursement for our products from private insurance or government payors. We are only in the preliminary stages of most of these activities. We may never succeed in these activities and, even if we do, may never achieve profitability.

        Because of the numerous risks and uncertainties associated with pharmaceutical product development, we are unable to accurately predict the timing or amount of increased expenses we may incur or when, or if, we will be able to achieve profitability. If we are required by the FDA or comparable foreign regulatory authorities to perform studies in addition to those currently expected, or if there are any delays in completing our clinical trials or the development of any of our product candidates, our expenses could increase.

        Even if we do achieve profitability, we may not be able to sustain or increase profitability on a quarterly or annual basis. Our failure to become and remain profitable would depress the value of our company and could impair our ability to raise capital, expand our business, maintain our research and development efforts, diversify our product offerings or even continue our operations. A decline in the value of our company could also cause you to lose all or part of your investment.

We will need additional funding to conduct our future clinical trials and to complete development and commercialization of our product candidates. Even if this offering is successful, if we are unable to raise capital when needed, we would be forced to delay, reduce, or eliminate our product development programs or commercialization efforts.

        Conducting clinical trials, pursuing regulatory approvals, establishing outsourced manufacturing relationships and successfully manufacturing and commercializing our product candidates, including AXS-02 and AXS-05, is, and will be, a very time-consuming, expensive, and uncertain process that takes years to complete. We will need to raise additional capital to:

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fund our future clinical trials for our current product candidates, especially if we encounter any unforeseen delays or difficulties in our planned development activities;



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fund our operations and continue our efforts to hire additional personnel and build a commercial infrastructure to prepare for the commercialization of AXS-02, AXS-05, and our other current and future product candidates, if approved by the FDA;



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qualify and outsource the commercial-scale manufacturing of our products under current good manufacturing practices, or cGMP;



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develop additional product candidates, including AXS-06; and



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in-license other product candidates.

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        We believe that with our available cash as of June 30, 2015, along with the net proceeds from this offering, we will have sufficient funds to meet our projected operating requirements through at least the third quarter of 2017. We have based this estimate on assumptions that may prove to be wrong and we could spend our available financial resources faster than we currently expect. Further, we may not have sufficient financial resources to meet all of our objectives if AXS-02 or AXS-05 is approved, which could require us to postpone, scale back, or eliminate some, or all, of these objectives, including our potential launch activities relating to AXS-02 and AXS-05. Our future funding requirements will depend on many factors, including, but not limited to:

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the potential for delays in our efforts to seek regulatory approval for AXS-02 and AXS-05, and any costs associated with such delays;



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the costs of establishing a commercial organization to sell, market, and distribute AXS-02 and AXS-05;



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the rate of progress and costs related to our Phase 3 development of AXS-02 and AXS-05;



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the rate of progress and costs of our efforts to prepare for the submission of a new drug application, or NDA, for any product candidates that we may in-license or acquire in the future, and the potential that we may need to conduct additional clinical or preclinical trials to support applications for regulatory approval;



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the costs of filing, prosecuting, defending, and enforcing any patent claims and other intellectual property rights associated with our product candidates;



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the cost and timing of manufacturing sufficient supplies of AXS-02 and AXS-05 in preparation for commercialization;



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the effect of competing technological and market developments;



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subject to receipt of regulatory approval, revenue, if any, received from commercial sales of our product candidates;



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the terms and timing of any collaborative, licensing, co-promotion, or other arrangements that we may establish; and



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the success of the commercialization of AXS-02, AXS-05, and any other of our current or future product candidates.

        Future capital requirements will also depend on the extent to which we acquire or invest in additional businesses, products, and technologies. Until we can generate a sufficient amount of product revenue, if ever, we expect to finance future cash needs through public or private equity offerings, debt financings, royalties, and corporate collaboration and licensing arrangements, as well as through interest income earned on cash and investment balances. We cannot be certain that additional funding will be available on acceptable terms, or at all. If adequate funds are not available, we may be required to delay, reduce the scope of, or eliminate one or more of our development programs or our commercialization efforts.

We have a limited operating history and no history of commercializing products, which may make it difficult to evaluate our business and prospects.

        We commenced operations in 2012, and our operations to date have been limited to organizing and staffing our company, business planning, raising capital, and developing our product candidates, including undertaking preclinical studies and conducting clinical trials of our lead product candidates, AXS-02 and AXS-05, and our other product candidates. We have not yet demonstrated an ability to obtain regulatory approval for, or successfully commercialize, a product candidate. In addition, as a relatively nascent business, we may encounter unforeseen expenses, difficulties, complications, delays,

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and other known and unknown difficulties. If our product candidates are approved by the FDA, we will need to expand our capabilities to support commercial activities. We may not be successful in adding such capabilities. Consequently, any predictions about our future performance may not be as accurate as they could be if we had a history of successfully developing and commercializing pharmaceutical products.

RISKS RELATED TO OUR BUSINESS AND THE DEVELOPMENT OF OUR PRODUCT CANDIDATES

We are substantially dependent on the success of our lead product candidates, AXS-02 and AXS-05, and cannot guarantee that these product candidates will successfully complete our planned Phase 3 clinical trials, receive regulatory approval, or be successfully commercialized.

        We currently have no products approved for commercial distribution. We have invested a significant portion of our efforts and financial resources in the development of our most advanced product candidates, AXS-02 and AXS-05. Our business depends entirely on the successful development and commercialization of our product candidates, and in particular, AXS-02 and AXS-05, which may never occur. Our ability to generate revenues in the near term is substantially dependent on our ability to develop, obtain regulatory approval for, and then successfully commercialize AXS-02 and AXS-05. We currently generate no revenues from sales of any products, and we may never be able to develop or commercialize a marketable product.

        Our lead product candidates, AXS-02 and AXS-05, will require additional clinical and non-clinical development, regulatory approval, commercial manufacturing arrangements, establishment of a commercial organization, significant marketing efforts, and further investment before we generate any revenues from product sales. We initiated our Phase 3 trial with AXS-02 for the treatment of pain in patients with CRPS in July 2015, which we expect to complete by the end of 2017. However, we cannot assure you that we will meet this timeline. Further, we plan to initiate a Phase 3 clinical trial with AXS-05 for the treatment of treatment resistant depression, or TRD, in or before the first quarter of 2016. Our Phase 1 trial with AXS-05 was initially conducted with two tablets, one tablet consisting of dextromethorphan, or DM, and one tablet consisting of bupropion. However, we intend to conduct our Phase 3 clinical trial using one tablet containing both DM and bupropion. This change in formulation may delay the filing of our investigational new drug application, or IND, and thereby delay the start of our clinical trial with AXS-05 for the treatment of TRD.

        We are not permitted to market or promote any of our product candidates, including AXS-02 or AXS-05, before we receive regulatory approval from the FDA or comparable foreign regulatory authorities, and we may never receive such regulatory approval for any of our product candidates. Even if AXS-02 or AXS-05 is approved, they may be subject to limitations on the indicated uses for which they may be marketed, distribution restrictions, or to other conditions of approval, may contain significant safety warnings, including boxed warnings, contraindications, and precautions, may not be approved with label statements necessary or desirable for successful commercialization, or may contain requirements for costly post-market testing and surveillance, or other requirements, including the submission of a risk evaluation and mitigation strategy, or REMS, to monitor the safety or efficacy of the products. If we do not receive FDA approval for, and successfully commercialize, AXS-02 or AXS-05, we will not be able to generate revenue from these product candidates in the United States in the foreseeable future, or at all. Any significant delays in obtaining approval for and commercializing AXS-02 or AXS-05 will have a material adverse impact on our business and financial condition.

        We have not previously submitted an NDA to the FDA, or similar drug approval filings to comparable foreign authorities, for any product candidate, and we cannot be certain that AXS-02, AXS-05, or any other of our current or future product candidates will be successful in clinical trials or receive regulatory approval. In addition, we have not submitted an IND for AXS-05. AXS-02 has only completed one Phase 1 clinical trial. We also have not yet submitted our planned clinical trial protocol

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for AXS-02 for the treatment of CLBP with MCs. Furthermore, our product candidate AXS-06 is only in the early stages of product development and additional preclinical work is required before we may submit an IND and begin clinical trials.

        Our product candidates are susceptible to the risks of failure inherent at any stage of product development, including the appearance of unexpected adverse events or failure to achieve its primary endpoints in subsequent clinical trials, including our initiated and planned Phase 3 clinical trials. Further, our product candidates, including AXS-02 and AXS-05, may not receive regulatory approval even if they are successful in clinical trials.

        If approved for marketing by applicable regulatory authorities, our ability to generate revenues from AXS-02 or AXS-05 will depend on our ability to:

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create market demand for AXS-02 and AXS-05 through our own marketing and sales activities, and any other arrangements to promote these product candidates that we may otherwise establish;



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receive regulatory approval for claims that are necessary or desirable for successful marketing;



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hire, train, and deploy a sales force to commercialize AXS-02 and AXS-05 in the United States;



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manufacture AXS-02 and AXS-05 in sufficient quantities and at acceptable quality and manufacturing cost to meet commercial demand at launch and thereafter;



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establish and maintain agreements with wholesalers, distributors, and group purchasing organizations on commercially reasonable terms;



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create partnerships with, or offer licenses to, third parties to promote and sell AXS-02 in foreign markets where we receive marketing approval;



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maintain patent and trade secret protection and regulatory exclusivity for AXS-02 and AXS-05;



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launch commercial sales of AXS-02 and AXS-05, whether alone or in collaboration with others;



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achieve market acceptance of AXS-02 and AXS-05 by patients, the medical community, and third-party payors;



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achieve appropriate reimbursement for AXS-02 and AXS-05;



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effectively compete with other therapies; and



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maintain a continued acceptable safety profile of AXS-02 and AXS-05 following launch.

        As we continue to develop our other product candidates, including AXS-06, we expect to face similar risks related to our ability to develop, obtain regulatory approval for, and successfully commercialize such product candidates as we face with AXS-02 and AXS-05.

Potential conflicts of interest exist with respect to the intellectual property rights that we license from an entity owned by our Chief Executive Officer and Chairman of the Board, and it is possible that our interests and their interests may diverge.

        In 2012, we entered into three exclusive license agreements with Antecip Bioventures II LLC, or Antecip, an entity owned by our Chief Executive Officer and Chairman of the Board, Herriot Tabuteau, M.D., in which we were granted exclusive licenses to develop, manufacture, and commercialize Antecip's patents and applications related to the development of our current product candidates. See "Business—Material License Agreements." Although Dr. Tabuteau dedicates all of his working time to us because Antecip is an inactive intellectual property holding company, he may face potential conflicts of interest regarding these licensing transactions as a result of his ownership of Antecip. The license agreements provide that, subject to the reasonable consent of Antecip, we have the right to control the prosecution or defense, as the case may require, of a patent infringement claim involving the licensed intellectual property. Our interests with respect to pleadings and settlements in such cases may be at odds with those of Antecip. If there is a dispute between us and Antecip,

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Dr. Tabuteau will have a conflict of interest because he may, at the time of a prospective dispute, simultaneously have a financial interest in and owe a fiduciary duty to Antecip and simultaneously have a financial interest in and owe a fiduciary duty to us. For example, if a contractual dispute arises between us and Antecip under any of the license agreements we have with Antecip, Dr. Tabuteau may be in a position where he would benefit if Antecip prevails, to the detriment of our business or our investors, even though he is an officer and director of our company, because he is the sole owner of Antecip. Similarly, if we have a claim of any kind against Antecip, Dr. Tabuteau may be, even as our Chief Executive Officer and Chairman of the Board, reluctant to assert a claim by us against Antecip because of his financial interest in Antecip. We cannot assure you that any conflicts will be resolved in our favor, and as a result, our business could be impeded or materially harmed.

We may expend our limited resources to pursue a particular product candidate or indication and fail to capitalize on product candidates or indications that may be more profitable or for which there is a greater likelihood of success.

        Because we have limited financial and managerial resources, we focus on developing product candidates for specific indications that we identify as most likely to succeed, in terms of both its regulatory approval and commercialization. As such, we are currently primarily focused on the development of AXS-02 for the treatment of pain associated with CRPS and knee osteoarthritis, or OA, associated with bone marrow lesions, or BMLs, and AXS-05 for the treatment of TRD. As a result, we may forego or delay pursuit of opportunities with other product candidates or for other indications that may prove to have greater commercial potential. Additionally, as more fully described in "Business—Material License Agreements," we are required to pay to an entity owned by our Chief Executive Officer and Chairman of the Board certain royalty payments related to the development of AXS-02 and AXS-05, as well as AXS-04, a product candidate that is currently in early-stage development, but not with respect to the development of other product candidates, which may influence management's decision concerning which product candidates or indications to pursue. Our resource allocation decisions may cause us to fail to capitalize on viable commercial products or profitable market opportunities. Our spending on current and future research and development programs and product candidates for specific indications may not yield any commercially viable products. If we do not accurately evaluate the commercial potential or target market for a particular product candidate, we may relinquish valuable rights to that product candidate through collaboration, licensing, or other royalty arrangements in cases in which it would have been more advantageous for us to retain sole development and commercialization rights to such product candidate.

Our future growth may depend on our ability to identify and develop product candidates and if we do not successfully identify and develop product candidates or integrate them into our operations, we may have limited growth opportunities.

        A component of our business strategy is to continue to develop a pipeline of product candidates by developing products that we believe are a strategic fit with our focus on pain therapeutics and central nervous system, or CNS, therapeutics. However, these business activities may entail numerous operational and financial risks, including:

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difficulty or inability to secure financing to fund business activities for such development;



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disruption of our business and diversion of our management's time and attention;



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higher than expected development costs;



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exposure to unknown liabilities;



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difficulty in managing multiple product development programs; and



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inability to successfully develop new products or clinical failure.

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        For instance, our prior efforts have resulted in our decision not to further develop certain product candidates that, at one time, appeared to be promising. We have limited resources to identify and execute the developments of products. Moreover, we may devote resources to potential development that are never completed, or we may fail to realize the anticipated benefits of such efforts. If we do not successfully develop and commercialize product candidates, we may not be able to obtain product revenues in future periods.

If safety and efficacy data for our product candidates, a reference listed drug, or published literature does not satisfactorily demonstrate safety and efficacy to the FDA, or if the FDA and other regulators do not permit us to rely on the data of a reference listed drug or published literature, we may incur additional costs or experience delays in completing, or ultimately be unable to complete, the development and commercialization of our product candidates.

        We are not permitted to commercialize, market, promote, or sell any product candidate in the United States without obtaining marketing approval from the FDA. Comparable foreign regulatory authorities, such as the European Medicines Agency, or EMA, impose similar restrictions.

        In the United States, we currently plan to at least initially seek approval of our product candidates using the 505(b)(2) pathway. The FDA interprets Section 505(b)(2) of the Federal Food, Drug, and Cosmetic Act, or FDCA, for purposes of approving an NDA, to permit the applicant to rely, in part, upon published literature or the FDA's previous findings of safety and efficacy for an approved product. The FDA, though, requires companies to perform additional clinical trials or preclinical studies to support any deviation from the previously approved product and to support reliance on the FDA's prior findings of safety and efficacy or published literature.

        Under the 505(b)(2) pathway, the FDA may approve our product candidates for all or some of the label indications for which the referenced product has been approved, as well as for any new indication sought pursuant to the Section 505(b)(2) process. The label, however, may require all or some of the limitations, contraindications, warnings, or precautions included in the reference product's label, including a black box warning, or may require additional limitations, contraindications, warnings, or precautions, including class-wide warnings. For instance, antidepressants, including bupropion, include a class-wide black box warning regarding the increased risk of suicidal thoughts and behavior.

        Based on the side effects disclosed in FDA product labels for marketed drugs that contain the same active molecule as our product candidate, AXS-02 may result in nausea, fatigue, anemia, bone pain, constipation, fever, vomiting, dyspnea, hypersensitivity reactions, osteonecrosis of the jaw, renal toxicity, musculoskeletal pain, atypical fractures, hypocalcemia, bronchoconstriction, or other adverse events or potential adverse events reported or discussed in the product labels for zoledronic acid-containing products including Zometa, Reclast, and Aclasta.

        Based on the side effects disclosed in FDA product labels for marketed drugs that contain the same active molecules as our product candidate, AXS-05 may result in dry mouth, nausea, insomnia, dizziness, pharyngitis, abdominal pain, agitation, anxiety, tremor, seizure, increase in blood pressure and heart rate, hepatoxicity, hypoglycemia, thrombocytopenia or other hypersensitivity reactions, QT prolongation, left ventricular hypertrophy or left ventricular dysfunction, palpitation, sweating, tinnitus, myalgia, anorexia, urinary frequency, rash, seizure, hypertension, activation of mania or hypomania, psychosis and other neuropsychiatric reactions, suicidal ideation, suicide attempt, completed suicide, angle closure glaucoma, allergic or anaphylactoid or anaphylactic reactions, diarrhea, cough, vomiting, asthenia, peripheral edema, urinary tract infection, influenza, increased gamma-glutamyltransferase, flatulence, or other adverse events or potential adverse events reported or discussed in the product labels for bupropion-containing products or dextromethorphan-containing products including Wellbutrin, Wellbutrin SR, Wellbutrin XL, Zyban, Contrave, and Nuedexta.

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example, we intend to rely on data collected in certain investigator-initiated Phase 2 clinical trials and other third-party studies in the published literature as well as FDA findings of safety and efficacy for approved drug products containing the same active molecules in AXS-02 and AXS-05. If the FDA disagrees with our conclusions regarding the appropriateness of our reliance on a reference listed drug or published literature, we could be required to conduct additional clinical trials or other studies to support our NDA, which could lead to unanticipated costs and delays or to the termination of our development program. If we are unable to obtain approval for our pharmaceutical formulations through the 505(b)(2) NDA process, we may be required to pursue the more expensive and time-consuming 505(b)(1) approval process, which consists of full reports of investigations of safety and effectiveness conducted by or for the applicant. In addition, because we plan to submit NDAs for AXS-02 and AXS-05 pursuant to the 505(b)(2) process, we have not conducted Phase 2 clinical trials for these product candidates and, as such, we will have less experience with actual testing of the product candidate.

        There may also be circumstances under which the FDA would not allow us to pursue a 505(b)(2) application. For instance, should the FDA approve a pharmaceutically equivalent product to our product candidates, we would no longer be able to use the 505(b)(2) pathway. In that case, it is the FDA's policy that the appropriate submission would be an Abbreviated New Drug Application, or ANDA, for a generic version of the approved product. We may, however, not be able to immediately submit an ANDA, as we could be blocked by others' periods of patent and regulatory exclusivity protection.

        Notwithstanding the approval of a number of products by the FDA under 505(b)(2) over the last few years, pharmaceutical companies and others have objected to the FDA's interpretation of Section 505(b)(2). If the FDA's interpretation of Section 505(b)(2) is successfully challenged, the FDA may change its policies and practices with respect to Section 505(b)(2) regulatory approvals, which could delay or even prevent the FDA from approving any NDA that we submit pursuant to the 505(b)(2) process. Moreover, our inability to pursue a 505(b)(2) application could result in new competitive products reaching the market more quickly than our product candidates, which could hurt our competitive position and our business prospects.

        We may never receive approval for any of our product candidates, and even if our product candidates are approved under 505(b)(2), the approval may be subject to limitations on the indicated uses for which the products may be marketed, distribution restrictions, or to other conditions of approval; may contain significant safety warnings, including boxed warnings, contraindications, and precautions; may not be approved with label statements necessary or desirable for successful commercialization; or may contain requirements for costly post-market testing and surveillance or other requirements, including REMS, to monitor the safety or efficacy of the products. Moreover, any future actions or inquiries by the FDA with respect to the reference listed drug may require that we make changes to our labeling or, possibly, withdraw the product from the market.

An NDA submitted under Section 505(b)(2) subjects us to the risk that we may be subject to a patent infringement lawsuit or regulatory actions that would delay or prevent the review or approval of our product candidate.

        Applicants submitting NDAs under Section 505(b)(2) of the FDCA must provide a patent certification with the application for all reference listed drugs and for all brand name products identified in published literature upon which the 505(b)(2) applicant relies. One such certification is known as paragraph IV certification, which certifies that any patents listed in the FDA's publication, the Approved Drug Products with Therapeutic Equivalence Evaluations, commonly known as the Orange Book, are invalid, unenforceable or will not be infringed by the manufacture, use or sale of the product that is the subject of the 505(b)(2) NDA.

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        Under the Hatch-Waxman Act, the holder of patents or NDAs that the 505(b)(2) application references may file a patent infringement lawsuit after receiving notice of the paragraph IV certification. Filing of a patent infringement lawsuit against the filer of the 505(b)(2) applicant within 45 days of the patent or NDA owner's receipt of notice triggers a one-time, automatic, 30-month stay of the FDA's ability to approve the 505(b)(2) NDA. In such a case, the FDA may not approve the 505(b)(2) NDA until the earlier of 30 months from the receipt of the notice of the paragraph IV certification, the expiration of the patent, when the infringement case concerning each such patent was favorably decided in the applicant's favor or settled, or such shorter or longer period as may be ordered by a court. Accordingly, we may invest a significant amount of time and expense in the development of one or more product candidates only to be subject to significant delay and patent litigation before such product candidates may be commercialized, if at all. In addition, a 505(b)(2) application will not be approved until any existing non-patent exclusivity, such as exclusivity for obtaining approval of a new chemical entity, or NCE, or exclusivities for changes to NCEs listed in the Orange Book for the referenced product have expired or, if possible, are carved out from the label.

        Companies that produce branded reference listed drugs routinely bring litigation against applicants that seek regulatory approval to manufacture and market generic and reformulated forms of their branded products. These companies often allege patent infringement or other violations of intellectual property rights as the basis for filing suit. Likewise, patent holders may bring patent infringement suits against companies that are currently marketing and selling their approved generic or reformulated products. Litigation to enforce or defend intellectual property rights is often complex and often involves significant expense and can delay or prevent introduction or sale of our product candidates. If patents are held to be valid and infringed by our product candidates in a particular jurisdiction, we may be required to cease selling, relinquish or destroy existing stock, or pay monetary damages in that jurisdiction unless we could obtain a license from the patent holder. There may also be situations where we use our business judgment and decide to market and sell our approved products, notwithstanding the fact that allegations of patent infringement(s) have not been finally resolved by the courts, which is known as an "at-risk launch." The risk involved in doing so can be substantial because the remedies available to the owner of a patent for infringement may include, among other things, damages measured by the profits lost by the patent owner which may be greater than the profits earned by the infringer. In the case of willful infringement, such damages may be increased up to three times. An adverse decision in patent litigation could have a material adverse effect on our business, financial position and results of operations and could cause the market value of our common stock to decline. While, at this time, we believe that we will not need to file a paragraph IV certification for AXS-02 or AXS-05, should circumstances change, should the FDA disagree or should we be required to file a paragraph IV certification in the future for other product candidates, we may risk patent litigation and substantial delays.

The regulatory approval processes of the FDA and comparable foreign authorities are lengthy, time consuming and inherently unpredictable. If we are not able to obtain, or if there are delays in obtaining, required regulatory approvals, we will not be able to commercialize our product candidates as expected, and our ability to generate revenue will be materially impaired.

        The time required to obtain approval by the FDA and comparable foreign authorities is unpredictable but typically takes many years following the commencement of clinical trials and depends upon numerous factors, including the substantial discretion of the regulatory authorities. In addition, approval policies, regulations, or the type and amount of clinical data necessary to gain approval may change during the course of a product candidate's clinical development and may vary among jurisdictions, and may require us to amend our clinical trial protocols or conduct additional studies that require regulatory or institutional review board, or IRB, approval, or otherwise cause delays in the approval or rejection of an application. We have not obtained regulatory approval for any product candidate and it is possible that none of our existing product candidates, including AXS-02 and

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AXS-05, or any product candidates we may seek to develop in the future, will ever obtain regulatory approval. Any delay in obtaining or failure to obtain required approvals could materially adversely affect our ability or that of any of our collaborators to generate revenue from the particular product candidate, which likely would result in significant harm to our financial position and adversely impact our stock price.

        Our product candidates and the activities associated with their development and commercialization, including their design, testing, manufacture, safety, efficacy, recordkeeping, labeling, storage, approval, advertising, promotion, sale, and distribution, are subject to comprehensive regulation by the FDA and other regulatory agencies in the United States and by the EMA, and similar regulatory authorities outside the United States and Europe. Failure to obtain marketing approval for a product candidate will prevent us from commercializing the product candidate. We have no experience in filing and supporting the applications necessary to gain marketing approvals and expect to rely on third-party clinical research organizations, or CROs, and consultants to assist us in this process. Securing marketing approval requires the submission of extensive preclinical and clinical data and supporting information to regulatory authorities for each therapeutic indication to establish the product candidate's safety and efficacy for that indication. Securing marketing approval also requires the submission of information about the product manufacturing process to, and inspection of manufacturing facilities and clinical trial sites by, the regulatory authorities.

        Clinical testing is expensive and can take many years to complete, and its outcome is inherently uncertain. Failure can occur at any time during the clinical trial process. The results of preclinical studies and early clinical trials of our product candidates may not be predictive of the results of later-stage clinical trials. Product candidates in later stages of clinical trials may fail to show the desired safety and efficacy traits despite having progressed through preclinical studies and initial clinical trials. Preclinical studies may also reveal unfavorable product candidate characteristics, including safety concerns. A number of companies in the pharmaceutical industry have suffered significant setbacks in advanced clinical trials due to lack of efficacy or adverse safety profiles, notwithstanding promising results in earlier trials. Our future clinical trial results may not be successful. Moreover, should there be a flaw in a clinical trial, it may not become apparent until the clinical trial is well advanced.

        We may also experience numerous unforeseen events during, or as a result of, clinical trials that could delay or prevent our ability to receive marketing approval or commercialize our product candidates, including:

•

regulators or IRBs may not authorize us or our investigators to commence a clinical trial or conduct a clinical trial at a prospective trial site or amend trial protocols;



•

we may experience delays in reaching, or fail to reach, agreement on acceptable clinical trial contracts or clinical trial protocols with prospective trial sites and our CROs;



•

clinical trials of our product candidates may produce negative or inconclusive results, or our studies may fail to reach the necessary level of statistical significance, and we may decide, or regulators may require us, to conduct additional clinical trials or abandon product development programs. For instance, as CRPS may spontaneously resolve on its own, our studies in recently diagnosed patients may fail to show a treatment effect;



•

the number of patients required for clinical trials of our product candidates may be larger than we anticipate, enrollment in these clinical trials may be slower than we anticipate or participants may drop out of these clinical trials at a higher rate than we anticipate;



•

our third-party contractors may fail to comply with regulatory requirements or the clinical trial protocol, or meet their contractual obligations to us in a timely manner, or at all, or we may be required to engage in additional clinical trial site monitoring;



•

we, the regulators, or IRBs may require that we or our investigators suspend or terminate clinical research for various reasons, including noncompliance with regulatory requirements or a

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finding that the participants are being exposed to unacceptable health risks, undesirable side effects, or other unexpected characteristics of the product candidate, or due to findings of undesirable effects caused by a chemically or mechanistically similar drug or drug candidate;

•

changes in marketing approval policies during the development period rendering our data insufficient to obtain marketing approval;



•

changes in or the enactment of additional statutes or regulations;



•

changes in regulatory review for each submitted product application;



•

the cost of clinical trials of our product candidates may be greater than we anticipate or we may have insufficient funds for a clinical trial or to pay the substantial user fees required by the FDA upon the filing of an NDA;



•

the supply or quality of our product candidates or other materials necessary to conduct clinical trials of our product candidates may be insufficient or inadequate;



•

we may decide, or regulators may require us, to conduct additional clinical trials, analyses, reports, data, or preclinical trials, or we may abandon product development programs. For instance, for the development of AXS-02, the FDA has indicated that we will need to file a new IND for each indication to supplement the initial IND that we filed in 2013 for the treatment of pain associated with CRPS, and that we will need to conduct additional preclinical and clinical studies, such as non-clinical oral toxicology studies, and clinical studies to further assess the safety and duration of effect of AXS-02, AXS-02 food effects, and possibly repeat dosing. For AXS-05, we will need to conduct additional clinical and preclinical studies in addition to our planned Phase 3 trials in order to file an NDA for this product candidate. The outcome of our studies may further necessitate additional clinical or preclinical work;



•

we may fail to reach an agreement with regulators regarding the scope or design of our clinical trials;



•

we may have delays in adding new investigators or clinical trial sites, or we may experience a withdrawal of clinical trial sites;



•

patients that enroll in our studies may misrepresent their eligibility or may otherwise not comply with the clinical trial protocol, resulting in the need to drop the patients from the study or clinical trial, increase the needed enrollment size for the study or clinical trial or extend the study's or clinical trial's duration;



•

there may be regulatory questions regarding interpretations of data and results, or new information may emerge regarding our product candidates;



•

the FDA or comparable foreign regulatory authorities may disagree with our study design or our interpretation of data from preclinical studies and clinical trials or find that a product candidate's benefits do not outweigh its safety risks. For instance, in our communications with the FDA, the FDA has raised questions and had comments regarding our preclinical and clinical studies, such as comments on the acceptability of the proposed trial designs for our product candidates, the number of patients planned for our studies, our data analysis plans, the applicability of the serum biomarkers studied in our Phase 1 study of AXS-02, the species and doses used in our preclinical studies, and the results of our preclinical studies;



•

the FDA or comparable foreign regulatory authorities may not accept data from studies with clinical trial sites in foreign countries;



•

the FDA or comparable foreign regulatory authorities may disagree with our intended indications. For instance, the FDA has raised questions regarding the relevance of only studying knee OA with BMLs as well as the pathophysiology of the pain of knee OA associated with BMLs, and CLBP associated with MCs;

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•

the FDA or comparable foreign regulatory authorities may fail to approve or subsequently find fault with the manufacturing processes or our manufacturing facilities for clinical and future commercial supplies;



•

the FDA or comparable foreign regulatory authorities may take longer than we anticipate to make a decision on our product candidates; and



•

we may not be able to demonstrate that a product candidate provides an advantage over current standards of care or current or future competitive therapies in development.

        Moreover, if we are required to conduct additional clinical trials or other testing of our product candidates beyond those that we currently contemplate, if we are unable to successfully complete clinical trials or other testing of our product candidates, if the results of these trials or tests are not positive, or are only modestly positive or if there are safety concerns, we may:

•

be delayed in obtaining marketing approval for our product candidates;



•

not obtain marketing approval at all;



•

obtain approval for indications or patient populations that are not as broad as intended or desired or are not covered by our intellectual property;



•

obtain approval with labeling that includes significant use or distribution restrictions, including restrictions on the intended patient population, or safety warnings, including boxed warnings, contraindications, and precautions, or may not include label statements necessary or desirable for successful commercialization;



•

be subject to additional post-marketing testing and surveillance requirements, including REMS; or



•

have the product removed from the market after obtaining marketing approval.

        Our product candidate development costs will also increase if we experience delays in testing or approvals and we may not have sufficient funding to complete the testing and approval process for any of our product candidates. We may be required to obtain additional funds to complete clinical trials and prepare for possible commercialization of our product candidates. We do not know whether any preclinical tests or clinical trials will be required, will begin as planned, will need to be restructured, or will be completed on schedule, or at all. Significant delays relating to any preclinical or clinical trials also could shorten any periods during which we may have the exclusive right to commercialize our product candidates or allow our competitors, or the competitors of our collaborators, to bring products to market before we do and impair our ability to successfully commercialize our product candidates and may harm our business and results of operations. In addition, many of the factors that cause, or lead to, such delays may ultimately lead to the denial of marketing approval of any of our product candidates. If any of this occurs, our business, financial condition, results of operations, and prospects will be materially harmed.

        Regulatory authorities have substantial discretion in the approval process and may refuse to accept any application or may decide that our data are insufficient for approval and require additional preclinical, clinical or other studies. In addition, varying interpretations of the data obtained from preclinical and clinical testing could delay, limit or prevent marketing approval of a product candidate. Furthermore, there is the possibility that the FDA has not previously reviewed product candidates for the indications we are pursuing, such as bisphosphonates for the treatment of pain. As a result, we may experience delays in regulatory approval due to uncertainties in the approval process.

        Finally, even if we were to obtain approval, regulatory authorities may approve any of our product candidates for fewer or more limited indications or uses than we request, may contain significant safety warnings, including black box warnings, contraindications, and precautions, may grant approval

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contingent on the performance of costly post-marketing clinical trials, surveillance, or other requirements, including REMS to monitor the safety or efficacy of the product, or may approve a product candidate with a label that does not include the labeling claims necessary or desirable for the successful commercialization of that product candidate. Any of these scenarios could compromise the commercial prospects for our product candidates.

        If we experience delays in obtaining approval, if we fail to obtain approval of a product candidate or if the label for a product candidate does not include the labeling claims necessary or desirable for the successful commercialization of that product candidate, the commercial prospects for such product candidate may be harmed and our ability to generate revenues from that product candidate will be materially impaired.

The FDA may determine that AXS-02, AXS-05, or any other of our current or future product candidates have undesirable side effects that could delay or prevent their regulatory approval or commercialization.

        Undesirable side effects caused by our product candidates could cause us, IRBs, and other reviewing entities or regulatory authorities to interrupt, delay, or halt clinical trials and could result in a more restrictive label or the delay or denial of regulatory approval by the FDA or other comparable foreign authorities. For example, if concerns are raised regarding the safety of a new drug as a result of undesirable side effects identified during clinical or preclinical testing, the FDA may order us to cease further development, decline to approve the drug or issue a letter requesting additional data or information prior to making a final decision regarding whether or not to approve the drug.

        The number of requests for additional data or information issued by the FDA in recent years has increased, and resulted in substantial delays in the approval of several new drugs. Undesirable side effects caused by AXS-02, AXS-05, or any other of our current or future product candidates could also result in denial of regulatory approval by the FDA or other comparable foreign authorities for any or all targeted indications or the inclusion of unfavorable information in our product labeling, such as limitations on the indicated uses for which the products may be marketed or distributed, a label with significant safety warnings, including boxed warnings, contraindications, and precautions, a label without statements necessary or desirable for successful commercialization, or may result in requirements for costly post-marketing testing and surveillance, or other requirements, including REMS, to monitor the safety or efficacy of the products, and in turn prevent us from commercializing and generating revenues from the sale of AXS-02, AXS-05, or any other of our current or future product candidates.

        To date, the most commonly reported adverse events observed in the completed clinical trial of AXS-02 include headache, fever, musculoskeletal pain, diarrhea, abdominal pain, nausea, myalgia, and chills. Some reported adverse events led to discontinuation from our trial of AXS-02. These adverse events included abdominal pain.

        To date, the most commonly reported adverse events observed in a completed clinical trial with zoledronic acid, the active molecule in AXS-02, for the treatment of the pain of knee OA associated with BMLs include acute phase reactions, primarily cold or flu-like symptoms and headaches.

        To date, the most commonly reported adverse events observed in a completed clinical trial with zoledronic acid, the active molecule in AXS-02, for the treatment of chronic low back pain, or CLBP, associated with Modic changes, or MCs, include fever, headache, myalgia, arthralgia, pain, nausea, and flu-like symptoms. Sinusitis requiring temporary hospitalization following zoledronic acid infusion was reported in one patient and was therefore classified as a serious adverse event.

        To date, the most commonly reported adverse events observed in the completed clinical trials of the combination of DM, one of the active molecules in AXS-05, and quinidine for the treatment of pseudobulbar affect and agitation in patients with probable AD include falls, dizziness, headache, nausea, diarrhea, and urinary tract infection.

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        To date, the most commonly reported adverse events observed in the completed clinical trials of AXS-05 include headache, nausea, dizziness, insomnia, dry mouth, fatigue, hypoesthesia, disturbance in attention, hyperhidrosis, increased heart rate, palpitation, constipation, diarrhea, increased blood pressure, and tremor. Some reported adverse events resulted in discontinuations from our trials of AXS-05. These adverse events included chest pain, headache, abdominal pain, diarrhea, signs of potential allergic reactions, atrial tachycardia, disturbance in attention, metamorphosia, tremor, feeling hot, dizziness, dyspnea, and increased respiratory rate.

        If any of our other product candidates is associated with serious adverse events or undesirable side effects or have properties that are unexpected, we may need to abandon development or limit development of that product candidate to certain uses or subpopulations in which the undesirable side effects or other characteristics are less prevalent, less severe or more acceptable from a risk-benefit perspective. The drug-related side effects could affect patient recruitment or the ability of enrolled patients to complete the trial or result in potential product liability claims. Any of these occurrences may significantly harm our business, financial condition, results of operations, and prospects.

If we experience delays or difficulties in the enrollment of patients in clinical trials, our receipt of necessary regulatory approvals could be delayed or prevented.

        We may not be able to initiate or continue conducting clinical trials for our product candidates if we are unable to locate and enroll a sufficient number of eligible patients to participate in these trials as required by the FDA or similar regulatory authorities outside the United States. Some of our competitors have ongoing clinical trials for product candidates that treat the same indications as our product candidates, and patients who would otherwise be eligible for our clinical trials may instead enroll in clinical trials of our competitors' product candidates. Patient enrollment is affected by other factors including:

•

the size and nature of the patient population;



•

the severity of the disease under investigation;



•

the eligibility criteria for, and design of, the clinical trial in question, including factors such as frequency of required assessments, length of the study and ongoing monitoring requirements;



•

the perceived risks and benefits of the product candidate under study, including the potential advantages or disadvantages of the product candidate being studied in relation to other available therapies;



•

competition in recruiting and enrolling patients in clinical trials;



•

the efforts to facilitate timely enrollment in clinical trials;



•

the patient referral practices of physicians;



•

effectiveness of publicity created by clinical trial sites regarding the trial;



•

patients' ability to comply with the specific instructions related to the trial protocol, proper documentation, and use of the drug product;



•

inability to obtain or maintain patient informed consents;



•

risk that enrolled patients will drop out before completion;



•

the ability to monitor patients adequately during and after treatment; and



•

the proximity and availability of clinical trial sites for prospective patients.

        Our inability to enroll a sufficient number of patients for our clinical trials would result in significant delays and could require us to abandon one or more clinical trials altogether. For instance,

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because we are seeking regulatory approval for certain indications that may have a narrow or small patient population, it may be difficult to find patients eligible to participate in our clinical studies at a sufficient rate or in a sufficient quantity. Our current development plan for AXS-02 contemplates recruiting and enrolling more than 475 patients for our Phase 3 clinical trials for the treatment of pain associated with CRPS. We may encounter difficulties or delays in completing our planned enrollments for these trials. In addition, because of some of our other entry criteria for our Phase 3 clinical trials with AXS-02 for the treatment of pain associated with CRPS, such as the requirement that patients cease any usage of previous opioid therapy, we may further limit our potential patient population. For our planned Phase 3 clinical trials with AXS-02 for the treatment of the pain of knee OA associated with BMLs and CLBP associated with type 1 or mixed type 2 MCs, enrollment will require the existence of radiographic biomarkers and we may require patients to discontinue use of their existing medication before participating in our clinical trials. We may also exclude patients who have been treated with opioids or other classes of medications. For our planned Phase 3 clinical trial with AXS-05 for the treatment of TRD, we will require patients to have previously failed one or two, or perhaps more, antidepressant treatments, which further limits our potential patient population. As a result, these entry criteria may make it difficult for us to enroll patients in any of our clinical trials. Moreover, patients in our clinical trials, especially patients in our control groups, may be at risk for dropping out of our studies if they are not experiencing relief of their symptoms. A significant number of withdrawn patients would compromise the quality of our data.

        Enrollment delays in our clinical trials may result in increased development costs for our product candidates, or the inability to complete development of our product candidates, which would cause the value of our company to decline, limit our ability to obtain additional financing, and materially impair our ability to generate revenues.

One of our lead product candidates, AXS-05, if approved, will compete in the marketplace with other bupropion products that are subject to restrictive marketing and distribution regulations, which if applied to our product candidates would restrict their use and harm our ability to generate profits.

        Some of the currently approved bupropion products require REMS. REMS programs may require medication guides for patients, special communication plans to healthcare professionals or elements to assure safe use, such as restricted distribution methods, distribution only to certain medical professionals, training for medical professionals prescribing our product candidates, patient registries or other risk minimization tools. The FDA may determine that AXS-05 will require a REMS program. We cannot predict whether REMS will be required as part of the FDA's approval of our product candidates and, if required, what those requirements might be. Any limitations on approval or marketing could restrict the commercial promotion, distribution, prescription or dispensing of our product candidates, if approved. If a REMS program is required, depending on the extent of the REMS requirements, the program might significantly increase our costs to commercialize these product candidates or could place a substantial burden on medical professionals, discouraging their use of our product candidates, if approved. Furthermore, risks of our product candidates that are not adequately addressed through proposed REMS for such product candidates may also prevent or delay their approval for commercialization.

Changes in product candidate manufacturing or formulation may result in additional costs or delay.

        As product candidates are developed through preclinical studies to late-stage clinical trials towards approval and commercialization, it is common that various aspects of the development program, such as manufacturing methods and formulation, are altered along the way in an effort to optimize processes and results. For instance, our initial studies in AXS-05 were completed with two separate tablets containing dextromethorphan and bupropion. Our Phase 3 studies, however, will be conducted using a single tablet containing both active ingredients. Such changes carry the risk that they will not achieve

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these intended objectives. Any of these changes could cause our product candidates to perform differently and affect the results of planned clinical trials or other future clinical trials conducted with the altered materials. Such changes may also require additional testing, FDA notification, or FDA approval. This could delay completion of clinical trials, require the conduct of bridging clinical trials or studies, or the repetition of one or more clinical trials, increase clinical trial costs, delay approval of our product candidates and jeopardize our ability to commence product sales and generate revenue.

Failure to obtain marketing approval in international jurisdictions would prevent our product candidates from being marketed abroad.

        In order to market and sell our products in the European Union and many other jurisdictions, we or our third-party collaborators must obtain separate marketing approvals and comply with numerous and varying regulatory requirements. The approval procedure varies among countries and can involve additional testing. The time required to obtain approval may differ substantially from that required to obtain FDA approval. The regulatory approval process outside the United States generally includes all of the risks associated with obtaining FDA approval. In addition, in many countries outside the United States, it is required that the product be approved for reimbursement before the product can be approved for sale in that country. We or these third parties may not obtain approvals from regulatory authorities outside the United States on a timely basis, if at all. Approval by the FDA does not ensure approval by regulatory authorities in other countries or jurisdictions, and approval by one regulatory authority outside the United States does not ensure approval by regulatory authorities in other countries or jurisdictions or by the FDA. However, the failure to obtain approval in one jurisdiction may compromise our ability to obtain approval elsewhere. We may not be able to file for marketing approvals and may not receive necessary approvals to commercialize our products in any market.

A Fast Track product designation or other designation to facilitate product candidate development may not lead to faster development or regulatory review or approval process, and it does not increase the likelihood that our product candidates will receive marketing approval.

        We have received a Fast Track product designation for AXS-02 for the treatment of pain associated with CRPS, and we may seek Fast Track designation for other of our current or future product candidates. Receipt of a designation to facilitate product candidate development is within the discretion of the FDA. Accordingly, even if we believe one of our product candidates meets the criteria for a designation, the FDA may disagree. In any event, the receipt of such a designation for a product candidate may not result in a faster development process, review or approval compared to drugs considered for approval under conventional FDA procedures and does not assure ultimate marketing approval by the FDA. In addition, the FDA may later decide that the products no longer meet the designation conditions.

Regulatory approval is limited by the FDA to those specific indications and conditions for which clinical safety and efficacy have been demonstrated, and we may be subject to fines, penalties, injunctions, or other enforcement actions if we are determined to be promoting the use of our products for unapproved or "off-label" uses, resulting in damage to our reputation and business.

        We, and any of our collaborators, must comply with requirements concerning advertising and promotion for any of our product candidates for which we or they obtain marketing approval. Promotional communications with respect to prescription drugs are subject to a variety of legal and regulatory restrictions and continuing review by the FDA, Department of Justice, Department of Health and Human Services' Office of Inspector General, state attorneys general, members of Congress, and the public. When the FDA or comparable foreign regulatory authorities issue regulatory approval for a product candidate, the regulatory approval is limited to those specific uses and indications for which a product is approved. If we are not able to obtain FDA approval for any desired

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uses or indications for our products and product candidates, we may not market or promote our products for those indications and uses, referred to as off-label uses, and our business may be adversely affected. We further must be able to sufficiently substantiate any claims that we make for our products including claims comparing our products to other companies' products.

        While physicians may choose to prescribe drugs for uses that are not described in the product's labeling and for uses that differ from those tested in clinical studies and approved by the regulatory authorities, we are prohibited from marketing and promoting the products for indications and uses that are not specifically approved by the FDA. These off-label uses are common across medical specialties and may constitute an appropriate treatment for some patients in varied circumstances. Regulatory authorities in the United States generally do not restrict or regulate the behavior of physicians in their choice of treatment within the practice of medicine. Regulatory authorities do, however, restrict communications by pharmaceutical companies concerning off-label use.

        If we are found to have impermissibly promoted any of our product candidates, we may become subject to significant liability and government fines. The FDA and other agencies actively enforce the laws and regulations regarding product promotion, particularly those prohibiting the promotion of off-label uses, and a company that is found to have improperly promoted a product may be subject to significant sanctions. The federal government has levied large civil and criminal fines against companies for alleged improper promotion and has enjoined several companies from engaging in off-label promotion. The FDA has also requested that companies enter into consent decrees of permanent injunctions under which specified promotional conduct is changed or curtailed. Thus, we and any of our collaborators will not be able to promote any products we develop for indications or uses for which they are not approved.

        In the United States, engaging in the impermissible promotion of our products, following approval, for off-label uses can also subject us to false claims and other litigation under federal and state statutes, including fraud and abuse and consumer protection laws, which can lead to civil and criminal penalties and fines, agreements with governmental authorities that materially restrict the manner in which we promote or distribute drug products and do business through, for example, corporate integrity agreements, suspension or exclusion from participation in federal and state healthcare programs, and debarment from government contracts and refusal of future orders under existing contracts. These false claims statutes include the federal civil False Claims Act, which allows any individual to bring a lawsuit against a pharmaceutical company on behalf of the federal government alleging submission of false or fraudulent claims, or causing others to present such false or fraudulent claims, for payment by a federal program such as Medicare or Medicaid. If the government decides to intervene and prevails in the lawsuit, the individual will share in the proceeds from any fines or settlement funds. If the government declines to intervene, the individual may pursue the case alone. These False Claims Act lawsuits against pharmaceutical companies have increased significantly in volume and breadth, leading to several substantial civil and criminal settlements, up to $3.0 billion, pertaining to certain sales practices and promoting off-label drug uses. This growth in litigation has increased the risk that a pharmaceutical company will have to defend a false claim action; pay settlement fines or restitution, as well as criminal and civil penalties; agree to comply with burdensome reporting and compliance obligations; and be excluded from Medicare, Medicaid, or other federal and state healthcare programs. If we or our collaborators do not lawfully promote our approved products, if any, we may become subject to such litigation and, if we do not successfully defend against such actions, those actions may have a material adverse effect on our business, financial condition, results of operations, and prospects.

        In the United States, the distribution of product samples to physicians must further comply with the requirements of the U.S. Prescription Drug Marketing Act. If the FDA determines that our promotional activities violate its regulations and policies pertaining to product promotion, it could request that we modify our promotional materials or subject us to regulatory or other enforcement actions, including issuance of warning letters or untitled letters, suspension or withdrawal of an

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approved product from the market, requests for recalls, payment of civil fines, disgorgement of money, imposition of operating restrictions, injunctions, or criminal prosecution. These regulatory and enforcement actions could significantly harm our business, financial condition, results of operations, and prospects.

Even if AXS-02 or AXS-05 receive regulatory approval, we will be subject to ongoing obligations and continued regulatory review, which may result in significant additional expense. Additionally, any of our product candidates, if approved, could be subject to labeling and other restrictions and market withdrawal and we may be subject to penalties if we fail to comply with regulatory requirements or experience unanticipated problems with our products.

        Any product candidate for which we obtain marketing approval will be subject to extensive and ongoing requirements of and review by the FDA and other regulatory authorities, including requirements related to the manufacturing processes, post-approval clinical data, labeling, packaging, distribution, adverse event reporting, storage, recordkeeping, export, import, advertising, marketing, and promotional activities for such product. These requirements further include submissions of safety and other post-marketing information, including manufacturing deviations and reports, registration and listing requirements, the payment of annual fees for our product candidates, if approved, and the establishments at which they are manufactured, continued compliance with cGMP requirements relating to manufacturing, quality control, quality assurance, and corresponding maintenance of records and documents, requirements regarding the distribution of samples to physicians and recordkeeping, and good clinical practices, or GCPs, for any clinical trials that we conduct post-approval. Even if marketing approval of a product candidate is granted, the approval may be subject to limitations on the indicated uses and populations for which the product may be marketed or to the conditions of approval, including significant safety warnings, including boxed warnings, contraindications, and precautions that are not desirable for successful commercialization and any requirement to implement a REMS that render the approved product not commercially viable or other post-market requirements or restrictions. Any such restrictions could limit sales of the product.

        We and any of our collaborators, including our contract manufacturers, could be subject to periodic unannounced inspections by the FDA to monitor and ensure compliance with cGMPs. Application holders must further notify the FDA, and depending on the nature of the change, obtain FDA pre-approval for product and manufacturing changes. Application fees may apply to certain changes.

        In addition, later discovery of previously unknown adverse events or that the drug is less effective than previously thought or other problems with our products, manufacturers or manufacturing processes, or failure to comply with regulatory requirements both before and after approval, may yield various results, including:

•

restrictions on manufacturing or distribution, or marketing of such products;



•

restrictions on the labeling, including required additional warnings, such as black box warnings, contraindications, precautions, and restrictions on the approved indication or use;



•

modifications to promotional pieces;



•

requirements to conduct post-marketing studies or clinical trials;



•

clinical holds or termination of clinical trials;



•

requirements to establish or modify a REMS or a comparable foreign authority may require that we establish or modify a similar strategy, that may, for instance, require us to create a Medication Guide outlining the risks of the previously unidentified side effects for distribution

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to patients, or restrict distribution of the product, if and when approved, and impose burdensome implementation requirements on us;

•

changes to the way the drug is administered;



•

liability for harm caused to patients or subjects;



•

reputational harm;



•

the drug becoming less competitive;



•

warning, untitled, or cyber letters;



•

suspension of marketing or withdrawal of the products from the market;



•

regulatory authority issuance of safety alerts, Dear Healthcare Provider letters, press releases, or other communications containing warnings or other safety information about the drug;



•

refusal to approve pending applications or supplements to approved applications that we submit;



•

recall of products;



•

fines, restitution or disgorgement of profits or revenues;



•

suspension or withdrawal of marketing approvals;



•

refusal to permit the import or export of our products;



•

product seizure or detention;



•

FDA debarment, debarment from government contracts, and refusal of future orders under existing contracts, exclusion from federal healthcare programs, consent decrees, or corporate integrity agreements; or



•

injunctions or the imposition of civil or criminal penalties, including imprisonment.

        Any of these events could prevent us from achieving or maintaining market acceptance of the particular product candidate, if approved, or could substantially increase the costs and expenses of commercializing such product, which in turn could delay or prevent us from generating significant revenues from its sale. Any of these events could further have other material and adverse effects on our operations and business and could adversely impact our stock price and could significantly harm our business, financial condition, results of operations, and prospects.

        The FDA's policies may change and additional government regulations may be enacted that could prevent, limit or delay regulatory approval of our product candidates or that could impose additional regulatory obligations on us if our product candidates are approved. If we are slow or unable to adapt to changes in existing requirements or the adoption of new requirements or policies, or if we are not able to maintain regulatory compliance, we may lose any marketing approval that we may have obtained and be subject to regulatory enforcement action.

        Should any of the above actions take place, they could adversely affect our ability to achieve or sustain profitability. Further, the cost of compliance with post-approval regulations may have a negative effect on our operating results and financial condition.

If we obtain approval to commercialize our product candidates outside of the United States, a variety of risks associated with international operations could materially adversely affect our business.

        If any of our product candidates are approved for commercialization, we may enter into agreements with third parties to market them on a worldwide basis or in more limited geographical

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regions. We expect that we will be subject to additional risks related to entering into international business relationships, including:

•

different regulatory requirements for approval of drugs in foreign countries;



•

the potential for so-called parallel importing, which is what happens when a local seller, faced with high or higher local prices, opts to import goods from a foreign market (with low or lower prices) rather than buying them locally;



•

challenges enforcing our contractual and intellectual property rights, especially in those foreign countries that do not respect and protect intellectual property rights to the same extent as the United States;



•

unexpected changes in tariffs, trade barriers, and regulatory requirements and in the health care policies of foreign jurisdictions;



•

economic weakness, including inflation, or political instability in particular foreign economies and markets;



•

compliance with tax, employment, immigration, and labor laws for employees living or traveling abroad;



•

foreign taxes, including withholding of payroll taxes;



•

foreign currency fluctuations, which could result in increased operating expenses and reduced revenues, and other obligations incident to doing business in another country;



•

difficulties staffing and managing foreign operations;



•

workforce uncertainty in countries where labor unrest is more common than in the United States;



•

costs of compliance with U.S. laws and regulations for foreign operations, including the Foreign Corrupt Practices Act or comparable foreign regulations, and the risks and costs of non-compliance;



•

production shortages resulting from any events affecting raw material supply or manufacturing capabilities abroad; and



•

business interruptions resulting from geopolitical actions, including war and terrorism, or natural disasters including earthquakes, typhoons, floods, and fires.

        These and other risks associated with our international operations may materially adversely affect our ability to attain or maintain profitable operations.

We will need to obtain FDA approval of any proposed product names, and any failure or delay associated with such approval may adversely affect our business.

        Any name we intend to use for our product candidates will require approval from the FDA regardless of whether we have secured a formal trademark registration from the U.S. Patent and Trademark Office, or USPTO. The FDA typically conducts a review of proposed product names, including an evaluation of the potential for confusion with other product names. The FDA may also object to a product name if it believes the name inappropriately implies medical claims or contributes to an overstatement of efficacy. If the FDA objects to any of our proposed product names, we may be required to adopt alternative names for our product candidates. If we adopt alternative names, we would lose the benefit of any existing trademark applications for such product candidate and may be required to expend significant additional resources in an effort to identify a suitable product name that would qualify under applicable trademark laws, not infringe the existing rights of third parties, and be

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acceptable to the FDA. We may be unable to build a successful brand identity for a new trademark in a timely manner or at all, which would limit our ability to commercialize our product candidates.

RISKS RELATED TO THE COMMERCIALIZATION OF OUR PRODUCT CANDIDATES

We face significant competition from other pharmaceutical and biotechnology companies, academic institutions, government agencies, and other research organizations. Our operating results will suffer if we fail to compete effectively.

        The development and commercialization of new drug products is highly competitive. We face competition with respect to our current product candidates, and will face competition with respect to any product candidates that we may seek to develop or commercialize in the future, from major pharmaceutical companies, specialty pharmaceutical companies, and biotechnology companies worldwide. There are a number of large pharmaceutical and biotechnology companies that currently market and sell products or are pursuing the development of products for the treatment of pain and central nervous system disorders. Potential competitors also include academic institutions, government agencies, and other public and private research organizations that conduct research, seek patent protection, and establish collaborative arrangements for research, development, manufacturing, and commercialization.

        Specifically, there are a large number of companies developing or marketing therapies for the treatment and management of pain and other CNS disorders, including many major pharmaceutical and biotechnology companies. Among the companies that currently market or are developing therapies that, if approved, our product candidates would potentially compete with include: Alkermes plc; Allergan plc; Carbylan Therapeutics, Inc.; Eli Lilly and Company; Flexion Therapeutics, Inc.; Grunenthal GmbH; Janssen Research & Development, LLC; Levolta Pharmaceuticals, Inc.; Merrion Pharmaceuticals plc; Otsuka Pharmaceutical Co. Ltd.; Thar Pharmaceuticals, Inc.; and Transition Therapeutics Inc.

        Our commercial opportunities could be reduced or eliminated if our competitors develop and commercialize products that are safer, more effective, have fewer or less severe side effects, are more convenient or are less expensive than any products that we may develop. Our competitors also may obtain FDA or other regulatory approval for their products more rapidly than we may obtain approval for ours, which could result in our competitors establishing a strong market position before we are able to enter the market. In addition, our ability to compete may be affected in many cases by insurers or other third-party payors seeking to encourage the use of generic products. If our product candidates achieve marketing approval, we expect that they will be priced at a significant premium over competitive generic products, which would further impact our commercialization efforts.

        We are not aware of any generic products currently available on the market that are approved for the specific indications that we are pursuing; however, generic forms of the active ingredients of our product candidates, including zoledronic acid, DM, and bupropion, are available and could be used off-label. Any such off-label use could adversely affect our profitability and have a negative effect on our operating results and financial condition. For example, even though zoledronic acid is not currently approved for the treatment of pain, we would not be able to prevent a physician from prescribing zoledronic acid in intravenous form for such treatment.

        Many of the companies against which we are competing or against which we may compete in the future have significantly greater financial resources and expertise in research and development, manufacturing, preclinical testing, conducting clinical trials, obtaining regulatory approvals, and marketing approved products than we do. Mergers and acquisitions in the pharmaceutical and biotechnology industries may result in even more resources being concentrated among a smaller number of our competitors. Early stage companies may also prove to be significant competitors, particularly through collaborative arrangements with large and established companies. These third

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parties compete with us in recruiting and retaining qualified scientific and management personnel and establishing clinical trial sites and patient registration for clinical trials, as well as in acquiring technologies complementary to, or necessary for, our programs.

If the FDA or comparable foreign regulatory authorities approve generic or similar versions of any of our products that receive marketing approval, or such authorities do not grant our products appropriate periods of data exclusivity before approving generic or similar versions of our products, the sales of our products could be adversely affected.

        Once an NDA is approved, the covered product becomes a "reference listed drug" in the FDA's Orange Book. Manufacturers may seek approval of generic versions of reference listed drugs through submission of ANDAs in the United States. In support of an ANDA, a generic manufacturer need not conduct full clinical studies. Rather, the applicant generally must show that its product has the same active ingredient(s), dosage form, strength, route of administration, and conditions of use or labeling, among other commonalities, as the reference listed drug and that the generic version is bioequivalent to the reference listed drug, meaning it is absorbed in the body at the same rate and to the same extent. Generic products may be significantly less costly to bring to market than the reference listed drug and companies that produce generic products are generally able to offer them at lower prices, and are generally preferred by third-party payors. Thus, following the introduction of a generic drug, a significant percentage of the sales of any branded product or reference listed drug is typically lost to the generic product.

        Moreover, in addition to generic competition, we could face competition from other companies seeking approval of drug products that are similar to ours using the 505(b)(2) pathway. Such applicants may be able to rely on our product candidates, if approved, or other approved drug products or published literature to develop drug products that are similar to ours. The introduction of a drug product similar to our product candidates could expose us to increased competition.

        Further, if we do not file a patent infringement lawsuit against a generic manufacturer within 45 days of receiving notice of its paragraph IV certification, the ANDA or 505(b)(2) applicant would not be subject to a 30-month stay. Litigation or other proceedings to enforce or defend intellectual property rights are often very complex in nature, may be expensive and time consuming, may divert our management's attention from our core business, and may result in unfavorable results that could adversely impact our ability to prevent third parties from competing with our products. Accordingly, upon approval of our product candidates we may be subject to generic competition, competition from similar products, or may need to commence patent infringement proceedings, which would divert our resources.

        We currently anticipate that we may be eligible for three years of non-patent marketing exclusivity for our product candidates if they are approved. These three years, however, would only protect against modifications in formulation or approved uses in comparison to the reference listed drug and would not prevent other companies from submitting full NDAs. Moreover, a 505(b)(2) applicant could rely on a reference listed drug that is not one of our product candidates, or published literature, in which case any periods of patent or non-patent protection may not prevent FDA approval. We may also be eligible in the United States for seven years of orphan exclusivity for AXS-02 for the treatment of CRPS, which is further discussed below.

        Competition that our products may face from generic or similar versions of our products could materially and adversely impact our future revenue, profitability, and cash flows and substantially limit our ability to obtain a return on the investments we have made in those product candidates.

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AXS-02 has received Orphan Drug Designation from the FDA. However, there is no guarantee that we will be able to maintain this designation for AXS-02, receive this designation for any of our other product candidates, or receive or maintain any corresponding benefits, including periods of exclusivity.

        AXS-02 has received Orphan Drug Designation from the FDA for the treatment of CRPS. We may also seek Orphan Drug Designation for our other product candidates, as appropriate.

        Orphan Drug Designation, however, may be lost if the indication for which we develop AXS-02 or the indications for which we develop any of our future product candidates do not meet the orphan drug criteria. Moreover, following product approval, orphan drug exclusivity may be lost if the FDA determines, among other reasons, that the request for designation was materially defective or if the manufacturer is unable to assure sufficient quantity of the product to meet the needs of patients with the rare disease or condition. Even if we obtain orphan drug exclusivity for AXS-02, AXS-05, or any other of our current or future product candidates, that exclusivity may not effectively protect the product from competition because different products can be approved for the same condition. Even after an orphan product is approved, the FDA can subsequently approve a product containing the same principal molecular features for the same condition if the FDA concludes that the later product is clinically superior in that it is shown to be safer, more effective or makes a major contribution to patient care.

        The FDA or the EMA may grant orphan exclusivity to two different sponsors for the same compound or active molecule and for the same indication. For example, subsequent to our Orphan Drug Designation, the FDA granted Orphan Drug Designation to Thar Pharmaceuticals, Inc. for a zoledronic acid-containing product for the treatment of CRPS. If Thar Pharmaceuticals or another sponsor receives FDA approval for a zoledronic acid-containing product for the treatment of CRPS before we obtain FDA approval for AXS-02 for the treatment of pain associated with CRPS, we would be prevented from launching our product in the United States for this indication for a period of at least 7 years. If another sponsor receives EMA approval for a zoledronic acid-containing product for the treatment of CRPS before we obtain EMA approval for AXS-02 for the treatment of pain associated with CRPS, we would be prevented from launching our product in the European Union for this indication for a period of at least 10 to 12 years.

        In response to a recent court decision regarding the plain meaning of the exclusivity provision of the Orphan Drug Act, the FDA may undertake a reevaluation of aspects of its orphan drug regulations and policies. We do not know if, when, or how the FDA may change the orphan drug regulations and policies, and it is uncertain how any changes might affect our business. Depending on what changes the FDA may make to its orphan drug regulations and policies, our business, financial condition, results of operations, and prospects could be harmed.

If we are unable to establish effective marketing and sales, capabilities or enter into agreements with third parties to market and sell our product candidates, if they are approved, we may be unable to generate product revenues.

        We currently do not have a commercial infrastructure for the marketing, sale, and distribution of pharmaceutical products. If approved, in order to commercialize our products, we must build our marketing, sales, and distribution capabilities or make arrangements with third parties to perform these services. We may not be successful in doing so. If one of our product candidates is approved by the FDA, we plan to build a commercial infrastructure, including the creation of a specialty sales force to launch that product candidate throughout the United States. In the future, we may seek to further penetrate the U.S. market by expanding our sales force or through collaborations with other pharmaceutical or biotechnology companies or third-party manufacturing and sales organizations. If approved for marketing outside the United States, we intend to commercialize our product candidates outside the United States with a marketing and sales collaborator or collaborators, rather than with our own sales force.

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        We have no prior experience in the marketing, sale, and distribution of pharmaceutical products, and there are significant risks involved in the building and managing of a commercial infrastructure. The establishment and development of our own sales force and related compliance plans to market any products we may develop will be expensive and time consuming and could delay any product launch, and we may not be able to successfully develop this capability. We, or our future collaborators, will have to compete with other pharmaceutical and biotechnology companies to recruit, hire, train, manage, and retain marketing and sales personnel. In the event we are unable to develop a marketing and sales infrastructure, we may not be able to commercialize AXS-02, AXS-05, or any other of our current or future product candidates, which would limit our ability to generate product revenues. Factors that may inhibit our efforts to commercialize AXS-02, AXS-05, or any other of our current or future product candidates on our own include:

•

our inability to recruit, train, manage, and retain adequate numbers of effective sales and marketing personnel;



•

the inability of sales personnel to obtain access to physicians or persuade adequate numbers of physicians to prescribe AXS-02, AXS-05, or any other of our current or future product candidates;



•

our inability to effectively oversee a geographically dispersed sales and marketing team;



•

the costs associated with training sales and marketing personnel on legal and regulatory compliance matters and monitoring their actions;



•

an inability to secure adequate coverage and reimbursement by government and private health plans;



•

the clinical indications for which the product is approved;



•

limitations or warnings, including distribution or use restrictions, contained in the product's approved labeling;



•

any distribution and use restrictions imposed by the FDA or to which we agree as part of a mandatory REMS or voluntary risk management plan;



•

liability for sales or marketing personnel who fail to comply with the applicable legal and regulatory requirements;



•

the lack of complementary products to be offered by sales personnel, which may put us at a competitive disadvantage relative to companies with more extensive product lines; and



•

unforeseen costs and expenses associated with creating an independent sales and marketing organization or engaging a contract sales organization.

        Although our current plan is to hire most of our sales and marketing personnel only if a product candidate is approved by the FDA, we will incur expenses prior to product launch in recruiting this sales force and developing a marketing and sales infrastructure. If a commercial launch is delayed as a result of FDA requirements or other reasons, we would incur these expenses prior to being able to realize any revenue from sales of our product candidates. Even if we are able to effectively hire a sales force and develop a marketing and sales infrastructure, our sales force and marketing teams may not be successful in commercializing AXS-02, AXS-05, or any other of our current or future product candidates.

        In the event we are unable to collaborate with a third-party marketing and sales organization to commercialize any approved product candidates outside the United States, our ability to generate product revenues may be limited. To the extent we rely on third parties to commercialize any products for which we obtain regulatory approval, we may receive less revenues than if we commercialized these products ourselves. In addition, we would have less control over the sales efforts of any other third

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parties involved in our commercialization efforts, and could be held liable if they failed to comply with applicable legal or regulatory requirements.

If AXS-02 or AXS-05 does not achieve broad market acceptance, the revenues that we generate from their sales will be limited.

        We have never commercialized a product candidate for any indication. Even if AXS-02 or AXS-05 is approved by the appropriate regulatory authorities for marketing and sale, they may not gain acceptance among physicians, patients, third-party payors, and others in the medical community. If any product candidates for which we obtain regulatory approval do not gain an adequate level of market acceptance, we may not generate significant product revenues or become profitable. Market acceptance of AXS-02 or AXS-05 by the medical community, patients, and third-party payors will depend on a number of factors, some of which are beyond our control. For example, physicians are often reluctant to switch their patients from existing therapies even when new and potentially more effective or convenient treatments enter the market. Further, patients often acclimate to the therapy that they are currently taking and do not want to switch unless their physicians recommend switching products or they are required to switch therapies due to lack of reimbursement for existing therapies.

        Efforts to educate the medical community and third-party payors on the benefits of our product candidates may require significant resources and may not be successful. If any of our product candidates is approved but does not achieve an adequate level of market acceptance, we may not generate significant revenues and we may not become profitable. The degree of market acceptance of any of our product candidates, and in particular AXS-02 and AXS-05, will depend on a number of factors, including:

•

the efficacy of our product candidates;



•

the prevalence and severity of adverse events associated with such product candidate;



•

the clinical indications for which the product is approved and the approved claims that we may make for the product;



•

limitations or warnings contained in the product's FDA-approved labeling, including potential limitations or warnings for such product candidate, that may be more restrictive than other competitive products;



•

changes in the standard of care for the targeted indications for such product candidate, which could reduce the marketing impact of any claims that we could make following FDA approval, if obtained;



•

the relative convenience and ease of administration of such product candidate;



•

cost of treatment versus economic and clinical benefit in relation to alternative treatments or therapies;



•

the availability of adequate coverage or reimbursement by third parties, such as insurance companies and other healthcare payors, and by government healthcare programs, including Medicare and Medicaid;



•

the extent and strength of our marketing and distribution of such product candidate;



•

the safety, efficacy, and other potential advantages over, and availability of, alternative treatments already used or that may later be approved for any of our intended indications;



•

distribution and use restrictions imposed by the FDA with respect to such product candidate or to which we agree as part of a mandatory risk evaluation and mitigation strategy or voluntary risk management plan;



•

the timing of market introduction of such product candidate, as well as competitive products;

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•

our ability to offer such product candidate for sale at competitive prices, including prices that are competitive with generic products;



•

the willingness of the target patient population to try new therapies and of physicians to prescribe these therapies;



•

the clinical indications for which such product candidate is approved;



•

the extent and strength of our third-party manufacturer and supplier support;



•

the approval of other new products for the same indications;



•

adverse publicity about the product or favorable publicity about competitive products; and



•

potential product liability claims.

        Our efforts to educate the medical community and third-party payors on the benefits of our product candidates may require significant resources and may never be successful. Even if the medical community accepts that one of our product candidates is safe and effective for its approved indications, physicians and patients may not immediately be receptive to such product candidate and may be slow to adopt it as an accepted treatment of the approved indication. It is unlikely that any labeling approved by the FDA will contain claims that one of our product candidates is safer or more effective than competitive products or will permit us to promote such product candidate as being superior to competing products. Further, the availability of inexpensive generic forms of pain management products for acute pain may also limit acceptance of certain of our product candidates among physicians, patients, and third-party payors. If AXS-02, AXS-05, or any other of our current or future product candidates is approved but does not achieve an adequate level of acceptance among physicians, patients, and third-party payors, we may not generate meaningful revenues from our product candidates, and we may not become profitable.

        The ability of patients to purchase certain of the active ingredients of our product candidates in generic form could put us at a competitive disadvantage. For example, in some foreign jurisdictions, generic oral forms of DM and bupropion are currently available individually for consumer purchase. In addition, physicians may prescribe generic zoledronic acid for the treatment of pain off-label. Any use of these generic forms of the active molecules of our product candidates could adversely affect our business and our results of operations.

        The potential market opportunities for our product candidates are difficult to precisely estimate. Our estimates of the potential market opportunities are predicated on many assumptions including industry knowledge and publications, third-party research reports, and other surveys. While we believe that our internal assumptions are reasonable, these assumptions involve the exercise of significant judgment on the part of our management, are inherently uncertain, and the reasonableness of these assumptions has not been assessed by an independent source. If any of the assumptions proves to be inaccurate, the actual markets for our product candidates could be smaller than our estimates of the potential market opportunities.

We face potential product liability exposure, and if successful claims are brought against us, we may incur substantial liability for AXS-02, AXS-05, or any other of our current or future product candidates and may have to limit their commercialization.

        The use of AXS-02, AXS-05, or any other of our current or future product candidates in clinical trials, and the sale of any of our product candidates for which we obtain regulatory approval, exposes us to the risk of product liability claims. We face inherent risk of product liability related to the testing of our product candidates in human clinical trials and will face an even greater risk if we commercially sell any product candidates that we may develop. For example, we may be sued if any product candidate we develop allegedly causes injury or is found to be otherwise unsuitable during clinical testing, manufacturing, marketing or sale. Any such product liability claims may include allegations of

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defects in manufacturing, defects in design, a failure to warn of dangers inherent in the product, negligence, strict liability or a breach of warranties. Claims could also be asserted under state consumer protection acts. Product liability claims might be brought against us by consumers, healthcare providers or others using, administering or selling our products. If we cannot successfully defend ourselves against these claims, we will incur substantial liabilities or be required to limit commercialization of our product candidates. Even successful defense would require significant financial and management resources. Regardless of merit or eventual outcome, liability claims may result in:

•

loss of revenue from decreased demand for our products and/or product candidates;



•

impairment of our business reputation or financial stability;



•

costs of related litigation;



•

substantial monetary awards to patients or other claimants;



•

diversion of management attention;



•

loss of revenues;



•

withdrawal of clinical trial participants and potential termination of clinical trial sites or entire clinical programs;



•

the inability to commercialize our product candidates;



•

significant negative media attention;



•

decrease in our stock price;



•

initiation of investigations and enforcement actions by regulators; and



•

product recalls, withdrawals or labeling, marketing or promotional restrictions.

        We have obtained limited product liability insurance coverage for our products and our clinical trials with a $8 million annual aggregate coverage limit. However, our insurance coverage may not reimburse us or may not be sufficient to reimburse us for any expenses or losses we may suffer. Moreover, insurance coverage is becoming increasingly expensive, and, in the future, we may not be able to maintain insurance coverage at a reasonable cost or in sufficient amounts to protect us against losses due to liability. We intend to expand our insurance coverage to include the sale of commercial products if we obtain FDA approval for our product candidates in development, but we may be unable to obtain commercially reasonable product liability insurance for any products approved for marketing, or at all. On occasion, large judgments have been awarded in class action lawsuits based on drugs that had unanticipated side effects. A successful product liability claim or series of claims brought against us could cause our stock price to fall and, if judgments exceed our insurance coverage, could decrease our cash and adversely affect our business and our prospects.

RISKS RELATED TO OUR DEPENDENCE ON THIRD PARTIES

We rely, and expect to continue to rely, on third parties to conduct, supervise, and monitor our preclinical studies and clinical trials, and those third parties may not perform satisfactorily, including failing to meet deadlines for the completion of such trials or failing to comply with regulatory requirements.

        We rely on third-party CROs to conduct, supervise, and monitor our preclinical and clinical trials for our product candidates, including AXS-02 and AXS-05, and do not currently plan to independently conduct clinical or preclinical trials of any other potential product candidates. We expect to continue to rely on third parties, such as CROs, clinical data management organizations, medical institutions, and clinical investigators, to conduct our preclinical studies and clinical trials. While we have agreements governing their activities, we have limited influence over their actual performance and control only certain aspects of their activities. The failure of these third parties to successfully carry out their

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contractual duties or meet expected deadlines could substantially harm our business because we may not obtain marketing approval for or commercialize our product candidates in a timely manner or at all. Moreover, these agreements might terminate for a variety of reasons, including a failure to perform by the third parties. If we need to enter into alternative arrangements, that would delay our product development activities and adversely affect our business.

        Our reliance on these third parties for development activities will reduce our control over these activities. Nevertheless, we are responsible for ensuring that each of our studies is conducted in accordance with the applicable protocol, legal, regulatory, and scientific standards and our reliance on the CROs does not relieve us of our regulatory responsibilities. For example, we will remain responsible for ensuring that each of our clinical trials is conducted in accordance with the general investigational plan and protocols for the trial and for ensuring that our preclinical trials are conducted in accordance with good laboratory practice, or GLP, as appropriate. Moreover, the FDA and comparable foreign regulatory authorities require us to comply with standards, commonly referred to as good clinical practices, or GCPs, for conducting, recording, and reporting the results of clinical trials to assure that data and reported results are credible and accurate and that the rights, integrity, and confidentiality of trial participants are protected. Regulatory authorities enforce these requirements through periodic inspections of trial sponsors, clinical investigators, and trial sites. If we or any of our CROs fail to comply with applicable GCPs, we or our CROs may be subject to enforcement or other legal actions, the clinical data generated in our clinical trials may be deemed unreliable and the FDA or comparable foreign regulatory authorities may require us to perform additional clinical trials.

        In addition, once we have an approved product, we will be required to report certain financial interests of our third-party investigators if these relationships exceed certain financial thresholds or meet other criteria. The FDA or comparable foreign regulatory authorities may question the integrity of the data from those clinical trials conducted by investigators who previously served or currently serve as scientific advisors or consultants to us from time to time and receive cash compensation in connection with such services or otherwise receive compensation from us that could be deemed to impact study outcome, proprietary interests in a product candidate, certain company equity interests, or significant payments of other sorts.

        We cannot assure you that upon inspection by a given regulatory authority, such regulatory authority will determine that any of our clinical trials complies with GCP regulations. In addition, our clinical trials must be conducted with product candidates that were produced under cGMP regulations. Our failure to comply with these regulations may require us to repeat clinical trials, which would delay the regulatory approval process. We also are required to register certain clinical trials and post the results of certain completed clinical trials on a government-sponsored database, ClinicalTrials.gov, within specified timeframes. Failure to do so can result in enforcement actions and adverse publicity.

        Our CROs may also have relationships with other entities, some of which may be our competitors, for whom they may also be conducting clinical trials or other drug development activities that could harm our competitive position. In addition, our CROs are not our employees, and except for remedies available to us under our agreements with such CROs, we cannot control whether or not they devote sufficient time and resources to our ongoing clinical, non-clinical, and preclinical programs. If these third parties do not successfully carry out their contractual duties, meet expected deadlines or conduct our preclinical studies or clinical trials in accordance with regulatory requirements or our stated protocols, if they need to be replaced or if the quality or accuracy of the clinical data they obtain is compromised due to the failure to adhere to our clinical protocols, regulatory requirements or for other reasons, our clinical trials may be extended, delayed, or terminated and we may not be able to obtain, or may be delayed in obtaining, marketing approvals for our product candidates and will not be able to, or may be delayed in our efforts to, successfully commercialize our product candidates, or we or they may be subject to regulatory enforcement actions. As a result, our results of operations and the commercial prospects for our product candidates would be harmed, our costs could increase and our ability to generate revenues could be delayed. To the extent we are unable to successfully identify and

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manage the performance of third-party service providers in the future, our business may be materially and adversely affected.

        If any of our relationships with these third-party CROs terminate, we may not be able to enter into arrangements with alternative CROs or to do so on commercially reasonable terms. Switching or adding additional CROs involves additional cost and requires management time and focus. In addition, there is a natural transition period when a new CRO commences work. As a result, delays could occur, which could compromise our ability to meet our desired development timelines. Though we carefully manage our relationships with our CROs, there can be no assurance that we will not encounter similar challenges or delays in the future or that these delays or challenges will not have a material adverse impact on our business, financial condition and prospects, and results of operations.

If the manufacturers upon whom we rely fail to produce our product candidates in the volumes that we require on a timely basis, or to comply with stringent regulations applicable to pharmaceutical drug manufacturers, we may face delays in the development and commercialization of, or be unable to meet demand for, our products and may lose potential revenues.

        We do not manufacture any of our product candidates, and we do not currently plan to develop any capacity to do so. We currently outsource all manufacturing of our product candidates to third parties typically without any guarantee that there will be sufficient supplies to fulfill our requirements or that we may obtain such supplies on acceptable terms. Any delays in obtaining adequate supplies with respect to our product candidates may delay the development or commercialization of our product candidates. Moreover, we do not yet have agreements established regarding commercial supply of our product candidates, and we may not be able to establish or maintain commercial manufacturing arrangements on commercially reasonable terms for AXS-02, AXS-05, or any other of our current or future product candidates for which we obtain approval in the future.

        We may not succeed in our efforts to establish manufacturing relationships or other alternative arrangements for any of our existing or future product candidates and programs. Our product candidates may compete with other products and product candidates for access to manufacturing facilities. There are a limited number of manufacturers that operate under cGMP regulations and that are both capable of manufacturing for us and willing to do so. If our existing third-party manufacturers, or the third parties that we engage in the future to manufacture a product for commercial sale or for our clinical trials, should cease to continue to do so for any reason, we likely would experience delays in obtaining sufficient quantities of our product candidates for us to meet commercial demand or to advance our clinical trials while we identify and qualify replacement suppliers. If for any reason we are unable to obtain adequate supplies of our product candidates or the drug substances used to manufacture them, it will be more difficult for us to develop our product candidates and compete effectively. Further, even if we do establish such collaborations or arrangements, our third-party manufacturers may breach, terminate, or not renew these agreements.

        Any problems or delays we experience in preparing for commercial-scale manufacturing of a product candidate may result in a delay in FDA approval of the product candidate or may impair our ability to manufacture commercial quantities or such quantities at an acceptable cost, which could result in the delay, prevention, or impairment of clinical development and commercialization of our product candidates and could adversely affect our business. For example, our manufacturers will need to produce specific batches of our product candidates to demonstrate acceptable stability under various conditions and for commercially viable lengths of time. We and our contract manufacturers will need to demonstrate to the FDA and other regulatory authorities that this is acceptable stability data for our product candidates, as well as validate methods and manufacturing processes, in order to receive regulatory approval to commercialize AXS-02, AXS-05, or any of our other current or future product candidates. Furthermore, if our commercial manufacturers fail to deliver the required commercial quantities of bulk drug substance or finished product on a timely basis and at commercially reasonable

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prices, we would likely be unable to meet demand for our products and we would lose potential revenues.

        We only have one contract manufacturer for each of AXS-02 and AXS-05 for use in our clinical trials. In addition, we do not have any long-term commitments from our suppliers of clinical trial material or guaranteed prices for our product candidates. The manufacture of pharmaceutical products requires significant expertise and capital investment, including the development of advanced manufacturing techniques and process controls. Manufacturers of pharmaceutical products often encounter difficulties in production, particularly in scaling up initial production. These problems include difficulties with production costs and yields, quality control, including stability of the product candidate and quality assurance testing, shortages of qualified personnel, and compliance with strictly enforced federal, state, and foreign regulations. Our manufacturers may not perform as agreed. If our manufacturers were to encounter any of these difficulties, our ability to provide product candidates to patients in our clinical trials and for commercial use, if approved, would be jeopardized.

        In addition, all manufacturers of our product candidates must comply with cGMP requirements enforced by the FDA that are applicable to both finished drug products and active pharmaceutical ingredients used both for clinical and commercial supply, through its facilities inspection program. Our manufacturers must be approved by the FDA pursuant to inspections that will be conducted after we submit our marketing applications to the agency. The cGMP requirements include quality control, quality assurance, and the maintenance of records and documentation. Manufacturers of our product candidates may be unable to comply with our specifications, these cGMP requirements and with other FDA, state, and foreign regulatory requirements. If our contract manufacturers cannot successfully manufacture material that conforms to our specifications and the strict regulatory requirements of the FDA or other regulatory authorities, they will not be able to secure or maintain regulatory approval for their manufacturing facilities. While we are ultimately responsible for the manufacture of our product candidates, other than through our contractual arrangements, we have little control over our manufacturers' compliance with these regulations and standards. If the FDA or a comparable foreign regulatory authority does not approve these facilities for the manufacture of our product candidates or if it withdraws any such approval in the future, we may need to find alternative manufacturing facilities, which would significantly impact our ability to develop, obtain regulatory approval for or market our product candidates, if approved. A failure to comply with these requirements may result in regulatory enforcement actions against our manufacturers or us, including fines and civil and criminal penalties, including imprisonment, suspension or restrictions of production, suspension, delay or denial of product approval or supplements to approved products, clinical holds or termination of clinical studies, warning or untitled letters, regulatory authority communications warning the public about safety issues with the drug, refusal to permit the import or export of the products, product seizure, detention, or recall, suits under the civil False Claims Act, corporate integrity agreements, consent decrees, or withdrawal of product approval. If the safety of any quantities supplied is compromised due to our manufacturers' failure to adhere to applicable laws or for other reasons, we may not be able to obtain regulatory approval for or successfully commercialize our product candidates.

        Any failure or refusal to supply our product candidates or components for our current or future product candidates that we may develop could delay, prevent or impair our clinical development or commercialization efforts. Any change in our manufacturers could be costly because the commercial terms of any new arrangement could be less favorable and because the expenses relating to the transfer of necessary technology and processes could be significant.

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We may rely on third parties to perform many essential services for any products that we commercialize, including services related to warehousing and inventory control, distribution, government price reporting, customer service, accounts receivable management, cash collection, and adverse event reporting. If these third parties fail to perform as expected or to comply with legal and regulatory requirements, our ability to commercialize AXS-02, AXS-05, or any other of our current or future product candidates will be significantly impacted and we may be subject to regulatory sanctions.

        We may retain third-party service providers to perform a variety of functions related to the sale and distribution of AXS-02, AXS-05, or any other of our current or future product candidates, key aspects of which will be out of our direct control. These service providers may provide key services related to warehousing and inventory control, distribution, government price reporting, customer service, accounts receivable management, and cash collection, and, as a result, most of our inventory may be stored at a single warehouse maintained by one such service provider. If we retain a service provider, we would substantially rely on it as well as other third-party providers that perform services for us, including entrusting our inventories of products to their care and handling. If these third-party service providers fail to comply with applicable laws and regulations, fail to meet expected deadlines, or otherwise do not carry out their contractual duties to us, or encounter physical or natural damage at their facilities, our ability to deliver product to meet commercial demand would be significantly impaired and we may be subject to regulatory enforcement action.

        In addition, we may engage third parties to perform various other services for us relating to adverse event reporting, safety database management, fulfillment of requests for medical information regarding our product candidates and related services. If the quality or accuracy of the data maintained by these service providers is insufficient, or these third parties otherwise fail to comply with regulatory requirements related to adverse event reporting, we could be subject to regulatory sanctions.

        Additionally, if a third party errs in calculating government pricing information from transactional data in our financial records, it could impact our discount and rebate liability.

Any collaboration arrangements that we are a party to or may enter into in the future may not be successful, which could adversely affect our ability to develop and commercialize our product candidates.

        Our business model is to commercialize our product candidates in the United States and generally to seek future collaboration arrangements with pharmaceutical or biotechnology companies for the development or commercialization of our product candidates in the rest of the world. We currently have not entered into any sub-license agreements. Our future collaboration arrangements may not be successful, and the success of them will depend heavily on the efforts and activities of our collaborators. Collaborators generally have significant discretion in determining the efforts and resources that they will apply to these collaboration arrangements. Disagreements between parties to a collaboration arrangement regarding clinical development and commercialization matters can lead to delays in the development process or commercializing the applicable product candidate and, in some cases, termination of the collaboration arrangement. These disagreements can be difficult to resolve if neither of the parties has final decision making authority.

        We may license the right to market and sell our product candidates under our collaborators' labeler codes. Alternatively, we may enter into agreements with collaborators to market and sell our product candidates under our own labeler code, in which case errors and omissions by collaborators in capturing and transmitting transactional data may impact the accuracy of our government price reporting.

        Collaborations with pharmaceutical companies and other third parties often are terminated or allowed to expire by the other party. Any such termination or expiration would adversely affect us

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financially and could harm our business reputation. Any future collaborations we might enter into may pose a number of risks, including the following:

•

collaborators may not perform their obligations as expected;



•

collaborators may not pursue development and commercialization of any product candidates that achieve regulatory approval or may elect not to continue or renew development or commercialization programs based on clinical trial results, changes in the collaborators' strategic focus or available funding, or external factors, such as an acquisition, that divert resources or create competing priorities;



•

collaborators may delay clinical trials, provide insufficient funding for a clinical trial program, stop a clinical trial or abandon a product candidate, repeat or conduct new clinical trials or require a new formulation of a product candidate for clinical testing;



•

collaborators could fail to make timely regulatory submissions for a product candidate;



•

collaborators may not comply with all applicable regulatory requirements or may fail to report safety data in accordance with all applicable regulatory requirements;



•

collaborators could independently develop, or develop with third parties, products that compete directly or indirectly with our products or product candidates if the collaborators believe that competitive products are more likely to be successfully developed or can be commercialized under terms that are more economically attractive than ours;



•

product candidates discovered in collaboration with us may be viewed by our collaborators as competitive with their own product candidates or products, which may cause collaborators to cease to devote resources to the commercialization of our product candidates;



•

a collaborator with marketing and distribution rights to one or more of our product candidates that achieve regulatory approval may not commit sufficient resources to the marketing and distribution of such product candidate or product;



•

disagreements with collaborators, including disagreements over proprietary rights, contract interpretation or the preferred course of development, might cause delays or termination of the research, development or commercialization of product candidates, might lead to additional responsibilities for us with respect to product candidates, or might result in litigation or arbitration, any of which would be time consuming and expensive;



•

collaborators may not properly maintain or defend our intellectual property rights or may use our proprietary information in such a way as to invite litigation that could jeopardize or invalidate our intellectual property or proprietary information or expose us to potential litigation; and



•

collaborators may infringe the intellectual property rights of third parties, which may expose us to litigation and potential liability.

        If any collaborations we might enter into in the future do not result in the successful development and commercialization of products or if one of our collaborators subsequently terminates its agreement with us, we may not receive any future research funding or milestone or royalty payments under the collaboration. If we do not receive the funding we expect under the agreements, our development of our product candidates could be delayed and we may need additional resources to develop our product candidates and our product platform.

        Additionally, if any future collaborator of ours is involved in a business combination, the collaborator might deemphasize or terminate development or commercialization of any product candidate licensed to it by us. If one of our collaborators terminates its agreement with us, we may find it more difficult to attract new collaborators and our reputation in the business and financial communities could be adversely affected.

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        For AXS-02, AXS-05, and any other current or future product candidates, we may in the future determine to collaborate with additional pharmaceutical and biotechnology companies for their development and potential commercialization. We face significant competition in seeking appropriate collaborators. Our ability to reach a definitive agreement for collaboration will depend, among other things, upon our assessment of the collaborator's resources and expertise, the terms and conditions of the proposed collaboration and the proposed collaborator's evaluation of a number of factors. If we are unable to reach agreements with suitable collaborators on a timely basis, on acceptable terms, or at all, we may have to curtail the development of a product candidate, reduce or delay its development program or one or more of our other development programs, delay its potential commercialization or reduce the scope of any sales or marketing activities, or increase our expenditures and undertake development or commercialization activities at our own expense. If we elect to fund and undertake development or commercialization activities on our own, we may need to obtain additional expertise and additional capital, which may not be available to us on acceptable terms, or at all. If we fail to enter into collaborations and do not have sufficient funds or expertise to undertake the necessary development and commercialization activities, we may not be able to further develop our product candidates or bring them to market or continue to develop our product platform and our business may be materially and adversely affected.

We are dependent on third parties to decide to utilize AXS-02 and AXS-05 to make them readily available at the point of care throughout their networks of pharmacies.

        In addition to extensive internal efforts, the successful commercialization of AXS-02 and AXS-05 will require many third parties, over whom we have no control, to decide to utilize AXS-02 and AXS-05, and to make them readily available at the point of care throughout their networks of pharmacies. These third parties include HMOs, long term care facilities, and pharmacy benefit managers, or PBMs, which use pharmacy and therapeutics committees, commonly referred to as P&T committees, to make purchasing and reimbursement decisions. Generally, before an HMO or long-term care facility will acquire AXS-02 or AXS-05 for its own pharmacies, or a PBM will pay retail network pharmacies on behalf of its health plans, AXS-02 and AXS-05 must be approved for addition to that organization's list of approved drugs, or formulary list, by the organization's P&T committee. An institutional P&T committee typically governs all matters pertaining to the use of medications within the institution, including review of medication formulary data and recommendations for the appropriate use of drugs within the institution to the medical staff. PBM P&T committees develop the criteria for plan beneficiaries to access prescription medication, including such cost control measures as step therapy and prior authorization. The frequency of P&T committee meetings varies considerably, and P&T committees often require additional information to aid in their decision-making process, so we may experience substantial delays in obtaining formulary approvals. Additionally, P&T committees may be concerned that the cost of acquiring AXS-02 or AXS-05 for use in their institutions or reimbursing retail pharmacies outweighs clinical benefits and will resist efforts to add AXS-02 or AXS-05 to the formulary, or implement restrictions on the usage of the drug in order to control costs. We cannot guarantee that we will be successful in getting the approvals we need from enough P&T committees quickly enough to maintain and grow sales of AXS-02 or AXS-05.

We are dependent upon our license agreements with an entity owned by our Chief Executive Officer and Chairman of the Board related to the development of our current product candidates, and if the agreements are terminated for any reason our business will be materially harmed.

        In 2012, we entered into three exclusive license agreements with Antecip Bioventures II LLC, or Antecip, an entity owned by our Chief Executive Officer and Chairman of the Board, Herriot Tabuteau, M.D., in which we were granted exclusive licenses to develop, manufacture, and commercialize Antecip's patents and applications related to the development of AXS-02 and AXS-05, as well as AXS-04, a product candidate that is currently in early stage development, anywhere in the

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world for veterinary and human therapeutic and diagnostic use. Pursuant to the agreements, we are required to use commercially reasonable efforts to develop, obtain regulatory approval for, and commercialize AXS-02, AXS-05, and AXS-04. Under the terms of the agreements, we are required to pay to Antecip a royalty equal to 4.5% for AXS-02, 3.0% for AXS-05, and 1.5% for AXS-04, of net sales of products containing the licensed technology by us, our affiliates, or permitted sublicensees. These royalty payments are subject to reduction by an amount up to 50.0% of any required payments to third parties. Unless earlier terminated by a party for cause or by us for convenience, the agreements remain in effect on a product-by-product and country-by-country basis until the later to occur of (1) the applicable product is no longer covered by a valid claim in that country or (2) 10 years from the first commercial sale of the applicable product in that country. Upon expiration of the agreements with respect to a product in a country, our license grant for that product in that country will become a fully paid-up, royalty-free, perpetual non-exclusive license. If Antecip terminates any of the agreements for cause, or if we exercise our right to terminate any of the agreements for convenience, the rights granted to us under such terminated agreement will revert to Antecip. To date, we have not been required to make any payments to Antecip under any of the license agreements. If any of the license agreements with Antecip are terminated for any reason, our business, financial condition, results of operations, and prospects will be materially harmed.

RISKS RELATED TO INTELLECTUAL PROPERTY

It is difficult and costly to protect our proprietary rights and as a result we may not be able to ensure their protection. In addition, patents have a limited lifespan and will eventually expire.

        Market exclusivity awarded by the FDA upon the approval of an NDA is limited in scope and duration. Our commercial success will depend in part on obtaining, maintaining, enforcing, and defending against third-party challenges, our patent and trade secret protection for AXS-02, AXS-05, and any other of our current and future product candidates that we may develop, license, or acquire, and the related manufacturing methods. We will only be able to fully protect our technologies from unauthorized use by third parties to the extent that valid and enforceable patents or trade secrets cover them.

        The patent prosecution process is expensive and time consuming, and we may not be able to file and prosecute all necessary or desirable patent applications at a reasonable cost or in a timely manner. It is also possible that we will fail to identify patentable aspects of our research and development output before it is too late to obtain patent protection. Moreover, should we enter into additional collaborations we may be required to consult with or cede control to collaborators regarding the prosecution, maintenance, and enforcement of our patents. Therefore, these patents and applications may not be prosecuted and enforced in a manner consistent with the best interests of our business. The patent positions of pharmaceutical and biotechnology companies can be highly uncertain and involve complex legal and factual questions for which important legal principles remain unresolved. No consistent policy regarding the breadth of claims allowed in pharmaceutical or biotechnology patents has emerged to date in the United States. The patent situation outside the United States is even more uncertain. Changes in either the patent laws or in interpretations of patent laws in the United States and other countries may diminish the value of our intellectual property. Accordingly, we cannot predict the breadth of claims that may be allowed or enforced in our patents or in third-party patents. The degree of future protection for our proprietary rights is uncertain because legal means afford only limited protection and may not adequately protect our rights or permit us to gain or keep our competitive advantage. Moreover, the patent application process is also subject to numerous risks and uncertainties, and there can be no assurance that we or any of our future development partners will be

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successful in protecting AXS-02, AXS-05, or any other of our current or future product candidates that we may develop, license or acquire by obtaining and defending patents. For example:

•

we may not have been the first to make the inventions covered by each of our pending patent applications and issued patents;



•

we may not have been the first to file patent applications for these inventions;



•

others may independently develop similar or alternative technologies or duplicate any of our product candidates or technologies;



•

it is possible that none of the pending patent applications will result in issued patents;



•

the issued patents may not cover commercially viable active products, may not provide us with any competitive advantages, or may be successfully challenged by third parties;



•

we may not develop additional proprietary technologies that are patentable;



•

patents of others may have an adverse effect on our business;



•

noncompliance with governmental patent agencies requirements can result in abandonment or lapse of a patent or patent application, resulting in partial or complete loss of patent rights in the relevant jurisdiction, potentially allowing competitors to enter the market earlier than would otherwise have been the case;



•

our competitors, many of whom have substantially greater resources than we do and many of whom have made significant investments in competing technologies, may seek or may have already obtained patents that will limit, interfere with, or eliminate our ability to make, use, and sell our potential product candidates; or



•

there may be significant pressure on the U.S. government and international governmental bodies to limit the scope of available patent protection both inside and outside the United States for disease treatments that prove successful, as a matter of public policy regarding worldwide health concerns.

        Patents have a limited lifespan. In most countries, including the United States, the expiration of a patent is typically 20 years from the date that the application for the patent is filed. Various extensions of patent term may be available in particular countries; however, in all circumstances the life of a patent, and the protection it affords, has a limited term. If we encounter delays in obtaining regulatory approvals, the period of time during which we could market a product under patent protection could be reduced. We expect to seek extensions of patent terms where these are available in any countries where we are prosecuting patents. Such possible extensions include those permitted under the Drug Price Competition and Patent Term Restoration Act of 1984 in the United States, which permits a patent term extension of up to five years to cover an FDA-approved product. The actual length of the extension will depend on the amount of patent term lost while the product was in clinical trials. However, the applicable authorities, including the USPTO and the FDA in the United States, and any equivalent regulatory authority in other countries, may not agree with our assessment of whether such extensions are available, and may refuse to grant extensions to our patents, or may grant more limited extensions than we request. If this occurs, our competitors may be able to take advantage of our investment in development and clinical trials by referencing our clinical and preclinical data, and then may be able to launch their product earlier than might otherwise be the case.

Recent patent reform legislation could increase the uncertainties and costs surrounding the prosecution of our patent applications and the enforcement or defense of our issued patents.

        On September 16, 2011, the Leahy-Smith America Invents Act, or the Leahy-Smith Act, was signed into law. The Leahy-Smith Act includes a number of significant changes to United States patent

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law. These include provisions that affect the way patent applications are prosecuted and may also affect patent litigation. The United States Patent Office recently developed new regulations and procedures to govern administration of the Leahy-Smith Act, and many of the substantive changes to patent law associated with the Leahy-Smith Act, and in particular, the first to file provisions, only became effective on March 16, 2013. Accordingly, it is not clear what, if any, impact the Leahy-Smith Act will have on the operation of our business. However, the Leahy-Smith Act and its implementation could increase the uncertainties and costs surrounding the prosecution of our patent applications and the enforcement or defense of our issued patents, all of which could have a material adverse effect on our business, financial condition, results of operations, and prospects.

        Patent applications in the United States are maintained in confidence for at least 18 months after their earliest effective filing date. Consequently, we cannot be certain we were the first to invent or the first to file patent applications on AXS-02, AXS-05, or any other of our current or future product candidates that we may develop, license or acquire. In the event that a third party has also filed a U.S. patent application relating to our product candidates or a similar invention, we may have to participate in interference proceedings declared by the U.S. Patent and Trademark Office to determine priority of invention in the United States. The costs of these proceedings could be substantial and it is possible that our efforts would be unsuccessful, resulting in a material adverse effect on our U.S. patent position. The results of these types of proceedings may reduce the scope of, or invalidate, our patent rights, allow third parties to commercialize our technology or products and compete directly with us, without payment to us, or result in our inability to manufacture or commercialize products without infringing third-party patent rights. In addition, if the breadth or strength of protection provided by our patents and patent applications is threatened, it could dissuade companies from collaborating with us to license, develop or commercialize current or future product candidates. Such results could have a material adverse effect on our business, financial condition, results of operations, and prospects.

        In addition, the patentability of claims in pending patent applications covering AXS-02, AXS-05, or any other of our current or future product candidates can be challenged by third parties during prosecution in the U.S. Patent and Trademark Office, for example by third-party observations and derivation proceedings, and the validity of claims in issued patents can be challenged by third parties in various post-grant proceedings such as post-grant review, reexamination, and inter-partes review proceedings.

        Furthermore, we may not have identified all United States and foreign patents or published applications that affect our business either by blocking our ability to commercialize our drugs or by covering similar technologies that affect our drug market. In addition, some countries, including many in Europe, do not grant patent claims directed to methods of treating humans, and in these countries patent protection may not be available at all to protect our product candidates. Even if patents issue, we cannot guarantee that the claims of those patents will be valid and enforceable or provide us with any significant protection against competitive products, or otherwise be commercially valuable to us.

        We also rely on trade secrets to protect our technology, particularly where we do not believe patent protection is appropriate or obtainable. However, trade secrets are difficult to protect. While we use reasonable efforts to protect our trade secrets, our licensors, employees, consultants, contractors, outside scientific collaborators, and other advisors may unintentionally or willfully disclose our information to competitors. Enforcing a claim that a third party illegally obtained and is using our trade secrets is expensive and time consuming, and the outcome is unpredictable. In addition, courts outside the United States are sometimes less willing to protect trade secrets. Moreover, our competitors may independently develop equivalent knowledge, methods, and know-how.

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Obtaining and maintaining our patent protection depends on compliance with various procedural, documentary, fee payment, and other requirements imposed by governmental patent agencies, and our patent protection could be reduced or eliminated for noncompliance with these requirements.

        The USPTO and various foreign governmental patent agencies require compliance with a number of procedural, documentary, fee payment, and other similar provisions during the patent prosecution process. Periodic maintenance fees, renewal fees, annuity fees, and various other governmental fees on patents or patent applications will be due to be paid to the USPTO and various patent agencies outside of the United States in several stages over the lifetime of the patents and applications. We have systems in place to remind us to pay these fees, and we employ and rely on reputable law firms and other professionals to effect payment of these fees to the USPTO and non-U.S. patent agencies for the patents and patent applications we own and those that we in-license. We also employ reputable law firms and other professionals to help us comply with the various documentary and other procedural requirements with respect to the patents and patent applications that we own and those that we in-license. In some cases, an inadvertent lapse can be cured by payment of a late fee or by other means in accordance with the applicable rules. However, there are situations in which noncompliance can result in abandonment or lapse of the patent or patent application, resulting in partial or complete loss of patent rights in the relevant jurisdiction. In such an event, our competitors might be able to enter the market and this circumstance would have a material adverse effect on our business.

If we or any future collaboration partner are sued for infringing intellectual property rights of third parties, it will be costly and time consuming, and an unfavorable outcome in any litigation would harm our business.

        Our ability to develop, manufacture, market, and sell AXS-02, AXS-05, and any other of our current and future product candidates depends upon our ability to avoid infringing the proprietary rights of third parties, and our commercial success depends upon our ability, and the ability of our collaborators, to develop, manufacture, market, and sell our product candidates and use our proprietary technologies without infringing the proprietary rights of third parties. There is considerable intellectual property litigation in the biotechnology and pharmaceutical industries. Numerous U.S. and foreign issued patents and pending patent applications, which are owned by third parties, exist in the general field of treatment and management of pain and other CNS disorders and cover the use of numerous compounds and formulations in our targeted markets. Third parties may assert infringement claims against us based on existing patents or patents that may be granted in the future. Because of the uncertainty inherent in any patent or other litigation involving proprietary rights, we and our licensors may not be successful in defending intellectual property claims by third parties, which could have a material adverse effect on our business, financial condition, results of operations, and prospects. Regardless of the outcome of any litigation, defending the litigation may be expensive, time consuming, and distracting to management. In addition, because patent applications can take many years to issue, there may be currently pending applications, unknown to us, which may later result in issued patents that AXS-02, AXS-05, or any other of our current or future product candidates may infringe. There could also be existing patents of which we are not aware that AXS-02, AXS-05, or any other of our current or future product candidates may inadvertently infringe.

        If a third party claims that we infringe on their products or technology, we could face a number of issues, including:

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infringement and other intellectual property claims which, whether meritorious or not, can be expensive and time consuming to litigate and can divert management's attention from our core business;



•

substantial damages for past infringement which we may have to pay if a court decides that our product infringes on a competitor's patent;

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•

a court prohibiting us from selling or licensing our product unless the patent holder licenses the patent to us, which it would not be required to do;



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if a license is available from a patent holder, we may have to pay substantial royalties or grant cross licenses to our patents; and



•

redesigning our product candidates and processes so they do not infringe, which may not be possible or could require substantial funds and time.

        If we are found to infringe a third party's intellectual property rights, we could be required to obtain a license from such third party to continue developing and marketing our products and technology. However, we may not be able to obtain any required license on commercially reasonable terms, or at all. Even if we were able to obtain a license, it could be non-exclusive, thereby giving our competitors access to the same technologies licensed to us. We could be forced, including by court order, to cease commercializing the infringing technology or product. In addition, we could be found liable for monetary damages, including treble damages and attorneys' fees if we are found to have willfully infringed a patent. A finding of infringement could prevent us from commercializing our product candidates or force us to cease some of our business operations, which could materially harm our business. Claims that we have misappropriated the confidential information or trade secrets of third parties could have a similar negative impact on our business, financial condition, results of operations, and prospects.

We may be involved in lawsuits to protect or enforce our patents or the patents of our licensors, which could be expensive, time consuming and unsuccessful.

        Competitors may infringe our issued patents, our in-licensed patents, or other intellectual property that we own or in-license. Under the terms of our license agreements with Antecip, if we believe a third party is infringing on the patents subject to the licenses, we are obligated, at our own expense, to initiate suit against those third parties. To counter infringement or unauthorized use, we may be required to file infringement claims, which can be expensive and time consuming. Any claims we assert against perceived infringers could provoke these parties to assert counterclaims against us alleging that we infringe their patents. In addition, in a patent infringement proceeding, a court may decide that a patent of ours is invalid or unenforceable, in whole or in part; construe the patent's claims narrowly; or refuse to stop the other party from using the technology at issue on the grounds that our patents do not cover the technology in question. An adverse result in any litigation proceeding could put one or more of our patents at risk of being invalidated or interpreted narrowly. Furthermore, because of the substantial amount of discovery required in connection with intellectual property litigation, there is a risk that some of our confidential information could be compromised by disclosure during this type of litigation.

        Most of our competitors are larger than we are and have substantially greater resources than we do. They are, therefore, likely to be able to sustain the costs of complex patent litigation longer than we could. In addition, the uncertainties associated with litigation could have a material adverse effect on our ability to raise the funds necessary to continue our clinical trials, continue our internal research programs, in-license needed technology, or enter into development partnerships that would help us bring our product candidates to market.

We may need to license certain intellectual property from third parties, and such licenses may not be available or may not be available on commercially reasonable terms.

        A third party may hold intellectual property, including patent rights that are important or necessary to the development or commercialization of our products. It may be necessary for us to use the patented or proprietary technology of third parties to commercialize our products, in which case we would be required to obtain a license from these third parties. Such a license may not be available on

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commercially reasonable terms, or at all, which could materially harm our business, financial condition, results of operations, and prospects.

We may be subject to claims that our employees, independent contractors, or consultants have wrongfully used or disclosed alleged trade secrets of their former employers or other third parties.

        As is common in the biotechnology and pharmaceutical industry, we employ individuals who were previously employed at other biotechnology or pharmaceutical companies, including our competitors or potential competitors. Although no claims against us are currently pending, we may be subject to claims that these individuals or we have inadvertently or otherwise used or disclosed trade secrets or other proprietary information of their former employers. Litigation may be necessary to defend against these claims. Even if we are successful in defending against these claims, litigation could result in substantial costs and be a distraction to management.

We may be unable to adequately prevent disclosure of trade secrets and other proprietary information.

        We rely on trade secrets to protect our proprietary technological advances and know-how, especially where we do not believe patent protection is appropriate or obtainable. However, trade secrets are difficult to protect. We rely in part on confidentiality agreements with our employees, consultants, contractors, outside scientific collaborators, sponsored researchers, and other advisors, including the third parties we rely on to manufacture our product candidates, to protect our trade secrets and other proprietary information. However, any party with whom we have executed such an agreement may breach that agreement and disclose our proprietary information, including our trade secrets. Accordingly, these agreements may not effectively prevent disclosure of confidential information and may not provide an adequate remedy in the event of unauthorized disclosure of confidential information. Costly and time-consuming litigation could be necessary to enforce and determine the scope of our proprietary rights. In addition, others may independently discover our trade secrets and proprietary information. Further, the FDA, as part of its Transparency Initiative, a proposal to increase disclosure and make data more accessible to the public, is currently considering whether to make additional information publicly available on a routine basis, including information that we may consider to be trade secrets or other proprietary information, and it is not clear at the present time how the FDA's disclosure policies may change in the future, if at all. Failure to obtain or maintain trade secret protection could enable competitors to use our proprietary information to develop products that compete with our products or cause additional, material adverse effects upon our competitive business position and financial results.

We or our licensors may not be able to protect our intellectual property rights throughout the world.

        Filing, prosecuting, and defending patents on product candidates in all countries throughout the world would be prohibitively expensive, and our intellectual property rights in some countries outside the United States can be less extensive than those in the United States. In addition, the laws of some foreign countries do not protect intellectual property rights to the same extent as federal and state laws in the United States. Consequently, we may not be able to prevent third parties from practicing our inventions in all countries outside the United States, or from selling or importing products made using our inventions in and into the United States or other jurisdictions. Competitors may use our technologies in jurisdictions where we have not obtained patent protection to develop their own products and further, may export otherwise infringing products to territories where we have patent protection, but enforcement rights are not as strong as those in the United States. These products may compete with our product candidates and our patents or other intellectual property rights may not be effective or sufficient to prevent them from competing.

        Many companies have encountered significant problems in protecting and defending intellectual property rights in foreign jurisdictions. The legal systems of certain countries do not favor the

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enforcement of patents and other intellectual property protection, which could make it difficult for us to stop the infringement of our patents generally. Proceedings to enforce our patent rights in foreign jurisdictions could result in substantial costs and divert our efforts and attention from other aspects of our business, could put our patents at risk of being invalidated or interpreted narrowly and our patent applications at risk of not issuing and could provoke third parties to assert claims against us. We may not prevail in any lawsuits that we initiate and the damages or other remedies awarded, if any, may not be commercially meaningful. Accordingly, our efforts to enforce our or our licensors' intellectual property rights around the world may be inadequate to obtain a significant commercial advantage from the intellectual property that we develop or license.

RISKS RELATED TO LEGAL AND COMPLIANCE MATTERS

If we fail to comply with federal and state healthcare laws, including fraud and abuse and health and other information privacy and security laws, we could face substantial penalties and our business, financial condition, results of operations, and prospects could be adversely affected.

        As a pharmaceutical company, we are subject to many federal and state healthcare laws, including those described in the "Business—Government Regulation and Product Approval" section of this prospectus, such as the federal Anti-Kickback Statute, the federal civil and criminal False Claims Act, the civil monetary penalties statute, the Medicaid Drug Rebate statute and other price reporting requirements, the Veterans Health Care Act of 1992, the federal Health Insurance Portability and Accountability Act of 1996 (as amended by the Health Information Technology for Economics and Clinical Health Act), the Foreign Corrupt Practices Act of 1977, the Patient Protection and Affordable Care Act of 2010, and similar state laws. Even though we do not and will not control referrals of healthcare services or bill directly to Medicare, Medicaid, or other third-party payors, certain federal and state healthcare laws and regulations pertaining to fraud and abuse and patients' rights are and will be applicable to our business. We would be subject to healthcare fraud and abuse and patient privacy regulation by both the federal government and the states in which we conduct our business.

        If we or our operations are found to be in violation of any federal or state healthcare law, or any other governmental regulations that apply to us, we may be subject to penalties, including civil, criminal, and administrative penalties, damages, fines, disgorgement, debarment from government contracts, and refusal of orders under existing contracts, exclusion from participation in U.S. federal or state health care programs, corporate integrity agreements, and the curtailment or restructuring of our operations, any of which could materially adversely affect our ability to operate our business and our financial results. If any of the physicians or other healthcare providers or entities with whom we expect to do business, including our collaborators, is found not to be in compliance with applicable laws, it may be subject to criminal, civil or administrative sanctions, including but not limited to, exclusions from participation in government healthcare programs, which could also materially affect our business.

        Although an effective compliance program can mitigate the risk of investigation and prosecution for violations of these laws, the risks cannot be entirely eliminated. Moreover, achieving and sustaining compliance with applicable federal and state privacy, security, and fraud laws may prove costly. Any action against us for violation of these laws, even if we successfully defend against it, could cause us to incur significant legal expenses and divert our management's attention from the operation of our business.

If the government or third-party payors fail to provide adequate coverage and payment rates for AXS-02, AXS-05, or any other of our current or future product candidates, or if HMOs or long-term care facilities choose to use therapies that are less expensive, our revenue and prospects for profitability will be limited.

        In both domestic and foreign markets, sales of our future products will depend in part upon the availability of coverage and reimbursement from third-party payors. Such third-party payors include

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government health programs such as Medicare and Medicaid, managed care providers, private health insurers, and other organizations. Coverage decisions may depend upon clinical and economic standards that disfavor new drug products when more established or lower cost therapeutic alternatives are already available or subsequently become available. If reimbursement is not available, or is available only to limited levels, our product candidates may be competitively disadvantaged, and we, or our collaborators, may not be able to successfully commercialize our product candidates. Even if coverage is provided, the approved reimbursement amount may not be high enough to allow us, or our collaborators, to establish or maintain a market share sufficient to realize a sufficient return on our or their investments. Alternatively, securing favorable reimbursement terms may require us to compromise pricing and prevent us from realizing an adequate margin over cost.

        There is significant uncertainty related to third-party payor coverage and reimbursement of newly approved drugs. Marketing approvals, pricing, and reimbursement for new drug products vary widely from country to country. Current and future legislation may significantly change the approval requirements in ways that could involve additional costs and cause delays in obtaining approvals. Some countries require approval of the sale price of a drug before it can be marketed. In many countries, the pricing review period begins after marketing or product licensing approval is granted. In some foreign markets, prescription pharmaceutical pricing remains subject to continuing governmental control even after initial approval is granted. As a result, we might obtain marketing approval for a product in a particular country, but then be subject to price regulations that delay commercial launch of the product, possibly for lengthy time periods, which may negatively impact the revenues we are able to generate from the sale of the product in that country. Adverse pricing limitations may hinder our ability or the ability of our collaborators to recoup our or their investment in one or more product candidates, even if our product candidates obtain marketing approval. Our ability, and the ability of our collaborators, to commercialize our product candidates will depend in part on the extent to which coverage and reimbursement for these products and related treatments will be available from government health administration authorities, private health insurers and other organizations. Regulatory authorities and third-party payors, such as private health insurers, and health maintenance organizations, decide which medications they will cover and establish reimbursement levels. The healthcare industry is acutely focused on cost containment, both in the United States and elsewhere. Several third-party payors are requiring that drug companies provide them with predetermined discounts from list prices, are using preferred drug lists to leverage greater discounts in competitive classes, are disregarding therapeutic differentiators within classes, and are challenging the prices charged for drugs. Brand drugs without generic equivalents are often included in therapeutic classes with other brands that have generic versions and may be similarly disadvantaged by the availability of low cost alternatives within the class, particularly if a generic version of the same agent is available in another form.

        Third-party payors, whether foreign or domestic, or governmental or commercial, are developing increasingly sophisticated methods of controlling healthcare costs. In addition, in the United States, no uniform policy of coverage and reimbursement for drug products exists among third-party payors. Therefore, coverage and reimbursement for drug products can differ significantly from payor to payor. Further, we believe that future coverage and reimbursement will likely be subject to increased restrictions both in the United States and in international markets. Third-party coverage and reimbursement for our products or product candidates for which we receive regulatory approval may not be available or adequate in either the United States or international markets, which could have a negative effect on our business, financial condition, results of operations, and prospects.

        Assuming coverage is approved, the resulting reimbursement payment rates might not be adequate. If payors subject our product candidates to maximum payment amounts, or impose limitations that make it difficult to obtain reimbursement, providers may choose to use therapies which are less expensive when compared to our product candidates. Additionally, if payors require high copayments, beneficiaries may decline prescriptions and seek alternative therapies. We may need to conduct

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post-marketing studies in order to demonstrate the cost-effectiveness of any future products to the satisfaction of hospitals, other target customers and their third-party payors. Such studies might require us to commit a significant amount of management time and financial and other resources. Our future products might not ultimately be considered cost-effective. Adequate third-party coverage and reimbursement might not be available to enable us to maintain price levels sufficient to realize an appropriate return on investment in product development.

        In addition, federal programs impose penalties on manufacturers of drugs marketed under an NDA, including 505(b)(2) drugs, in the form of mandatory additional rebates and/or discounts if commercial prices increase at a rate greater than the Consumer Price Index-Urban, and these rebates and/or discounts, which can be substantial, may impact our ability to raise commercial prices. Regulatory authorities and third-party payors have attempted to control costs by limiting coverage and the amount of reimbursement for particular medications, which could affect our ability or that of our collaborators to sell our product candidates profitably. These payors may not view our products, if any, as cost-effective, and coverage and reimbursement may not be available to our customers, or those of our collaborators, or may not be sufficient to allow our products, if any, to be marketed on a competitive basis. Cost-control initiatives could cause us, or our collaborators, to decrease, discount, or rebate a portion of the price we, or they, might establish for products, which could result in lower than anticipated product revenues. If the realized prices for our products, if any, decrease or if governmental and other third-party payors do not provide adequate coverage or reimbursement, our prospects for revenue and profitability will suffer.

        There may also be delays in obtaining coverage and reimbursement for newly approved drugs, and coverage may be more limited than the indications for which the drug is approved by the FDA or comparable foreign regulatory authorities. Moreover, eligibility for reimbursement does not imply that any drug will be paid for in all cases or at a rate that covers our costs, including research, development, manufacture, sale, and distribution. Interim reimbursement levels for new drugs, if applicable, may also not be sufficient to cover our costs and may only be temporary. Reimbursement rates may vary, by way of example, according to the use of the drug and the clinical setting in which it is used. Reimbursement rates may also be based on reimbursement levels already set for lower cost drugs or may be incorporated into existing payments for other services.

        Prices paid for a drug also vary depending on the class of trade. Prices charged to government customers are subject to price controls, including ceilings, and private institutions obtain discounts through group purchasing organizations. Net prices for drugs may be further reduced by mandatory discounts or rebates required by government healthcare programs and demanded by private payors. Drugs approved under NDAs, including 505(b)(2) drugs, are subject to greater discounts and reporting obligations under federal programs than drugs approved under ANDAs, and the inflation penalty applicable to these products can equal the selling price. It is also not uncommon for market conditions to warrant multiple discounts to different customers on the same unit, such as purchase discounts to institutional care providers and rebates to the health plans that pay them, which reduces the net realization on the original sale.

        In addition, increasingly, third-party payors are requiring higher levels of evidence of the benefits and clinical outcomes of new technologies and are challenging the prices charged. We, and our collaborators, cannot be sure that coverage will be available for any product candidate that we, or they, commercialize and, if available, that the reimbursement rates will be adequate. Further, the net reimbursement for drug products may be subject to additional reductions if there are changes to laws that presently restrict imports of drugs from countries where they may be sold at lower prices than in the United States. An inability to promptly obtain coverage and adequate payment rates from both government-funded and private payors for any our product candidates for which we obtain marketing approval could have a material adverse effect on our operating results, our ability to raise capital needed to commercialize products and our overall financial condition.

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We are subject to new legislation, regulatory proposals and healthcare payor initiatives that may increase our costs of compliance, and adversely affect our ability to market our products, obtain collaborators, and raise capital.

        In the United States and some foreign jurisdictions, there have been a number of legislative and regulatory changes and proposed changes regarding the healthcare system that could prevent or delay marketing approval of our product candidates, restrict or regulate post-approval activities and affect our ability, or the ability of our collaborators, to profitably sell any products for which we obtain marketing approval. We expect that current laws, as well as other healthcare reform measures that may be adopted in the future, may result in more rigorous coverage criteria and in additional downward pressure on the price that we, or our collaborators, may receive for any approved products.

        For example, legislative changes have been proposed and adopted since President Obama signed into law the Affordable Care Act, or ACA, in 2010. These changes include, among other things, aggregate reductions to Medicare payments to providers of up to 2% per fiscal year, which went effective on April 1, 2013. In addition, in January 2013, President Obama signed into law the American Taxpayer Relief Act of 2012, which, among other things, further reduced Medicare payments to several providers and increased the statute of limitations period for the government to recover overpayments to providers from three to five years. Changes imposed by recent legislative actions are further described in the "Business—Governmental Regulation and Product Approval" section of this prospectus. These new laws may result in additional reductions in Medicare and other healthcare funding, which could have a material adverse effect on customers for our drugs, if approved, and, accordingly, on our results of operations.

        While the full effect that the ACA may have on our business remains unclear, we expect that the ACA, as well as other federal and state healthcare reform measures that may be adopted in the future, may result in more rigorous coverage criteria, increased regulatory burdens and operating costs, decreased net revenue from our pharmaceutical products, decreased potential returns from our development efforts, and in additional downward pressure on the price that we receive for any approved drug. Any reduction in reimbursement from Medicare or other government healthcare programs may result in a similar reduction in payments from private payors. The implementation of cost containment measures or other healthcare reforms may prevent us from being able to generate revenue, attain profitability or commercialize our drugs.

        Legislative and regulatory proposals may also be made to expand post-approval requirements and restrict sales and promotional activities for drugs. We cannot be sure whether additional legislative changes will be enacted, or whether the FDA regulations, guidance or interpretations will be changed, or what the impact of such changes on the marketing approvals of our product candidates, if any, may be. In addition, increased scrutiny by the U.S. Congress of the FDA's approval process may significantly delay or prevent marketing approval, as well as subject us to more stringent product labeling and post-marketing testing and other requirements.

        In addition, there have been a number of other legislative and regulatory proposals aimed at changing the pharmaceutical industry. For instance, the recently enacted Drug Quality and Security Act imposes new obligations on manufacturers of pharmaceutical products related to product tracking and tracing. Among the requirements of this new legislation, manufacturers will be required to provide certain information regarding the drug product to individuals and entities to which product ownership is transferred, label drug product with a product identifier and keep certain records regarding the drug product. The transfer of information to subsequent product owners by manufacturers will eventually be required to be done electronically. Manufacturers will also be required to verify that purchasers of the manufacturers' products are appropriately licensed. Further, under this new legislation, manufactures will have drug product investigation, quarantine, disposition, and FDA and trading partner notification responsibilities related to counterfeit, diverted, stolen, and intentionally adulterated products that would result in serious adverse health consequences of death to humans, as well as products that are the subject of fraudulent transactions or which are otherwise unfit for distribution such that they would be reasonably likely to result in serious health consequences or death.

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        Compliance with the federal track and trace requirements may increase our operational expenses and impose significant administrative burdens. As a result of these and other new proposals, we may determine to change our current manner of operation, provide additional benefits or change our contract arrangements, any of which could have a material adverse effect on our business, financial condition, and results of operations.

Governments outside the United States tend to impose strict price controls, which may adversely affect our revenues, if any.

        In international markets, reimbursement and health care payment systems vary significantly by country, and many countries have instituted price ceilings on specific products and therapies. In some countries, particularly the countries of the European Union, the pricing of prescription pharmaceuticals is subject to governmental control. In these countries, pricing negotiations with governmental authorities can take considerable time after the receipt of marketing approval for a product. To obtain coverage and reimbursement or pricing approval in some countries, we may be required to conduct a clinical trial that compares the cost-effectiveness of our product candidate to other available therapies. There can be no assurance that our products will be considered cost-effective by third-party payors, that an adequate level of reimbursement will be available or that the third-party payors' reimbursement policies will not adversely affect our ability to sell our products profitably. If reimbursement of our products is unavailable or limited in scope or amount, or if pricing is set at unsatisfactory levels, our business could be harmed, possibly materially.

Our employees, independent contractors, consultants, commercial partners, principal investigators, or CROs may engage in misconduct or other improper activities, including noncompliance with regulatory standards and requirements, which could have a material adverse effect on our business.

        We are exposed to the risk of employee fraud or other misconduct. Misconduct by employees, independent contractors, consultants, commercial partners, principal investigators, or CROs could include intentional, reckless, negligent, or unintentional failures to comply with FDA regulations, comply with applicable fraud and abuse laws, provide accurate information to the FDA, report financial information or data accurately or disclose unauthorized activities to us. This misconduct could also involve the improper use or misrepresentation of information obtained in the course of clinical trials, which could result in regulatory sanctions and serious harm to our reputation. It is not always possible to identify and deter this type of misconduct, and the precautions we take to detect and prevent this activity may not be effective in controlling unknown or unmanaged risks or losses or in protecting us from governmental investigations or other actions or lawsuits stemming from a failure to be in compliance with such laws or regulations. If any such actions are instituted against us, and we are not successful in defending ourselves or asserting our rights, those actions could have a significant impact on our business, financial condition, and results of operations, including the imposition of significant fines or other sanctions.

Our third-party manufacturers may use hazardous materials in the production of our product candidates and if so, they must comply with environmental laws and regulations, which can be expensive and restrict how we or they do business.

        Manufacturing activities for the production of our product candidates involve the controlled storage, use, and disposal of hazardous materials, including the components of our product candidates, and other hazardous compounds. Our third-party manufacturers and we are subject to federal, state, and local laws and regulations governing the use, manufacture, storage, handling, release, and disposal of, and exposure to, these hazardous materials. Violation of these laws and regulations could lead to substantial fines and penalties. Although we believe that our safety procedures, and those of our third-party manufacturers, for handling and disposing of these materials comply with the standards prescribed by these laws and regulations, we cannot eliminate the risk of accidental contamination or

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injury from these materials. In the event of an accident, state or federal authorities may curtail our use of these materials and interrupt our business operations. In addition, we could become subject to potentially material liabilities relating to the investigation and cleanup of any contamination, whether currently unknown or caused by future releases.

        Although we maintain workers' compensation insurance to cover us for costs and expenses we may incur due to injuries to our employees resulting from the use of hazardous materials, this insurance may not provide adequate coverage against potential liabilities. We do not maintain insurance for environmental liability or toxic tort claims that may be asserted against us in connection with our storage or disposal of biological, hazardous or radioactive materials.

        In addition, we may incur substantial costs in order to comply with current or future environmental, health, and safety laws and regulations. These current or future laws and regulations may impair our research, development or production efforts. Our failure to comply with these laws and regulations also may result in substantial fines, penalties, or other sanctions.

RISKS RELATED TO EMPLOYEE MATTERS, MANAGING GROWTH AND BECOMING A PUBLIC COMPANY

We will need to significantly increase the size of our organization, and we may experience difficulties in managing growth.

        As of October 13, 2015, we had only 7 full-time employees and 2 key consultants. We will need to substantially expand our managerial, commercial, financial, manufacturing, and other personnel resources in order to manage our operations and prepare for the commercialization of AXS-02 and AXS-05, if approved. Our management, personnel, systems and facilities currently in place may not be adequate to support this future growth. In addition, we may not be able to recruit and retain qualified personnel in the future, particularly for sales and marketing positions, due to competition for personnel among pharmaceutical businesses, and the failure to do so could have a significant negative impact on our future product revenues and business results. Our need to effectively manage our operations, growth and various projects requires that we:

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continue the hiring and training of personnel for an effective commercial organization in anticipation of the potential approval of AXS-02 and AXS-05, and establish appropriate systems, policies and infrastructure to support that organization;



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ensure that our consultants and other service providers successfully carry out their contractual obligations, provide high quality results, and meet expected deadlines;



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continue to carry out our own contractual obligations to our licensors and other third parties; and



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continue to improve our operational, financial, and management controls, reporting systems, and procedures.

        We may be unable to successfully implement these tasks on a larger scale and, accordingly, may not achieve our development and commercialization goals.

We may acquire businesses or products, or form strategic alliances in the future, and we may not realize the benefits of such acquisitions or alliances.

        We may acquire additional businesses or products, form strategic alliances or create joint ventures with third parties that we believe will complement or augment our existing business. If we acquire businesses with promising markets or technologies, we may not be able to realize the benefit of acquiring such businesses if we are unable to successfully integrate them with our existing operations and company culture. We may encounter numerous difficulties in developing, manufacturing, and marketing any new products resulting from a strategic alliance or acquisition that delay or prevent us

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from realizing their expected benefits or enhancing our business. We cannot assure you that, following any such acquisition, we will achieve the expected synergies to justify the transaction.

We may not be able to manage our business effectively if we are unable to attract and retain key personnel.

        We may not be able to attract or retain qualified management and commercial, scientific, and clinical personnel due to the intense competition for qualified personnel among biotechnology, pharmaceutical, and other businesses. If we are not able to attract and retain necessary personnel to accomplish our business objectives, we may experience constraints that will significantly impede the achievement of our development objectives, our ability to raise additional capital and our ability to implement our business strategy.

        Our industry has experienced a high rate of turnover of management personnel in recent years. We are highly dependent on the skills and leadership of our management team, including Dr. Herriot Tabuteau, our Chief Executive Officer and Chairman of the Board. We do not have formal employment agreements with any of our management team. However, we typically enter into offer letters with our executive officers and key personnel. Our senior management may terminate their employment with us at any time. If we lose one or more members of our senior management team, our ability to successfully implement our business strategy could be seriously harmed. Replacing these employees may be difficult and may take an extended period of time because of the limited number of individuals in our industry with the breadth of skills and experience required to develop, gain regulatory approval of and commercialize products successfully. Competition to hire from this limited pool is intense, and we may be unable to hire, train, retain or motivate additional key personnel. We do not maintain "key person" insurance for any of our executives or other employees.

We will incur increased costs as a result of operating as a public company.

        As a public company, and particularly after we are no longer an emerging growth company, we will incur significant legal, accounting, and other expenses that we did not incur as a private company. The Sarbanes-Oxley Act of 2002, the Dodd-Frank Wall Street Reform and Consumer Protection Act, the listing requirements of The NASDAQ             Market and other applicable securities rules and regulations impose various requirements on public companies, including establishment and maintenance of effective disclosure and financial controls and corporate governance practices. Our management and other personnel will need to devote a substantial amount of time to these compliance initiatives. Moreover, these rules and regulations will increase our legal and financial compliance costs and will make some activities more time consuming and costly. For example, we expect that these rules and regulations may make it more difficult and more expensive for us to obtain director and officer liability insurance, which in turn could make it more difficult for us to attract and retain qualified members of our board of directors.

        We are evaluating these rules and regulations, and cannot predict or estimate the amount of additional costs we may incur or the timing of such costs. These rules and regulations are often subject to varying interpretations, in many cases due to their lack of specificity, and, as a result, their application in practice may evolve over time as new guidance is provided by regulatory and governing bodies. This could result in continuing uncertainty regarding compliance matters and higher costs necessitated by ongoing revisions to disclosure and governance practices.

If we fail to maintain proper and effective internal controls, our ability to produce accurate financial statements on a timely basis could be impaired.

        After the completion of this offering, we will be subject to the reporting requirements of the Securities Exchange Act of 1934, the Sarbanes-Oxley Act of 2002 and the rules and regulations of The NASDAQ            Market. Pursuant to Section 404 of the Sarbanes-Oxley Act of 2002, or Section 404, we will be required to furnish a report by our management on our internal control over financial

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reporting. However, while we remain an emerging growth company, we will not be required to include an attestation report on internal control over financial reporting issued by our independent registered public accounting firm. Commencing with our fiscal year ending December 31, 2016, we must perform system and process evaluation and testing of our internal control over financial reporting to allow management to report on the effectiveness of our internal controls over financial reporting in our Form 10-K filing for that year, as required by Section 404.

        To achieve compliance with Section 404 within the prescribed period, we will be engaged in a process to document and evaluate our internal control over financial reporting, which is both costly and challenging. In this regard, we will need to continue to dedicate internal resources, potentially engage outside consultants and adopt a detailed work plan to assess and document the adequacy of internal control over financial reporting, continue steps to improve control processes as appropriate, validate through testing that controls are functioning as documented and implement a continuous reporting and improvement process for internal control over financial reporting. Despite our efforts, there is a risk that we will not be able to conclude, within the prescribed timeframe or at all, that our internal control over financial reporting is effective as required by Section 404. Prior to this offering, we have never been required to test, nor have we tested, our internal controls within a specified period, and, as a result, we may experience difficulty in meeting these reporting requirements in a timely manner.

        We may discover weaknesses in our system of internal financial and accounting controls and procedures that could result in a material misstatement of our financial statements. Our internal control over financial reporting will not prevent or detect all error and all fraud. A control system, no matter how well designed and operated, can provide only reasonable, not absolute, assurance that the control system's objectives will be met. Because of the inherent limitations in all control systems, no evaluation of controls can provide absolute assurance that misstatements due to error or fraud will not occur or that all control issues and instances of fraud will be detected. If we are not able to comply with the requirements of Section 404 in a timely manner, or if we identify one or more material weaknesses in our internal controls, investors could lose confidence in the reliability of our financial statements, the market price of our stock could decline and we could be subject to sanctions or investigations by The NASDAQ            Market, the SEC, or other regulatory authorities.

Our business and operations would suffer in the event of system failures.

        Despite our implementation of security measures, our internal computer systems and those of our CROs and other contractors and consultants are vulnerable to damage from computer viruses, unauthorized access, natural disasters, terrorism, war, and telecommunication and electrical failures. If such an event were to occur and cause interruptions in our operations, it could result in a material disruption of our product candidate development programs. For example, the loss of clinical trial data from completed, ongoing or planned clinical trials could result in delays in our regulatory approval efforts and significantly increase our costs to recover or reproduce the data. To the extent that any disruption or security breach were to result in a loss of or damage to our data or applications, or inappropriate disclosure of personal, confidential or proprietary information, we could incur liability and the further development of any of our product candidates could be delayed.

RISKS RELATED TO THIS OFFERING AND OWNERSHIP OF OUR COMMON STOCK

There is no established public market for our common stock and a public market may not be obtained or be liquid and therefore you may not be able to sell your shares.

        Prior to this offering, there has not been a public market for our common stock. If an active trading market for our common stock does not develop following this offering, you may not be able to sell your shares quickly or at the market price. The initial public offering price for the shares will be determined by negotiations between us and the representative of the underwriters and may not be indicative of prices that will prevail in the subsequent trading market.

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The market price of our common stock may be highly volatile, and you may not be able to resell your shares at or above the initial public offering price.

        The trading price of our common stock is likely to be volatile. As a result of this volatility, investors may not be able to sell their common stock at or above the price paid for the shares. The market price for our common stock may be influenced by many factors, including:

•

delays in the commencement, enrollment, and ultimate completion, of our planned Phase 3 clinical trials for AXS-02 and AXS-05;



•

any delay or refusal on the part of the FDA in approving an NDA for AXS-02, AXS-05, or any other of our current and future product candidates;



•

the commercial success of AXS-02, AXS-05, and any other of our current and future product candidates, if approved by the FDA;



•

results of clinical trials of AXS-02, AXS-05, and any other of our current and future product candidates or those of our competitors;



•

actual or anticipated variations in quarterly or annual operating results;



•

failure to meet or exceed financial projections we provide to the public, if any;



•

failure to meet or exceed the estimates and projections of the investment community, including securities analysts;



•

introduction of competitive products or technologies;



•

changes or developments in laws or regulations applicable to our product candidates;



•

the perception of the pharmaceutical industry by the public, legislatures, regulators, and the investment community;



•

general economic and market conditions and overall fluctuations in U.S. equity markets;



•

developments concerning our sources of manufacturing supply, warehousing, and inventory control;



•

disputes or other developments relating to patents or other proprietary rights;



•

additions or departures of key scientific or management personnel;



•

announcements of investigations or regulatory scrutiny of our operations or lawsuits filed against us;



•

capital commitments;



•

investors' general perception of our company and our business;



•

announcements and expectations of additional financing efforts, including the issuance of debt, equity or convertible securities;



•

sales of our common stock, including sales by our directors and officers or significant stockholders;



•

changes in the market valuations of companies similar to us;



•

announcements by us or our competitors of significant acquisitions, strategic partnerships, or divestitures;



•

general conditions or trends in our industry; and



•

the other factors described in this "Risk Factors" section.

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        In addition, the stock market in general, and the market for small pharmaceutical and biotechnology companies in particular, have experienced extreme price and volume fluctuations that have often been unrelated or disproportionate to the operating performance of these companies. Broad market and industry factors may negatively affect the market price of our common stock, regardless of our actual operating performance.

        Further, in the past, stockholders have initiated class action lawsuits against pharmaceutical and biotechnology companies following periods of volatility in the market prices of these companies' stocks. Such litigation, if instituted against us, could cause us to incur substantial costs and divert management's attention and resources from our business.

If equity research analysts do not publish research or reports, or publish unfavorable research or reports, about us, our business or our market, our stock price and trading volume could decline.

        The trading market for our common stock will be influenced by the research and reports that equity research analysts publish about us and our business. We do not currently have and may never obtain research coverage by equity research analysts. Equity research analysts may elect not to provide research coverage of our common stock after the completion of this offering, and such lack of research coverage may adversely affect the market price of our common stock. In the event we do have equity research analyst coverage, we will not have any control over the analysts or the content and opinions included in their reports. The price of our stock could decline if one or more equity research analysts downgrades our stock or issue other unfavorable commentary or research. If one or more equity research analysts ceases coverage of our company or fails to publish reports on us regularly, demand for our stock could decrease, which in turn could cause our stock price or trading volume to decline.

Our quarterly operating results may fluctuate significantly.

        We expect our operating results to be subject to quarterly fluctuations. Our net loss and other operating results will be affected by numerous factors, including:

•

whether the FDA requires us to complete additional, unanticipated studies, tests or other activities prior to approving AXS-02, AXS-05, or any other of our current and future product candidates, which would likely further delay any such approval;



•

if AXS-02, AXS-05, or any other of our current or future product candidates is approved, our ability to establish the necessary commercial infrastructure to launch this product candidate without substantial delays, including hiring sales and marketing personnel and contracting with third parties for warehousing, distribution, cash collection, and related commercial activities;



•

our ability to identify and enter into third-party manufacturing arrangements capable of manufacturing AXS-02, AXS-05, or any other of our current or future product candidates in commercial quantities;



•

our execution of other collaborative, licensing or similar arrangements and the timing of payments we may make or receive under these arrangements;



•

variations in the level of expenses related to our future development programs;



•

any product liability or intellectual property infringement lawsuit in which we may become involved;



•

regulatory developments affecting AXS-02, AXS-05, and our other current and future product candidates, or the product candidates of our competitors; and



•

if AXS-02, AXS-05, or any other of our current or future product candidates receive regulatory approval, the level of underlying demand for such product candidate and wholesaler buying patterns.

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        If our quarterly or annual operating results fall below the expectations of investors or securities analysts, the price of our common stock could decline substantially. Furthermore, any quarterly or annual fluctuations in our operating results may, in turn, cause the price of our stock to fluctuate substantially. We believe that quarterly comparisons of our financial results are not necessarily meaningful and should not be relied upon as an indication of our future performance.

Raising additional funds by issuing securities may cause dilution to existing stockholders and raising funds through lending and licensing arrangements may restrict our operations or require us to relinquish proprietary rights.

        Until such time, if ever, as we can generate substantial product revenues, we expect to finance our cash needs through a combination of equity offerings, debt financings, grants, and license and development agreements in connection with any collaborations. We do not have any committed external source of funds. To the extent that we raise additional capital by issuing equity securities, our existing stockholders' ownership will be diluted, and the terms of these securities may include liquidation or other preferences that adversely affect your rights as a common stockholder. Debt financing and preferred equity financing, if available, may involve agreements that include covenants limiting or restricting our ability to take specific actions, such as incurring additional debt, making capital expenditures or declaring dividends.

        If we raise additional funds through collaborations, strategic alliances or marketing, distribution or licensing arrangements with third parties, we may have to relinquish valuable rights to our technologies, future revenue streams, research programs or product candidates or grant licenses on terms that may not be favorable to us. Any debt financing we enter into may involve covenants that restrict our operations. These restrictive covenants may include limitations on additional borrowing and specific restrictions on the use of our assets as well as prohibitions on our ability to create liens, pay dividends, redeem our stock, or make investments. If we are unable to raise additional funds through equity or debt financings when needed, we may be required to delay, limit, reduce or terminate our product development or future commercialization efforts or grant rights to develop and market product candidates that we would otherwise prefer to develop and market ourselves.

Our principal stockholders and management own a significant percentage of our stock and will be able to exert significant control over matters subject to stockholder approval.

        Upon completion of this offering, assuming an initial public offering price of $            per share, which is the midpoint of the price range set forth on the cover page of this prospectus, our executive officers, directors, and 5% stockholders and their affiliates will beneficially own an aggregate of approximately         % of our outstanding common stock, excluding any shares of common stock that our existing stockholders may purchase in this offering. As a result, these stockholders will have significant influence and may be able to determine all matters requiring stockholder approval. For example, these stockholders may be able to control elections of directors, amendments of our organizational documents, or approval of any merger, sale of assets, or other major corporate transaction. This concentration of ownership could delay or prevent any acquisition of our company on terms that other stockholders may desire, and may adversely affect the market price of our common stock.

        Some of these persons or entities may have interests different than yours. For example, because many of these stockholders purchased their shares at prices substantially below the price at which shares are being sold in this offering and have held their shares for a longer period, they may be more interested in selling our company to an acquirer than other investors, or they may want us to pursue strategies that deviate from the interests of other stockholders.

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Sales of a substantial number of shares of our common stock in the public market by our existing stockholders could cause our stock price to fall.

        Sales of a substantial number of shares of our common stock in the public market or the perception that these sales might occur, could depress the market price of our common stock and could impair our ability to raise adequate capital through the sale of additional equity securities. We are unable to predict the effect that sales may have on the prevailing market price of our common stock.

        Upon completion of this offering, we will have outstanding            shares of common stock, assuming no exercise of the underwriters' over-allotment option or of outstanding options or warrants. Of these shares, the            shares sold in this offering and            additional shares will be freely tradable,            additional shares of common stock will be available for sale in the public market beginning 180 days after the date of this prospectus following the expiration of lock-up agreements between some of our stockholders and the underwriters, subject, in the case of our affiliates, to the volume, manner of sale and other limitations of Rule 144, and            shares issued or issuable upon exercise of options and warrants vested as of the expiration of the lock-up period will be eligible for sale at that time, subject, in the case of our affiliates, to the volume, manner of sale and other limitations of Rule 144. The representative of the underwriters may release these stockholders from their lock-up agreements with the underwriters at any time and without notice, which would allow for earlier sales of shares in the public market. Sales of stock by these stockholders could have a material adverse effect on the market price of our common stock.

        In addition, promptly following the completion of this offering, we intend to file one or more registration statements on Form S-8 registering the issuance of approximately             shares of common stock subject to options or other equity awards issued or reserved for future issuance under our 2013 Equity Compensation Plan. Shares registered under these registration statements on Form S-8 will be available for sale in the public market subject to vesting arrangements and exercise of options, the lock-up agreements described above and the restrictions of Rule 144 in the case of our affiliates.

Our management will have broad discretion in the use of the net proceeds from this offering and may not use them effectively.

        Our management will have broad discretion in the application of the net proceeds from this offering and our stockholders will not have the opportunity as part of their investment decision to assess whether the net proceeds are being used appropriately. You may not agree with our decisions, and our use of the proceeds may not yield any return on your investment. Because of the number and variability of factors that will determine our use of the net proceeds from this offering, their ultimate use may vary substantially from their currently intended use. Our failure to apply the net proceeds of this offering effectively could compromise our ability to pursue our growth strategy and we might not be able to yield a significant return, if any, on our investment of these net proceeds. You will not have the opportunity to influence our decisions on how to use our net proceeds from this offering. Pending their use, we may invest the net proceeds from this offering in short-term, investment-grade, interest-bearing instruments and U.S. government securities. These temporary investments are not likely to yield a significant return.

If you purchase our common stock in this offering, you will incur immediate and substantial dilution in the book value of your shares.

        The initial public offering price of our common stock is substantially higher than the pro forma net tangible book value per share of our common stock as of June 30, 2015, after giving effect to this offering. Investors purchasing common stock in this offering will pay a price per share that substantially exceeds the book value of our tangible assets after subtracting our liabilities. Based on an assumed initial public offering price of $            per share, which is the midpoint of the price range set forth on the cover page of this prospectus, you will experience immediate dilution of $            per share, or

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$            per share if the underwriters exercise their over-allotment option in full, representing the difference between our pro forma net tangible book value per share, after giving effect to this offering, and the assumed initial public offering price. In addition, purchasers of common stock in this offering will have contributed approximately        % of the aggregate price paid by all purchasers of our stock, but will own only approximately        % of our common stock outstanding after this offering. See "Dilution." In addition, as of June 30, 2015, options and warrants to purchase an aggregate of 159,529 shares of our common stock at a weighted average exercise price of $19.49 per share were outstanding. The exercise of any of these options or warrants would result in additional dilution. As a result of the dilution to investors purchasing shares in this offering, investors may receive significantly less than the purchase price paid in this offering, if anything, in the event of a liquidation or sale of our company.

We are an "emerging growth company" and as a result of the reduced disclosure and governance requirements applicable to emerging growth companies, our common stock may be less attractive to investors.

        We are an "emerging growth company," as defined in the Jumpstart Our Business Startups Act of 2012, or JOBS Act, and we intend to take advantage of some of the exemptions from reporting requirements that are applicable to other public companies that are not emerging growth companies, including not being required to comply with the auditor attestation requirements of Section 404, reduced disclosure obligations regarding executive compensation in our periodic reports and proxy statements, and exemptions from the requirements of holding a nonbinding advisory vote on executive compensation and stockholder approval of any golden parachute payments not previously approved. We may take advantage of these reporting exemptions until we are no longer an emerging growth company. We cannot predict if investors will find our common stock less attractive because we will rely on these exemptions. If some investors find our common stock less attractive as a result, there may be a less active trading market for our common stock and our stock price may be more volatile.

        We will remain an emerging growth company until the earlier of (1) the last day of the fiscal year (a) following the fifth anniversary of the completion of this offering, (b) in which we have total annual gross revenue of at least $1.0 billion, or (c) in which we are deemed to be a large accelerated filer, which means the market value of our common stock that is held by non-affiliates exceeds $700 million as of the prior June 30th, and (2) the date on which we have issued more than $1.0 billion in non-convertible debt during the prior three-year period. To the extent we are no longer eligible to use exemptions from various reporting requirements under the JOBS Act, we may be unable to realize our anticipated cost savings from these exemptions, which could have a material adverse impact on our operating results.

The use of our net operating loss carryforwards and research tax credits may be limited.

        Our net operating loss carryforwards and any future research and development tax credits may expire and not be used. As of December 31, 2013 and 2014, we had U.S. net operating loss carryforwards of approximately $2.2 million and $6.6 million, respectively. Our net operating loss carryforwards will begin expiring in 2033 if we have not used them prior to that time. Additionally, our ability to use any net operating loss and credit carryforwards to offset taxable income or tax, respectively, in the future will be limited under Internal Revenue Code Sections 382 and 383, respectively, if we have a cumulative change in ownership of more than 50% within a three-year period. The completion of this offering, together with private placements and other transactions that have occurred, may trigger, or may have already triggered such an ownership change. In addition, since we will need to raise substantial additional funding to finance our operations, we may undergo further ownership changes in the future. We have never completed an analysis as to whether such a change of ownership has occurred, but in such an event, we will be limited regarding the amount of net operating loss carryforwards and research tax credits that could be utilized annually in the future to offset taxable income or tax, respectively. Any such annual limitation may significantly reduce the utilization of the net operating loss carryforwards and research tax credits before they expire. In addition, certain states

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have suspended use of net operating loss carryforwards for certain taxable years, and other states are considering similar measures. As a result, we may incur higher state income tax expense in the future. Depending on our future tax position, continued suspension of our ability to use net operating loss carryforwards in states in which we are subject to income tax could have an adverse impact on our results of operations and financial condition.

Because we do not intend to pay dividends on our common stock, your returns will be limited to any increase in the value of our stock.

        We have never declared or paid any cash dividends on our capital stock. We currently intend to retain all available funds and any future earnings to support our operations and finance the growth and development of our business and do not anticipate declaring or paying any cash dividends on our common stock for the foreseeable future. Any return to stockholders will therefore be limited to the appreciation of their stock, if any. Investors seeking cash dividends should not purchase our common stock.

Provisions in our corporate charter documents and under Delaware law may prevent or frustrate attempts by our stockholders to change our management and hinder efforts to acquire a controlling interest in us, and the market price of our common stock may be lower as a result.

        There are provisions in our amended and restated certificate of incorporation and amended and restated bylaws, as will be in effect following the completion of this offering, that may make it difficult for a third party to acquire, or attempt to acquire, control of our company, even if a change in control was considered favorable by you and other stockholders. For example, our board of directors will have the authority to issue up to                        shares of preferred stock and to fix the price, rights, preferences, privileges, and restrictions of the preferred stock without any further vote or action by our stockholders. The issuance of shares of preferred stock may delay or prevent a change in control transaction. As a result, the market price of our common stock and the voting and other rights of our stockholders may be adversely affected. An issuance of shares of preferred stock may result in the loss of voting control to other stockholders.

        Our charter documents will also contain other provisions that could have an anti-takeover effect, including:

•

our board of directors will be divided into three classes, with only one class of directors elected each year;



•

our stockholders will be entitled to remove directors only for cause upon a 66²/3% vote;



•

our stockholders will not be permitted to take actions by written consent;



•

our stockholders will not be permitted to call a special meeting of stockholders; and



•

our stockholders must give us advance notice of their intent to nominate directors or submit proposals for consideration at stockholder meetings.

        In addition, we are subject to the anti-takeover provisions of Section 203 of the Delaware General Corporation Law, which regulates corporate acquisitions by prohibiting Delaware corporations from engaging in specified business combinations with particular stockholders of those companies. These provisions could discourage potential acquisition proposals and could delay or prevent a change in control transaction. They could also have the effect of discouraging others from making tender offers for our common stock, including transactions that may be in your best interests. These provisions may also prevent changes in our management or limit the price that investors are willing to pay for our stock.

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Our amended and restated certificate of incorporation designates the state or federal courts located in the State of Delaware as the sole and exclusive forum for certain types of actions and proceedings that may be initiated by our stockholders, which could limit our stockholders' ability to obtain a favorable judicial forum for disputes with us or our directors, officers or employees.

        Our amended and restated certificate of incorporation that will become effective upon the closing of this offering provides that, subject to limited exceptions, the state and federal courts located in the State of Delaware will be the sole and exclusive forum for (1) any derivative action or proceeding brought on our behalf, (2) any action asserting a claim of breach of a fiduciary duty owed by any of our directors, officers or other employees to us or our stockholders, (3) any action asserting a claim against us arising pursuant to any provision of the Delaware General Corporation Law, our amended and restated certificate of incorporation or our amended and restated bylaws, or (4) any other action asserting a claim against us that is governed by the internal affairs doctrine. Any person or entity purchasing or otherwise acquiring any interest in shares of our capital stock shall be deemed to have notice of and to have consented to the provisions of our amended and restated certificate of incorporation described above. This choice of forum provision may limit a stockholder's ability to bring a claim in a judicial forum that it finds favorable for disputes with us or our directors, officers or other employees, which may discourage such lawsuits against us and our directors, officers, and employees. Alternatively, if a court were to find these provisions of our amended and restated certificate of incorporation inapplicable to, or unenforceable in respect of, one or more of the specified types of actions or proceedings, we may incur additional costs associated with resolving such matters in other jurisdictions, which could adversely affect our business and financial condition.

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CAUTIONARY NOTE REGARDING FORWARD-LOOKING STATEMENTS

        From time to time, in reports filed with the Securities and Exchange Commission (including the registration statement of which this prospectus is a part), in press releases and in other communications to stockholders or the investment community, we may provide forward-looking statements concerning possible or anticipated future results of operations or business developments. These statements are based on our management's current expectations or predictions of future conditions, events or results based on various assumptions and our management's estimates of trends and economic factors in the markets in which we are active, as well as our business plans. Words such as "expects," "anticipates," "intends," "plans," "believes," "seeks," "estimates," "projects," "forecasts," "may," "should," and variations of such words and similar expressions are intended to identify such forward-looking statements. The forward-looking statements may include, without limitation, statements regarding product candidate development, product candidate potential, regulatory environment, sales and marketing strategies, capital resources, or operating performance. The forward-looking statements are subject to risks and uncertainties, which may cause results to differ materially from those set forth in the statements. Forward-looking statements in this prospectus should be evaluated together with the many risks and uncertainties that affect our business and our market, including those discussed in the "Risk Factors" included elsewhere in this prospectus. Forward-looking statements are not guarantees of future performance, and actual results may differ materially from those projected. The forward-looking statements are only predictions based upon our current expectations and projections about future events. Although we believe that the expectations reflected in the forward-looking statements are reasonable, we cannot guarantee that future results, levels of activity, performance, and events and circumstances reflected in the forward-looking statements will be achieved or will occur.

        You should read this prospectus and the documents that we reference in this prospectus and have been filed as exhibits to the registration statement of which this prospectus is a part completely and with the understanding that our actual future results may be materially different from what we expect. The information contained in this prospectus is accurate only as of the date of this prospectus, regardless of the time of delivery of this prospectus or any issuance or sale of our common stock. Except as required by law, we do not assume any obligation to update any forward-looking statements, whether as a result of new information, future events, or otherwise.

        We obtained the industry and market data in this prospectus from our own research as well as from industry and general publications and surveys and studies conducted by third parties. Industry and general publications, studies and surveys generally state that the information contained therein has been obtained from sources believed to be reliable. These third parties may, in the future, alter the manner in which they conduct surveys and studies regarding the markets in which we operate our business. As a result, you should carefully consider the inherent risks and uncertainties associated with the industry and market data contained in this prospectus, including those discussed under the heading "Risk Factors."

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USE OF PROCEEDS

        We estimate that the net proceeds from the sale of            shares of our common stock that we are offering will be approximately $             million, based on an assumed initial public offering price of $            per share, the midpoint of the price range set forth on the cover page of this prospectus, and after deducting the estimated underwriting discounts and commissions and estimated offering expenses payable by us. If the underwriters' over-allotment option is exercised in full, we estimate that we will receive net proceeds of approximately $             million after deducting the estimated underwriting discounts and commissions and estimated offering expenses payable by us.

        Each $1.00 increase (decrease) in the assumed initial public offering price of $            per share, the midpoint of the price range set forth on the cover page of this prospectus, would increase (decrease) the net proceeds to us from this offering by approximately $             million, assuming the number of shares offered by us, as set forth on the cover page of this prospectus, remains the same and after deducting underwriting discounts and commissions and estimated offering expenses payable by us. We may also increase or decrease the number of shares we are offering. Each increase (decrease) of 1,000,000 shares in the number of shares offered by us would increase (decrease) the net proceeds to us from this offering by approximately $             million, assuming that the assumed initial public offering price remains the same, and after deducting the underwriting discounts and commissions and estimated offering expenses payable by us. We do not expect that a change in the offering price or the number of shares by these amounts would have a material effect on our uses of the proceeds from this offering, although it may accelerate the time at which we will need to seek additional capital.

        We intend to use the proceeds from this offering as follows:

•

approximately $19 to $25 million to fund our clinical trials for AXS-02, including the completion of our ongoing Phase 3 trial in pain associated with CRPS and our planned Phase 3 trial in the pain of knee OA associated with BMLs, and the launch of our planned Phase 3 trial in CLBP associated with MCs;



•

approximately $14 to $17 million to fund our ongoing development of AXS-05, including the launch and completion of our planned Phase 3 trial of AXS-05 in TRD; and



•

the remainder for further development of our product candidates, working capital, and general corporate purposes.

        As of the date of this prospectus, we cannot specify with certainty all of the particular uses of the net proceeds to be received upon the completion of this offering. The amounts and timing of our actual expenditures will depend on numerous factors, including the progress of our development efforts, the status of and results from clinical trials, any collaborations that we may enter into with third parties for our product candidates, and any unforeseen cash needs. Accordingly, our management will have broad discretion in the application of the net proceeds and investors will be relying on the judgment of our management regarding the application of the net proceeds of this offering.

        Until we use the net proceeds of this offering for the above purposes, we intend to invest the funds in short-term, investment-grade, interest-bearing instruments and U.S. government securities. We cannot predict whether these investments will yield a favorable return.

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DIVIDEND POLICY

        We have not declared or paid any cash dividends on our capital stock since our inception. We currently anticipate that we will retain future earnings, if any, for the development, operation, and expansion of our business and do not anticipate declaring or paying any cash dividends in the foreseeable future. As a result, we anticipate that only appreciation of the price of our common stock, if any, will provide a return to investors in this offering for at least the foreseeable future.

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CAPITALIZATION

        The following table describes our capitalization as of June 30, 2015:

•

on an actual basis;



•

on a pro forma basis to give effect to (1) the automatic conversion of all our outstanding convertible notes, together with any accrued and unpaid interest thereon, into an aggregate of            shares of our common stock upon the closing of this offering, assuming an initial public offering price of $             per share (the midpoint of the price range set forth on the cover page of the prospectus); (2) in conjunction with the conversion of the convertible notes: (i) the accelerated amortization of $            of unamortized debt discount and $            of unamortized debt issuance costs and (ii) the reclassification of warrant and embedded derivative liabilities to additional paid-in capital as, upon the closing of this offering, neither is subject to remeasurement; and (3) the filing of our amended and restated certificate of incorporation, which will become effective immediately prior to the closing of this offering; and



•

on a pro forma as adjusted basis to also reflect the sale of            shares of common stock by us in this offering at an assumed initial public offering price of $            per share, which is the midpoint of the price range set forth on the cover page of this prospectus.

        You should read this capitalization table together with our consolidated financial statements and the related notes appearing elsewhere in this prospectus and the "Management's Discussion and Analysis of Financial Condition and Results of Operations" section and other financial information included elsewhere in this prospectus.

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        The preceding table excludes:

•

122,430 shares of common stock issuable upon exercise of stock options outstanding as of June 30, 2015, at a weighted average exercise price of $20.91 per share;



•

31,372 shares of common stock issuable upon the exercise of outstanding warrants as of June 30, 2015, at an exercise price of $9.55 per share;



•

5,727 shares of common stock issuable upon the exercise of outstanding warrants as of June 30, 2015, with a current exercise price of $43.64 per share. The warrant price will automatically adjust to a 10% premium to the conversion price of the convertible notes we issued from September 2014 through November 2014 during a mandatory conversion, defined in the notes as the occurrence of an equity financing of at least $2,000,000 in gross aggregate cash proceeds, in which the conversion price would be equal to $39.67 per share, as adjusted for capitalization changes; provided, however, if the initial public offering price is less than $39.67 per share, then the note conversion price will equal 75% of the initial public offering price; and



•

13,444 shares of common stock available for future grant under our 2013 Equity Compensation Plan as of June 30, 2015.

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DILUTION

        The historical net tangible book value of our common stock as of June 30, 2015, was $(7.4) million, or $(4.90) per share, based on the number of shares of common stock outstanding as of June 30, 2015. Historical net tangible book value per share is determined by dividing our total tangible assets less total liabilities by the actual number of outstanding shares of our common stock. As of June 30, 2015, we had a pro forma net tangible book value of $             million or $            per share of common stock. Pro forma net tangible book value per share is equal to our total tangible assets less total liabilities, divided by the pro forma number of shares of our outstanding common stock, counting as outstanding the shares of common stock issuable upon the conversion of all outstanding principal and interest accrued as of the date of this prospectus under our outstanding convertible notes into an aggregate of            shares of our common stock, assuming an initial public offering price of $            per share, which is the midpoint of the price range set forth on the cover page of the prospectus. After giving effect to the issuance of            shares of common stock offered hereby at an assumed initial public offering price of $            per share, which is the midpoint of the price range set forth on the cover page of this prospectus, and after deducting the estimated underwriting discounts and commissions and our estimated offering expenses, our pro forma net tangible book value as adjusted as of June 30, 2015, will be approximately $            , or approximately $            per pro forma share of common stock. This represents an immediate increase in pro forma net tangible book value of $            per share to our existing stockholders and an immediate dilution of $            per share to new investors in this offering. The following table illustrates this per share dilution:

        Dilution per share to new investors is determined by subtracting pro forma net tangible book value per share after this offering from the initial public offering price per share paid by a new investor. If any shares are issued in connection with outstanding options or warrants or the underwriters' over-allotment option, you will experience further dilution.

        Each $1.00 increase (decrease) in the assumed initial public offering price of $            per share, which is the midpoint of the price range set forth on the cover page of this prospectus, would increase (decrease) our pro forma as adjusted net tangible book value by $             million, the pro forma as adjusted net tangible book value per share after this offering by $            per share and the dilution in pro forma as adjusted net tangible book value to new investors in this offering by $            per share, assuming the number of shares offered by us, as set forth on the cover page of this prospectus, remains the same and after deducting the estimated underwriting discounts and commissions. We may also increase or decrease the number of shares we are offering. A 1,000,000 share increase in the number of shares offered by us, as set forth on the cover page of this prospectus, (1) would increase our pro forma as adjusted net tangible book value as of June 30, 2015, by approximately $             million and (2) would also increase the pro forma as adjusted net tangible book value per share after this offering and the dilution in net tangible book value per share to new investors by $            and $            , respectively, assuming the assumed initial public offering price of $            per share, which is the

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midpoint of the price range as set forth on the cover page of this prospectus, remains the same, after deducting estimated underwriting discounts and commissions. Conversely, a 1,000,000 share decrease in the number of shares offered by us, as set forth on the cover page of this prospectus, (1) would decrease our pro forma as adjusted net tangible book value as of June 30, 2015, by approximately $             million and (2) would also decrease the pro forma as adjusted net tangible book value per share after this offering and the dilution in net tangible book value per share to new investors by $            and $            , respectively, assuming the assumed initial public offering price of $            per share, which is the midpoint of the price range as set forth on the cover page of this prospectus, remains the same, after deducting estimated underwriting discounts and commissions.

        If the underwriters exercise their over-allotment option in full to purchase additional            shares of our common stock in this offering, the pro forma as adjusted net tangible book value of our common stock would increase to $            per share, representing an immediate increase to existing stockholders of $            per share and an immediate dilution of $            per share to new investors.

        The following table summarizes, on a pro forma as adjusted basis as of June 30, 2015, the difference between existing stockholders and the new investors with respect to the number of shares of common stock purchased, the total consideration paid and the average price per share paid. The table assumes that the initial public offering price will be $            , which is the midpoint of the price range set forth on the cover page of this prospectus.

        The share data in the table above is based on shares outstanding as of June 30, 2015, and excludes:

•

122,430 shares of common stock issuable upon exercise of stock options outstanding as of June 30, 2015, at a weighted average exercise price of $20.91 per share;



•

31,372 shares of common stock issuable upon the exercise of outstanding warrants as of June 30, 2015, at an exercise price of $9.55 per share;



•

5,727 shares of common stock issuable upon the exercise of outstanding warrants as of June 30, 2015, with a current exercise price of $43.64 per share. The warrant price will automatically adjust to a 10% premium to the conversion price of the convertible notes we issued from September 2014 through November 2014 during a mandatory conversion, defined in the notes as the occurrence of an equity financing of at least $2,000,000 in gross aggregate cash proceeds, in which the conversion price would be equal to $39.67 per share, as adjusted for capitalization changes; provided, however, if the initial public offering price is less than $39.67 per share, then the note conversion price will equal 75% of the initial public offering price; and



•

13,444 shares of common stock available for future grant under our 2013 Equity Compensation Plan as of June 30, 2015.

        If the underwriters' over-allotment option is exercised in full, the shares held by existing stockholders will decrease to        % of the total number of shares of common stock outstanding after the completion of this offering, and the number of shares held by new investors will increase to            , or        %, of the total number of shares of common stock outstanding after the completion of this offering.

        To the extent that options or warrants are exercised, new options or other securities are issued under our equity compensation plans, or we issue additional shares of common stock in the future, there will be further dilution to investors participating in this offering. In addition, we may choose to raise additional capital because of market conditions or strategic considerations, even if we believe that we have sufficient funds for our current or future operating plans. If we raise additional capital through the sale of equity or convertible debt securities, the issuance of these securities could result in further dilution to our stockholders.

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SELECTED CONSOLIDATED FINANCIAL DATA

        The following table presents selected consolidated financial data for the periods and at the dates indicated. The selected consolidated statements of operations data for the years ended December 31, 2013 and 2014 and the selected consolidated balance sheet data as of December 31, 2013 and 2014 have been derived from our audited consolidated financial statements, included elsewhere in this prospectus. The selected consolidated statements of operations data for the six months ended June 30, 2014 and 2015 and the selected consolidated balance sheet data as of June 30, 2015 have been derived from our unaudited consolidated financial statements included elsewhere in this prospectus. The unaudited consolidated financial data include, in the opinion of management, all adjustments, consisting of normal recurring adjustments, that are necessary for a fair statement of our financial position and results of operations for these periods. Our historical results for any prior period are not necessarily indicative of results to be expected in any future period, and our results for any interim period are not necessarily indicative of the results to be expected for a full fiscal year.

        You should read the following financial information together with the information under "Capitalization" and "Management's Discussion and Analysis of Financial Condition and Results of Operations" and our consolidated financial statements and the related notes included elsewhere in this prospectus.

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MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION
AND RESULTS OF OPERATIONS

        You should read the following discussion and analysis in conjunction with the information set forth in our consolidated financial statements and the notes to those statements included elsewhere in this prospectus. The statements in this discussion regarding our expectations of future performance, liquidity and capital resources, and other non-historical statements in this discussion are forward-looking statements. These forward-looking statements are subject to numerous risks and uncertainties, including, but not limited to, the risks and uncertainties described under "Risk Factors" and "Cautionary Note Regarding Forward-Looking Statements." Our actual results may differ materially from those contained in or implied by any forward-looking statements.

Overview

        We are a clinical stage biopharmaceutical company developing novel therapies for the management of pain and other central nervous system, or CNS, disorders. By focusing on this therapeutic area, we are addressing significant and growing markets where current treatment options are limited or inadequate. Our product candidate portfolio includes two late-stage candidates, AXS-02 and AXS-05, which we are developing for multiple indications. We recently initiated a Phase 3 trial with AXS-02 in complex regional pain syndrome and plan to initiate a Phase 3 trial in treatment resistant depression with AXS-05 in or before the first quarter of 2016. We aim to become a fully integrated biopharmaceutical company that develops and commercializes differentiated therapies that expand the treatment options available to caregivers and improve the lives of patients living with pain and other CNS disorders.

        We were incorporated in January 2012. Our operations to date have included organizing and staffing our company, business planning, raising capital, developing our compounds, and engaging in other discovery and preclinical activities. We have financed our operations to date primarily through private placements of our convertible notes. As of June 30, 2015, we have received aggregate gross proceeds of approximately $16.9 million from the sale of our convertible notes. During the year ended December 31, 2014, certain convertible notes converted into 465,329 shares of our common stock. Our ability to become profitable depends on our ability to generate revenue. We do not expect to generate significant revenue unless and until we or our collaborators obtain marketing approval for and successfully commercialize one of our product candidates.

        We have incurred significant operating and net losses since inception. We incurred net losses of $2.2 million, $6.0 million, and $4.3 million for the years ended December 31, 2013 and 2014 and the six months ended June 30, 2015, respectively. Our accumulated deficit as of June 30, 2015 was $12.5 million, and we expect to incur significant expenses and increasing operating losses for the foreseeable future. We expect our expenses to increase in connection with our ongoing activities, as we continue the development and clinical trials of, and seek regulatory approval for, AXS-02, AXS-05, and any other product candidates that we develop or in-license and advance to clinical development. If we obtain regulatory approval for a product candidate, we expect to incur significant expenses in order to create an infrastructure to support the commercialization of the product candidate, including manufacturing, sales, marketing, and distribution functions. Further, we expect to incur additional costs associated with operating as a public company. Accordingly, we will need additional financing to support our continuing operations. We will seek to fund our operations through public or private equity or debt financings or other sources. Adequate additional financing may not be available to us on acceptable terms, or at all. Our failure to raise capital as and when needed would have a negative impact on our financial condition and our ability to pursue our business strategy. We will need to generate significant revenue to achieve profitability, and we may never do so.

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        We believe that our existing cash as of June 30, 2015, together with the net proceeds of this offering, will enable us to continue operations through at least the third quarter of 2017. However, we will need to obtain substantial additional future funding in connection with our continuing operations.

Financial Overview

Revenue

        We have not generated any revenue since we commenced operations and we do not expect to generate any revenue in the near future. To the extent we enter into licensing or collaboration arrangements, we may have sources of revenue in the future. We expect that any revenue we generate will fluctuate from quarter to quarter as a result of the amount and timing of payments that we may recognize upon the sale of our product candidates, to the extent that any product candidates are successfully commercialized, and the amount and timing of fees, reimbursements, and milestone and other payments received under any future licensing or collaboration arrangements. If we fail to complete the development of our product candidates in a timely manner or obtain regulatory approval for them, our ability to generate future revenue, and our results of operations and financial position, would be materially and adversely affected.

Research and Development Expenses

        Research and development expenses primarily consist of costs incurred in performing research and development activities, including preclinical studies, clinical trials, manufacturing costs, employee salaries and benefits, stock-based compensation expense, contract services, including external research and development expenses incurred under arrangements with third parties, such as contract research organizations, or CROs, facilities costs, overhead costs, depreciation, and other related costs.

        Research and development activities are central to our business model. We will incur substantial costs beyond our present and planned clinical trials in order to file a new drug application, or NDA, for any of our product candidates. It is difficult to determine with certainty the costs and duration of our current or future clinical trials and preclinical studies, or if, when, or to what extent we will generate revenue from the commercialization and sale of our product candidates if we obtain regulatory approval. We may never succeed in achieving regulatory approval. The duration, costs, and timing of clinical trials and development of our product candidates will depend on a variety of factors, including the uncertainties of future clinical trials and preclinical studies, uncertainties in clinical trial enrollment rate, and significant and changing government regulation. In addition, the probability of success for each product candidate will depend on numerous factors, including competition, manufacturing capability, and commercial viability. We will determine which programs to pursue and how much to fund each program in response to the scientific and clinical success of each product candidate, as well as an assessment of each product candidate's commercial potential.

        The following table summarizes our research and development expenses by program for the years ended December 31, 2013 and 2014 and the six months ended June 30, 2014 and 2015:

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        Other research and development expenses primarily consist of employee salaries and benefits, facilities and overhead costs, and expenses for terminated programs.

General and Administrative Expenses

        General and administrative expenses primarily consist of salaries and related costs for personnel in executive, operational, and finance functions, including stock-based compensation and travel expenses. Other general and administrative expenses include facility-related costs, insurance expense, and professional fees for legal and accounting services and patent filing and prosecution costs. General and administrative expenses are expensed when incurred.

        We anticipate that our general and administrative expenses will increase in future periods as a result of increased payroll, expanded infrastructure, increased legal, compliance (such as maintaining compliance with stock exchange listing and Securities and Exchange Commission, or SEC, requirements), accounting, and investor and public relations expenses associated with being a public company, among other factors.

Interest and Amortization of Debt Discount/Premium (Expense) Income

        Interest and amortization of debt discount/premium (expense) income primarily consists of cash and non-cash interest costs related to our outstanding debt. We record costs incurred in connection with the issuance of debt as a direct deduction from the debt liability. We amortize these costs over the term of our debt agreements as interest expense in our consolidated statement of operations. In 2014, interest and amortization of debt discount/premium (expense) income also includes the amortization of the premium recognized due to extinguishment of debt.

Tax Credit

        The tax credit represents receipt of the New York City Biotechnology Tax Credit, or NYC Biotech credit, we received in 2014 related to our research and development expenses incurred for our product candidates.

Change in Fair Value of Warrant Liability

        The warrants to purchase our common stock issued to the placement agent in connection with our convertible notes issued in 2014 are classified as a warrant liability and recorded at fair value. This warrant liability is subject to re-measurement at each balance sheet date and we recognize any change in fair value in our statements of operations as a change in fair value of the warrant liability.

Change in Fair Value of Embedded Derivative Liabilities

        We issued convertible notes from September 2014 through June 2015 that included an embedded derivative that required bifurcation from the host debt instrument. We aggregated these bifurcated features and reflected the values of these embedded derivatives in the account "embedded derivative liabilities" which is subject to re-measurement at each balance sheet date and any change in fair value is recognized in our statements of operations as a change in fair value of the embedded derivative liabilities.

Loss on Extinguishment of Debt

        During June 2014, we amended our convertible notes issued from June 2013 through October 2013 in order to allow the notes to automatically convert into shares of common stock at maturity. The amendment was deemed to be a substantive change resulting in a loss on extinguishment of debt with an offsetting premium to the convertible notes.

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Critical Accounting Policies and Significant Judgments and Estimates

        This discussion and analysis of our financial condition and results of operations is based on our consolidated financial statements, which have been prepared in accordance with generally accepted accounting principles in the United States of America, or GAAP. The preparation of these consolidated financial statements requires us to make estimates and assumptions that affect the reported amounts of assets and liabilities, disclosure of contingent assets and liabilities at the date of the consolidated financial statements and the reported amounts of expenses during the reported period. In accordance with GAAP, we base our estimates on historical experience and on various other assumptions that we believe are reasonable under the circumstances. Actual results may differ from these estimates under different assumptions or conditions.

        While our significant accounting policies are more fully described in Note 3 to our audited consolidated financial statements appearing elsewhere in this prospectus, we believe the following accounting policies are the most critical to the judgments and estimates we use in the preparation of our consolidated financial statements.

Research and Development Expenses

        Research and development costs are expensed as incurred. Advance payments for goods or services for future research and development activities are deferred and expensed as the goods are delivered or the related services are performed. As part of the process of preparing our consolidated financial statements, we are required to estimate our accrued expenses. This process involves reviewing quotations and contracts, identifying services that have been performed on our behalf and estimating the level of service performed and the associated cost incurred for the service when we have not yet been invoiced or otherwise notified of the actual cost. The majority of our service providers invoice us monthly in arrears for services performed or when contractual milestones are met. We make estimates of our accrued expenses as of each balance sheet date in our consolidated financial statements based on facts and circumstances known to us at that time. We periodically confirm the accuracy of our estimates with the service providers and make adjustments if necessary. The significant estimates in our accrued research and development expenses are related to fees paid or payable to CROs and other vendors in connection with research and development activities for which we have not yet been invoiced.

        We base our expenses related to CROs on our estimates of the services received and efforts expended pursuant to quotes and contracts with CROs that conduct research and development on our behalf. The financial terms of these agreements are subject to negotiation, vary from contract to contract and may result in uneven payment flows. There may be instances in which payments made to our vendors will exceed the level of services provided and result in a prepayment of the research and development expense. In accruing service fees, we estimate the time period over which services will be performed and the level of effort to be expended in each period. If the actual timing of the performance of services or the level of effort varies from our estimate, we adjust the accrual or prepayment expense accordingly in the period in which the facts that give rise to the revision become known. Although we do not expect our estimates to be materially different from amounts actually incurred, our understanding of the status and timing of services performed relative to the actual status and timing of services performed may vary and could result in us reporting amounts that are too high or too low in any particular period.

Income Taxes

        Income taxes are accounted for under the asset and liability method. Under this method, deferred tax assets and liabilities are recognized for the future tax consequences attributable to the differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax bases, operating losses and tax credit carryforwards. Deferred tax assets and liabilities are measured

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using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled. The effect on deferred tax assets and liabilities of a change in tax rates is recognized in income in the period that includes the enactment date. Valuation allowances are provided if, based upon the weight of available evidence, it is more likely than not that some or all of the deferred tax assets will not be realized.

        We recognize the tax benefit from an uncertain tax position only if it is more likely than not to be sustained upon examination based on the technical merits of the position as well as consideration of the available facts and circumstances. When uncertain tax positions exist, we recognize the tax benefit of tax positions to the extent that the benefit will more likely than not be realized. As of June 30, 2015, we do not believe any material uncertain tax positions are present.

        As of December 31, 2014, we had federal and state net operating loss carryforwards of approximately $6.6 million which will begin expiring in 2033.

        Utilization of the net operating losses may be subject to a substantial annual limitation due to ownership change limitations provided by the Internal Revenue Code of 1986, as amended. The annual limitation may result in the expiration of our net operating losses before we can use them. We have recorded a valuation allowance on all of our deferred tax assets.

Stock-based compensation and fair market value of stock

        We issue stock-based awards to employees and non-employees, generally in the form of stock options. Prior to the consummation of this offering, we were a privately held company with no active public market of our common stock. Therefore, our board of directors has estimated the fair market value of our common stock at various dates, with input from management, considering our most recently available third-party valuations of common stock and the board's assessment of additional objective and highly subjective factors that it believed were relevant. Once a public trading market for our common stock has been established in connection with the closing of this offering, it will no longer be necessary for our board of directors to estimate the fair market value of our common stock in connection with our accounting for granted equity awards. In the absence of a public trading market for our common stock, we apply the fair value recognition provisions of the Financial Accounting Standards Board, or FASB, issued Accounting Standards Codification, or ASC, Topic 718, Compensation—Stock Compensation or ASC 718. ASC 718 requires all stock-based payments to employees and directors, including stock option grants and modifications to existing stock options, to be recognized in the statements of operations based on their fair market values. For awards subject to service-based vesting conditions, we recognize stock-based compensation expense on a straight-line basis over the requisite service period, which is generally the vesting term. For awards subject to performance-based vesting conditions, we recognize stock-based compensation expense using the accelerated attribution method when it is probable that the performance condition will be achieved. Non-employee awards are revalued at each reporting date until the awards vest.

        We use the Black-Scholes option-pricing model to determine the fair value of our stock options for accounting purposes. Use of this valuation methodology requires management to apply judgment and make estimates, including:

•

the volatility of our common stock;



•

the expected term of our stock options;



•

the risk-free interest rate for a period that approximates the expected term of our stock options;



•

the expected dividend yield; and



•

the fair market value of our common stock on date of grant.

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        These assumptions represented our best estimates, but the estimates involve inherent uncertainties and the application of our judgment. As a result, if factors change and we use significantly different assumptions or estimates when valuing our stock options, our stock-based compensation expense could be materially different. We recognize compensation expense for only the portion of awards that are expected to vest. In developing a forfeiture rate estimate for pre-vesting forfeitures, we have considered our historical experience of actual forfeitures. If our future actual forfeiture rate is materially different from our estimate, our stock-based compensation expense could be significantly different from what we have recorded in the current period.

        As a privately held company with a limited operating history, we used comparable public companies to estimate our expected stock price volatility. We selected companies from the biopharmaceutical industry with similar characteristics to ours including technology, enterprise value, and risk profile. We intend to continue to consistently apply this process using comparable companies until a sufficient amount of historical information regarding the volatility of our own share price becomes available. The expected term is based on the simplified method as described by the SEC's Staff Accounting Bulletin No. 107, Share-based Payment, to calculate the expected term of stock option grants to employees, as we do not have sufficient history to provide a reasonable basis upon which to make an estimate. The risk-free interest rate is based on the U.S. Treasury yield in effect at the time of grant for a period approximately equal to the expected term of the award. We utilize a dividend yield of zero, based on the fact that we have never paid cash dividends and have no current intention to pay cash dividends. If factors change and different assumptions are used, our stock-based compensation expense could be materially different in the future.

        As there has been no public market for our common stock to date, the estimated fair market value of our common stock has been determined contemporaneously by our board of directors utilizing independent third-party valuations prepared in accordance with the guidance outlined in the American Institute of Certified Public Accountants Practice Aid, Valuation of Privately-Held Company Equity Securities Issued as Compensation, also known as the Practice Aid for financial reporting purposes. The independent third-party valuations used the probability weighted expected return method, or PWERM, approach to allocate our equity value to our common stock. The PWERM approach employs various market, income, or cost approach calculations depending on the likelihood of various liquidation scenarios, with primary consideration given to the market and income approaches. The income approach estimates value based on the expectation of our future stream of cash flows and generally takes the form of either a discounted cash flow analysis based on projected operating results or a capitalization of free cash flow analysis. The market approach estimates value based on a comparison of our company to comparable public companies in a similar industry, stage of life cycle, and size. Enterprise values utilizing the PWERM approach were calculated based on three scenarios: an initial public offering, or IPO, exit scenario; a private round scenario; or a liquidation event. Each value was weighted based on the probability of each event's occurrence to arrive at an indicated enterprise value. In estimating the value of our common stock, management estimated a term for each of the scenarios.

        Total stock-based compensation expense was $0.1 million, $0.4 million, $0.3 million, and $0.3 million for the years ended December 31, 2013 and 2014 and the six months ended June 30, 2014 and 2015, respectively. As of June 30, 2015, we had $0.9 million of total unrecognized stock-based compensation expense, which we expect to recognize over a weighted average period of approximately 2.6 years. We expect the expense to grow in future periods due to the potential increases in the value of our common stock and headcount.

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Results of Operations

Comparison of the Six Months Ended June 30, 2014 and 2015

        The following table summarizes our results of operations for the six months ended June 30, 2014 and 2015:

        Research and Development Expenses.    Our research and development expenses for the six months ended June 30, 2015 were $3.0 million, compared to $1.6 million for the six months ended June 30, 2014, an increase of $1.4 million. The increase was primarily due to increased clinical trial, preclinical, and manufacturing expenses for our product candidate AXS-02, in addition to an increase in personnel in 2015.

        General and Administrative Expenses.    Our general and administrative expenses for the six months ended June 30, 2015 were $1.0 million, as compared to $0.4 million for the six months ended June 30, 2014, an increase of $0.6 million. The increase was primarily due to an increase in personnel and professional and intellectual property fees.

        Interest and Amortization of Debt Discount/Premium (Expense) Income.    Interest and amortization of debt discount/premium (expense) income for the six months ended June 30, 2015 was expense of $0.3 million, as compared to income of $0.5 million for the six months ended June 30, 2014, an increase in expense of $0.8 million. The increase was primarily due to incurring non-cash income of $0.9 million in June 2014 related to the amortization of debt premium associated with the June 2014 amendment of convertible notes. There was no non-cash income related to the amortization of debt premium incurred in 2015. In addition, in the six months ended June 30, 2015, we incurred a decrease of approximately $0.1 million in amortization and non-cash interest expense, as compared to the six months ended June 30, 2014, related to our outstanding convertible notes.

        Tax Credit.    During the six months ended June 30, 2014, we received the NYC Biotech credit of $0.2 million related to the research and development expenses of our product candidates. There was no tax credit received during the six months ended June 30, 2015.

        Change in Fair Value of Warrant Liability.    We recorded income related to the change in fair value of our warrant liability for the six months ended June 30, 2015. There was no warrant liability recorded for the six months ended June 30, 2014.

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        Change in Fair Value of Embedded Derivative Liabilities.    We recorded income related to the change in fair value of our embedded derivative liabilities of $0.1 million for the six months ended June 30, 2015. There was no embedded derivative liabilities recorded for the six months ended June 30, 2014.

        Loss on Extinguishment of Debt.    During June 2014, we amended our convertible notes issued from June 2013 through October 2013 in order to allow automatic conversion of the notes at maturity. The amendment was deemed to be a substantive change resulting in a $2.9 million loss on extinguishment of debt with an offsetting premium to the convertible notes. The premium was amortized on a pro rata basis attributable to the individual convertible note issuances through October 2014.

Comparison of the Years Ended December 31, 2013 and 2014

        The following table summarizes our results of operations for the years ended December 31, 2013 and 2014:

        Research and Development Expenses.    Our research and development expenses for the year ended December 31, 2014 were $4.3 million, compared to $1.5 million for the year ended December 31, 2013, an increase of $2.8 million. The increase was primarily due to increased clinical trial, preclinical, and manufacturing expenses for our two lead product candidates, AXS-02 and AXS-05, in addition to the hiring of personnel in 2014.

        General and Administrative Expenses.    Our general and administrative expenses for the year ended December 31, 2014 were $1.4 million, as compared to $0.3 million for the year ended December 31, 2013, an increase of $1.1 million. The increase was primarily due to an increase in intellectual property and professional fees.

        Interest and Amortization of Debt Discount/Premium (Expense) Income.    Interest and amortization of debt discount/premium (expense) income for the year ended December 31, 2014 was income of $2.2 million, as compared to interest expense of $0.3 million for the year ended December 31, 2013. The change of $2.5 million was due to incurring non-cash income of $2.9 million related to the amortization of debt premium associated with the June 2014 amendment of convertible notes issued from June 2013 through October 2013, partially offset by an increase of amortization and non-cash interest expense in 2014 related to our convertible notes.

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        Tax Credit.    In 2014, we received the NYC Biotech credit of $0.2 million related to the research and development expenses of our product candidates. No credit was received in 2013.

        Change in Fair Value of Warrant Liability.    We recorded expense related to the change in fair value of our warrant liability of $0.1 million for the year ended December 31, 2014. There was no warrant liability recorded for the year ended December 31, 2013.

        Change in Fair Value of Embedded Derivative Liabilities.    We recorded income related to the change in fair value of our embedded derivative liabilities of $0.2 million for the year ended December 31, 2014. There was no embedded derivative liabilities recorded for the year ended December 31, 2013.

        Loss on Extinguishment of Debt.    During June 2014, we amended our convertible notes issued from June 2013 through October 2013 in order to allow automatic conversion of the notes at maturity. The amendment was deemed to be a substantive change resulting in a $2.9 million loss on extinguishment of debt with an offsetting premium to the convertible notes. The premium was amortized on a pro rata basis attributable to the individual convertible note issuances through October 2014.

Liquidity and Capital Resources

        Since our inception, our operations have been financed primarily by proceeds from the sale of convertible notes, which as of June 30, 2015, amounted to aggregate gross proceeds of approximately $16.9 million. At June 30, 2015, we had cash of $6.4 million.

        To date, we have not generated any revenue and have incurred significant losses since our inception in 2012. As of June 30, 2015, we had an accumulated deficit of $12.5 million. We anticipate that we will continue to incur significant losses for the foreseeable future. We expect that our research and development and general and administrative expenses will continue to increase and, as a result, we will need additional capital to fund our operations, which we may seek to obtain through one or more equity offerings, debt financings, and licensing or collaboration arrangements.

Cash Flows

        The following table summarizes our sources and uses of cash:

        Operating Activities.    Net cash used in operating activities for the year ended December 31, 2014 was $4.6 million as compared to $1.6 million for the year ended December 31, 2013. The increase of $3.0 million in net cash used was primarily related to an increase in net loss of $3.8 million related to an increase in expenditures for our clinical programs and the hiring of personnel, which is partially offset by an increase in the amortization of the debt issuance costs and debt discounts on our convertible notes, along with an increase in stock compensation expense and accounts payable.

        Net cash used in operating activities for the six months ended June 30, 2015 was $3.3 million as compared to $1.4 million for the six months ended June 30, 2014. The increase of $1.9 million in net

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cash used was primarily related to an increase in expenditures for our clinical programs as well as an increase in general and administrative expenses in preparation for a potential IPO.

        Investing Activities.    Cash used in investing activities for the purchase of property and equipment was zero for the years ended December 31, 2013 and 2014 and for the six months ended June 30, 2014. Cash used in investing activities was less than $0.1 million for the six months ended June 30, 2015.

        Financing Activities.    Net cash provided by financing activities was $5.1 million for the year ended December 31, 2014 as compared to $3.7 million for the year ended December 31, 2013. The increase of $1.4 million was primarily related to an increase in net proceeds from the issuance of convertible notes in 2014.

        Net cash provided by financing activities was $7.1 million for the six months ended June 30, 2015 as compared to no cash provided by financing activities for the six months ended June 30, 2014. The increase of $7.1 million was due to proceeds received in the first half of 2015 related to convertible note issuances, whereas no fundraising was performed in the first half of 2014.

Amendment to Convertible Notes

        In September 2015, we and the holders of our outstanding convertible notes amended the terms of the notes to provide that the principal and any accrued and unpaid interest would automatically convert into shares of our common stock upon the occurrence of an equity financing of at least $2.0 million in gross aggregate cash proceeds at a conversion price equal to the applicable fixed conversion price for the notes; provided, however, if the lowest price per share at which our shares of equity securities are sold in such equity financing is less than the applicable fixed conversion price, then the note conversion price will equal 75% of lowest price per share at which our shares of equity securities are sold.

Plan of Operation

        We have not achieved profitability since our inception and we expect to continue to incur significant losses for the foreseeable future. We expect our losses to increase as we continue the development of and seek regulatory approvals for our product candidates and begin to commercialize any approved products. We are subject to all of the risks pertinent to the development of new product candidates, and we may encounter unforeseen expenses, difficulties, complications, delays, and other unknown factors that may harm our business. Upon the closing of this offering, we expect to incur additional costs associated with operating as a public company and we anticipate that we will need substantial additional funding in connection with our continuing operations.

        We believe that our existing cash as of June 30, 2015, together with the proceeds from this offering, will be sufficient to fund our business plan through at least the third quarter of 2017. However, we anticipate that we will need to raise substantial additional financing in the future to fund our operations. In order to meet these additional cash requirements, we may incur debt, license certain intellectual property, and seek to sell additional equity or convertible securities that may result in dilution to our stockholders. If we raise additional funds through the issuance of equity or convertible securities, these securities could have rights or preferences senior to those of our common stock and could contain covenants that restrict our operations. There can be no assurance that we will be able to obtain additional equity or debt financing on terms acceptable to us, if at all. Our future capital requirements will depend on many factors, including:

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the scope, rate of progress, results, and cost of our clinical studies and other related activities;



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our ability to enter into collaborative agreements for the development and commercialization of our product candidates;



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the number and development requirements of any other product candidates that we pursue;

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•

the costs, timing, and outcome of regulatory reviews of our product candidates;



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the costs and timing of future commercialization activities, including product manufacturing, marketing, sales, and distribution, for any of our product candidates for which we receive marketing approval;



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any product liability or other lawsuits related to our product candidates;



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the expenses needed to attract and retain skilled personnel;



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the general and administrative expenses related to being a public company;



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the revenue, if any, received from commercial sales of our product candidates for which we receive marketing approval; and



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the costs involved in preparing, filing, and prosecuting patent applications, maintaining and enforcing our intellectual property rights, and defending our intellectual property-related claims.

        Please see "Risk Factors" for additional risks associated with our substantial capital requirements.

Contractual Obligations and Commitments

        The following is a summary of our contractual obligations as of December 31, 2014:

        Under three exclusive license agreements with Antecip Bioventures II LLC, or Antecip, an entity owned by our Chief Executive Officer and Chairman of the Board, Herriot Tabuteau, M.D., we are obligated to make specified royalty payments ranging from 1.5% to 4.5%, subject to up to a 50% reduction depending on required payments to third parties, on net sales of licensed products. We have not included in the table above any payments to Antecip under these license agreements as the amount, timing, and likelihood of such payments are not known. For a more detailed description of these agreements, please see "Business—Material License Agreements."

Off-Balance Sheet Arrangements

        We do not have any off-balance sheet arrangements, as defined by applicable SEC regulations.

Quantitative and Qualitative Disclosures about Market Risk

Interest Rate Risk

        We are exposed to market risks in the ordinary course of our business. These market risks are principally limited to interest rate fluctuations. We had cash of $6.4 million as of June 30, 2015. The primary objective of our investment activities is to preserve principal and liquidity while maximizing income without significantly increasing risk. We do not enter into investments for trading or speculative purposes. Due to the short-term nature of our investment portfolio, we do not believe an immediate 10% increase in interest rates would have a material effect on the fair market value of our portfolio,

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and, accordingly, we do not expect our operating results or cash flows to be materially affected by a sudden change in market interest rates.

Foreign Currency Exchange Risk

        We contract with vendors and third-party manufacturers in several foreign countries. Several of these contracts are denominated in Euros and British pounds. We are therefore subject to fluctuations in foreign currency rates in connection with these agreements, and recognize foreign exchange gains or losses in our statement of operations. We have not historically hedged our foreign currency exchange rate risk. To date, we have not incurred any material effects from foreign currency changes on these contracts.

        A 10% change in these currencies on June 30, 2015 would not have had a material effect on our results of operations or financial condition.

Inflation Risk

        Inflation generally affects us by increasing our cost of labor and pricing of contracts. We do not believe that inflation has had a material effect on our business, financial condition or results of operations during the year ended December 31, 2014 or the six months ended June 30, 2015.

JOBS Act

        Under the JOBS Act, emerging growth companies, like us, that become publicly traded companies can delay adopting new or revised accounting standards, until such time as those standards apply to private companies. We have irrevocably elected to not take advantage of the extended transition period afforded by the JOBS Act for the implementation of new or revised accounting standards and, as a result, will comply with new or revised accounting standards on the relevant dates on which adoption of such standards is required for non-emerging growth companies.

Recent Accounting Pronouncements

        In April 2015, the FASB issued Accounting Standards Updates ("ASU") 2015-03, Interest—Imputation of Interest (Subtopic 835-30). The update requires debt issuance costs related to a recognized debt liability to be presented in the balance sheet as a direct deduction from the debt liability rather than as an asset. The guidance is effective for fiscal years beginning after December 15, 2015. We early adopted this guidance for all periods presented.

        In August 2014, the FASB issued ASU 2014-15, Presentation of Financial Statements—Going Concern (Subtopic 205-40), which requires management of an entity to evaluate whether there are conditions or events, considered in the aggregate, that raise substantial doubt about the entity's ability to continue as a going concern within one year after the date that the financial statements are issued or available to be issued. The guidance is effective for fiscal years ending after December 15, 2016. Early adoption is permitted. We expect to adopt this guidance when effective and are currently evaluating the effect that the updated standard will have on our financial statements and related disclosures.

        On June 10, 2014, the FASB issued ASU 2014-10, Development Stage Entities (Topic 915). The update removes the definition of a development stage entity from FASB ASC 915 and eliminates the requirement for development stage entities to present inception-to-date information on the statements of operations, cash flows, and stockholders' deficit. We early adopted this guidance in this and all subsequent reporting periods.

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BUSINESS

Overview

        We are a clinical stage biopharmaceutical company developing novel therapies for the management of pain and other central nervous system, or CNS, disorders. By focusing on this therapeutic area, we are addressing significant and growing markets where current treatment options are limited or inadequate. Our product candidate portfolio includes two late-stage candidates, AXS-02 and AXS-05, which we are developing for multiple indications. We recently initiated a Phase 3 trial with AXS-02 in complex regional pain syndrome and plan to initiate a Phase 3 trial with AXS-05 in treatment resistant depression in or before the first quarter of 2016. We aim to become a fully integrated biopharmaceutical company that develops and commercializes differentiated therapies that expand the treatment options available to caregivers and improve the lives of patients living with pain and other CNS disorders.

        Our first product candidate, AXS-02 (disodium zoledronate tetrahydrate), is a potentially first-in-class, oral, targeted, non-opioid therapeutic for chronic pain. AXS-02 is a potent inhibitor of osteoclasts, which are bone remodeling cells that break down bone tissue. We are initially developing AXS-02 for the treatment of pain in the following three conditions: complex regional pain syndrome, or CRPS; knee osteoarthritis, or OA, associated with bone marrow lesions, or BMLs; and chronic low back pain, or CLBP, associated with type 1 or mixed type 1 and type 2 Modic changes, or MCs. These conditions exhibit target lesions or specific pathology that we believe may be addressed by the mechanisms of action of AXS-02, such as inhibition of osteoclast activity. These mechanisms may result in a reduction of pain in these conditions. We have successfully completed a Phase 1 trial of AXS-02 to characterize the pharmacokinetics of zoledronic acid and its effects on markers of bone resorption after oral administration of AXS-02. The results of our Phase 1 trial demonstrated that oral administration of AXS-02 tablets resulted in rapid absorption of zoledronic acid, which is the active molecule in AXS-02 and the free acid form of disodium zoledronate tetrahydrate, and substantial suppression of bone resorption markers, which are proteins indicative of bone tissue breakdown. We selected the dose for our ongoing and planned Phase 3 trials based on the pharmacokinetic and pharmacodynamic results of our Phase 1 trial. We intend to seek U.S. Food and Drug Administration, or FDA, approval for AXS-02 utilizing the 505(b)(2) regulatory development pathway.

        We initiated a Phase 3 trial with AXS-02 for the treatment of pain in patients with CRPS, which we refer to as the CREATE-1 study, in July 2015. There is currently no drug approved by the FDA or the European Medicines Agency, or EMA, to treat CRPS. CRPS is a debilitating condition characterized by severe pain in a limb, accompanied by autonomic, sensory, motor, and trophic changes. For many patients, the pain and associated loss of function result in significant and sometimes permanent disability. AXS-02 has been granted FDA Fast Track designation for the treatment of pain associated with CRPS. AXS-02 has also been granted Orphan Drug Designation by the FDA and Orphan Medicinal Product Designation by the EMA for the treatment of CRPS. It has been estimated that approximately 80,000 individuals in the United States are diagnosed with CRPS annually.

        We plan to initiate a Phase 3 clinical trial with AXS-02 for the treatment of pain in patients with knee OA associated with BMLs in or before the first quarter of 2016. There is currently no therapy specifically approved by the FDA or the EMA to treat this subset of knee OA. Results from cross-sectional and longitudinal studies have shown an association between the presence of BMLs and knee pain in patients with knee OA. These studies suggest that BMLs are a source of knee pain and a potential target for pharmaceutical intervention. We believe the mechanisms of action of AXS-02 may preferentially target BMLs. We estimate that as many as 7 million individuals in the United States suffer from symptomatic knee OA associated with BMLs.

        We plan to initiate a Phase 3 clinical trial with AXS-02 for the treatment of CLBP associated with MCs in the first half of 2016. There is currently no therapy specifically approved by the FDA or the

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EMA to treat this subset of CLBP. Results of numerous studies suggest that MCs, especially type 1 MCs, are correlated with low back pain, and that changes in the extent of type 1 MCs are positively associated with changes in low back symptoms. These studies suggest that MCs are a potential target for pharmaceutical intervention. We believe the mechanisms of action of AXS-02 may preferentially target MCs. We estimate that as many as 1.6 million individuals in the United States suffer from CLBP associated with type 1 MCs.

        Our second product candidate, AXS-05, is an innovative fixed-dose combination of dextromethorphan, or DM, and bupropion. We are developing AXS-05 initially for the treatment of the following two conditions: treatment resistant depression, or TRD; and agitation in patients with Alzheimer's disease, or AD. DM is active at multiple CNS receptors but is rapidly and extensively metabolized in humans. As a result, it is difficult to attain potential therapeutic plasma levels of DM when it is dosed as a single agent. AXS-05 uses bupropion as a novel drug delivery method to inhibit DM metabolism and increase its bioavailability. We have demonstrated in two Phase 1 trials that DM plasma levels are substantially increased into a potentially therapeutic range with the co-administration of bupropion. Bupropion is itself active at distinct CNS receptors providing the potential for an additive or synergistic effect. We intend to seek FDA approval for AXS-05 utilizing the 505(b)(2) regulatory development pathway.

        We plan to initiate a Phase 3 trial of AXS-05 in TRD in or before the first quarter of 2016. Currently only one product, Symbyax, a combination of olanzapine and fluoxetine, which is marketed by Eli Lilly and Company, is approved in the United States for the treatment of TRD. DM's mechanisms of action encompass those of several antidepressant drug classes, and bupropion is a well-established antidepressant. DM administration has resulted in dose-dependent antidepressant-like effects in two widely used preclinical models of antidepressant effect. Furthermore, administration of DM with quinidine, which serves as an inhibitor of metabolism of DM, resulted in a statistically significant reduction in depressive symptoms in patients with pseudobulbar affect, which is a disorder characterized by involuntary, sudden, and frequent episodes of laughing or crying, as shown in a third-party study. The plasma concentrations of DM achieved with AXS-05 in our Phase 1 trials are in the range of those associated with the DM and quinidine dose that resulted in a reduction in depressive symptoms in patients with pseudobulbar affect, based on data published by the FDA. We estimate that as many as 3 million individuals in the United States suffer from TRD.

        We intend to develop AXS-05 for the treatment of agitation in patients with AD, and plan to request a meeting with the FDA in 2016 to discuss our development plans. There is currently no FDA-approved pharmacological treatment for the indication of agitation in patients with AD. Agitation in patients with AD has been associated with increased caregiver burden, decreased functioning, earlier nursing home placement, and death. Administration of DM with quinidine has been shown to result in a statistically significant reduction of agitation in patients with probable AD, as shown in a randomized, double-blind, placebo-controlled, third-party clinical trial. The plasma concentrations of DM achieved with AXS-05 in our Phase 1 trials are in the range of those associated with the DM and quinidine doses that resulted in a reduction in agitation in patients with probable AD, based on data published by the FDA. It has been estimated that AD afflicts 5 million individuals in the United States, with agitation being reported in as many as 40% of those afflicted.

        We have one active program, AXS-06, in preclinical development. We are developing AXS-06 for the treatment of chronic pain disorders.

        Our product candidates are protected through a combination of patents, trade secrets, and proprietary know-how. If approved, they may also be eligible for periods of regulatory exclusivity. Our intellectual property portfolio includes U.S. patents with claims extending to 2034 for AXS-02 and AXS-05, as well as corresponding foreign patent applications. Our U.S. and E.U. orphan designations

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for AXS-02 for the treatment of CRPS potentially provide 7 and up to 12 years of marketing exclusivity in the respective geographies for the orphan indication.

Our Strategy

        Our goal is to cost-effectively and efficiently develop and commercialize novel, differentiated therapies for the management of pain and other CNS disorders. The primary elements of our strategy to achieve this goal are the following:

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Pursue novel pain and other CNS indications with high unmet medical need.  We believe that pain and other CNS disorders are significantly underserved therapeutic segments with currently limited treatment options. We are initially developing our product candidates for indications that have no or few FDA-approved pharmacological treatments. For example, there currently is no drug approved by the FDA or the EMA for CRPS, the pain of knee OA associated with BMLs, CLBP associated with MCs, or agitation in patients with AD. There is currently only one FDA-approved drug for TRD. These conditions are often disabling, difficult to treat, and associated with significant comorbidities. By focusing on novel indications, we aim to develop products that have the potential to change current medical practice, and that are highly relevant to patients, physicians, and regulatory bodies because they address unmet medical needs. Many of these indications have significant patient populations which, when combined with the lack of approved treatments, should provide us with attractive commercial opportunities.



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Use biomarkers to define specific patient subsets for our pain indications.  We are using biomarkers, such as BMLs and MCs, which are visible on magnetic resonance imaging, or MRI, to define specific subsets of patients who we believe are more likely to respond to the mechanisms of action of AXS-02. Biomarkers have been used successfully in connection with oncology treatments, but are not commonly used with pain therapeutics. While patients with common pain conditions, such as knee OA and CLBP, experience similar symptoms, these symptoms may be due to different underlying conditions. We believe that the variability in underlying conditions contributes to heterogeneity in these populations and may account for observed differences in treatment response. We believe that our targeted biomarker approach may result in a less heterogeneous patient population in our clinical trials, which may improve our ability to demonstrate a treatment effect and, if approved, enable treatment of more appropriate patient populations with our product candidates.



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Develop products with differentiated profiles.  We aim to develop products with novel mechanisms of action for the intended indications that may yield differentiated product profiles. For example, AXS-02 utilizes a potentially first-in-class mechanism of action for the treatment of pain that may result in analgesia that lasts for one or more months after treatment. AXS-05 combines several mechanisms of action resulting in a unique pharmacological profile that may be relevant to the treatment of numerous CNS disorders. We believe that products with clearly differentiated features will be attractive to patients and their physicians, and will provide us with a competitive commercial advantage.



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Reduce clinical and regulatory risk, limit development costs, and accelerate time to market.  Our product candidates incorporate chemical entities with long histories of clinical use and well-characterized safety profiles. Use of well-characterized molecules has allowed us to rapidly complete early clinical development of our product candidates, and may reduce the risk of late-stage clinical failures due to unexpected toxicities. This strategy also allows us to seek FDA approval for our product candidates using the 505(b)(2) regulatory pathway. Section 505(b)(2) of the Federal Food, Drug, and Cosmetic Act, or FDCA, permits an applicant to file a new drug application, or NDA, that relies, in part, on the FDA's prior findings of safety and efficacy in the approval of a similar drug, or on published literature. It therefore allows us to leverage previous

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preclinical and clinical experience with the active molecules in our product candidates and potentially forego conducting certain lengthy and costly preclinical studies, reduce clinical and regulatory risk, limit development costs, and accelerate our time to commercialization.

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Retain commercial rights in the United States, where appropriate, and selectively partner outside of the United States to maximize the value of our product candidates.  We intend to commercialize AXS-02, if approved, in the United States through the establishment of our own focused, cost-effective sales and marketing organization targeting high-prescribing specialists. We intend to selectively partner commercial rights outside of the United States with third parties to maximize the value of AXS-02 without the substantial investment required to develop independent sales forces in those geographies. We continue to evaluate strategic options for the commercialization of our other product candidates.

Our Pipeline

        Our current product candidate pipeline is summarized in the table below:

AXS-02

Overview

        AXS-02 is a novel, targeted investigational pain therapeutic. It is an orally administered, non-opioid agent with a new mechanism of action for the treatment of pain. We are developing AXS-02 for the treatment of pain associated with CRPS, a severe and debilitating orphan condition. No drug is currently approved by the FDA or the EMA to treat CRPS. We are also developing AXS-02 for the treatment of the pain of knee OA associated with BMLs, and for the treatment of CLBP associated with MCs. No drug is currently approved by the FDA or the EMA specifically for these targeted subsets of knee OA and CLBP.

        We believe that, if successfully developed, AXS-02 may overcome many of the limitations of current treatments for pain, and may be attractive to patients and their physicians, based on the following differentiating features:

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Novel osteoclast-inhibiting mechanism of action for the treatment of pain



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Targeted therapy approach that utilizes radiographic biomarkers to identify appropriate patients



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Oral administration

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Convenient weekly dosing and short course of treatment



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Potential for extended duration of pain relief



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Lack of opioid-related side effects and abuse and addiction potential

        We initiated a Phase 3 trial with AXS-02 for the treatment of pain associated with CRPS in July 2015. We plan to initiate Phase 3 trials with AXS-02 for the treatment of the pain of knee OA associated with BMLs in or before the first quarter of 2016, and for the treatment of CLBP associated with MCs in the first half of 2016.

Novel Mechanisms of Action for Pain

        Zoledronic acid, the active molecule in AXS-02, is a potent nitrogen-containing bisphosphonate. Bisphosphonates are compounds that bind with high affinity to bone mineral and inhibit the bone-resorbing cells called osteoclasts. Zoledronic acid reduces osteoclast activity by inhibiting a critical enzyme called farnesyl pyrophosphate synthase, or FPPS. Zoledronic acid is the bisphosphonate with the strongest affinity for bone and the highest inhibitory activity of FPPS. Osteoclasts resorb bone by secreting protons and generating an acidic extracellular microenvironment. The secreted protons may directly excite pain receptors, which are found in mineralized bone. We believe that zoledronic acid may therefore reduce pain by inhibiting osteoclast hyperactivity and suppressing the up-regulation of acid-sensing ion channels on sensory neurons. Zoledronic acid has also been shown to inhibit the production of pro-inflammatory cytokines and to have anti-angiogenic properties.

Targeted Therapy for Pain

        We are developing AXS-02 for specific subsets of patients who display certain target lesions or specific pathology that we believe may be addressed by the mechanisms of action of our product candidate. The target lesions include regional osteoporosis, BMLs, and MCs. In order to select for CRPS patients with target lesions, such as regional osteoporosis, we plan to include only patients whose condition was precipitated by traumatic injury in our registration trials for CRPS. We plan to include only patients with BMLs in our registration trials of AXS-02 for the pain of knee OA, and only patients with MCs in our registration trials of AXS-02 for CLBP. These target lesions exhibit increased bone turnover, which is potentially inhibited by zoledronic acid. Furthermore, because zoledronic acid localizes preferentially to sites of high bone turnover, we believe it may specifically target these sites of disease activity in CRPS, knee OA, and CLBP. We believe that this targeted approach may result in a less heterogeneous patient population in our clinical trials, improve our ability to demonstrate a treatment effect, and, if approved, enable treatment of more appropriate patient populations.

Orally Administered

        AXS-02 is a novel oral formulation of zoledronic acid. Zoledronic acid is currently marketed only as an intravenous, or IV, preparation and is not currently approved for the treatment of pain. Our oral formulation uses a disodium salt of zoledronic acid, which exhibits substantially improved solubility as compared to the diacid form. This improved solubility may facilitate oral absorption.

        Oral administration is non-invasive, less costly, more convenient, and less burdensome to patients and prescribers as compared to IV dosing. Oral administration provides greater prescribing flexibility for clinicians and convenience for patients since it allows them to self-administer the therapy at home and avoid having to travel to and from a hospital or infusion facility. Additionally, based on clinical experience with currently approved bisphosphonates, oral administration of zoledronic acid may have certain safety advantages as compared to IV dosing.

        In a recent trial of 6,097 patients treated over 3 years who received either IV zoledronic acid therapy or oral therapy with alternative bisphosphonates, 76% and 73% of patients indicated a

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preference for oral versus IV formulations if all agents showed equal efficacy at randomization and therapy completion, respectively.

Infrequent Dosing and Convenient Regimen

        The potency and pharmacokinetics of zoledronic acid may allow for very infrequent dosing and for a short and convenient treatment regimen. Based on the results of our Phase 1 trial, we are currently dosing AXS-02 once weekly for 6 weeks in our Phase 3 trial for the treatment of pain associated with CRPS. Because of its convenient administration and limited treatment duration, we believe that AXS-02, if successfully developed, may improve compliance and be preferred by patients and their physicians over currently available treatments.

Extended Pain Relief

        AXS-02 may provide pain relief of long duration based on results of trials conducted with IV-administered zoledronic acid. In trials in patients with knee OA associated with BMLs and CLBP associated with MCs, treatment with IV-administered zoledronic acid resulted in pain relief that was measurable one or more months after cessation of treatment. For example, pain reduction as compared to placebo was demonstrated 6 months after treatment in knee OA, and 1 month after treatment in CLBP. Furthermore, 1 year after treatment, a statistically significant reduction was observed in the percentage of zoledronic acid-treated patients with CLBP who were taking non-steroidal anti-inflammatory drugs, or NSAIDs, as compared to placebo-treated patients. This observed extended pain reduction may be related to the potency of zoledronic acid and its long residence time in bone.

Lack of Opioid-related Side Effects and Abuse and Addiction Potential

        Reflecting the currently limited treatment options for chronic pain, opioid medications are widely prescribed despite their numerous significant undesirable side effects and potential consequences. These side effects and consequences include dependency, addiction and abuse potential, respiratory depression, hypotension, constipation, and a higher incidence of falls and fractures in older patients. Prescription opioids are also increasingly associated with deaths from unintentional overdose, with over 16,000 deaths reported in the United States each year.

        AXS-02 exerts its potential effects for the treatment of pain via novel non-opioid mechanisms of action. If successfully developed, AXS-02 would represent an alternative treatment for pain that lacks the addiction and abuse potential and other serious side effects of opioids.

Complex Regional Pain Syndrome (CRPS)

        We are developing AXS-02 for the treatment of pain associated with CRPS. There is currently no drug approved by the FDA or the EMA for the treatment of CRPS. AXS-02 has been granted Orphan Drug Designation by the FDA and Orphan Medicinal Product Designation by the EMA for the treatment of CRPS. The FDA has also granted Fast Track designation for AXS-02 for the treatment of pain associated with CRPS.

Indication Overview

        CRPS is a disorder characterized by severe, continuous, disabling pain in a limb accompanied by autonomic, sensory, motor, and skin and nail changes. The sensory changes, including allodynia, which is pain invoked by normally non-painful tactile stimuli, and hyperalgesia, which is greater than normal pain from painful stimuli, are accompanied by movement disorders and joint stiffness. These symptoms are initially confined to a specific limb but can spread beyond the affected limb. Radiographic examination using plain x-ray, three-phase bone scan, or MRI often reveal evidence of increased bone turnover in the affected limb.

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        The disorder impairs daily functioning and negatively impacts quality of life. For many patients, the pain and associated loss of function result in significant and sometimes permanent disability. Depression is a common comorbidity. CRPS is often triggered by minor trauma, such as wrist fracture, surgery or needle stick injury, but can occur spontaneously. The extreme nature of the pain is disproportionate to these inciting events. Fracture of the wrist or ankle are the most common inciting events. The disorder affects women 3 to 4 times as frequently as men and its prevalence increases with age. The pathophysiology of CRPS is thought to be multi-factorial and may include a localized increase in bone turnover, aberrant inflammatory mechanisms, vasomotor dysfunction, and maladaptive neuroplasticity.

        Diagnosis of CRPS is made using the International Association for the Study of Pain, or IASP, criteria. It is based on the presence of pain and its characteristics, and the presence of other signs and symptoms. CRPS type 1 is diagnosed if the criteria are seen without evidence of major nerve damage. If seen in the presence of major nerve damage, CRPS type 2, formerly known as causalgia, is diagnosed. CRPS type 1, formerly known as reflex sympathetic dystrophy, or RSD, is estimated to account for approximately 97% of all CRPS cases.

        It is estimated that there are approximately 80,000 new cases of CRPS in the United States annually. Spontaneous remission is common in some patients. Currently, no medicinal product is approved in either the United States or the European Union for the treatment of CRPS. In addition, current methods for the treatment of pain associated with CRPS are not considered satisfactory. Medicines used for more common pain conditions, such as opioids, NSAIDs, and neuropathic pain medications, are considered to be largely ineffective in CRPS, as demonstrated by controlled trials. Consequently, invasive and expensive palliative interventions, such as IV sympathetic blockades and surgical sympathectomy, are often used with their attendant risk of significant complications. Due to the resistance of the condition to medical therapy, amputation of the affected limb is sometimes performed for the relief of pain.

Rationale for the Use of AXS-02 in CRPS

        The rationale for the use of AXS-02 for the treatment of pain associated with CRPS is supported by the pharmacological action of AXS-02, demonstrated in our Phase 1 clinical trial, which addresses a common pathophysiological finding in CRPS-affected limbs, and by positive results in a well-validated animal study of CRPS.

        Clinical rationale.    Increased bone resorption is seen in the affected limbs of the majority of CRPS patients and is manifested by increased tracer uptake on three-phase bone scan, regional osteoporosis visible on plain x-ray, and bone marrow edema visible on MRI. Bisphosphonate compounds, such as zoledronic acid, are inhibitors of bone resorption. Bone resorption occurs when bone breaks down and releases minerals into the blood. In our completed Phase 1 trial, oral administration of AXS-02 to healthy human volunteers resulted in substantial reductions in markers of bone resorption. For example, a single oral administration of AXS-02 at varying doses resulted in an 80% to 90% reduction in serum CTx, a standard marker of bone resorption, suggesting the potential for AXS-02 to address a common pathophysiological finding in CRPS-affected limbs. Furthermore, zoledronic acid localizes preferentially to regions of high bone turnover suggesting it may be able to preferentially target CRPS-affected limbs. Results of several small clinical trials with other less potent bisphosphonate compounds have shown a reduction in pain in CRPS patients treated with these agents. The pharmacological effect of AXS-02 shown in our Phase 1 trial may therefore translate to a clinical benefit in CRPS patients.

        Effects of AXS-02 in the rat tibia fracture model of CRPS.    The effect of AXS-02 was examined in the rat tibia fracture model of CRPS. This well-validated animal model has been shown to replicate the inciting trauma, natural history, signs, symptoms, and pathologic changes observed in human CRPS

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patients. We conducted a study with AXS-02 in this model. After baseline tests, 20 rats underwent a right distal tibia fracture with casting to induce CRPS-like symptoms and signs. Animals were then orally administered either placebo or AXS-02 in a dosage of 3 mg/kg/day for 28 days, starting the day after fracture and casting. The casts were removed on the 28th day after fracture, and on the following day, bilateral testing of hindpaw pain thresholds, weight bearing, thickness, and temperature was performed. Hindpaw temperature and thickness data were analyzed as the difference between the affected hindpaw and the normal hindpaw. Weight-bearing data were analyzed as the ratio between the affected and the normal hindpaw. Weight bearing is a functional measure of pain since the animal is expected to shift its weight off the painful limb. Hindpaw thickness was measured to assess edema, commonly known as swelling. Hindpaw temperature was measured to assess warmth, a symptom of CRPS.

        Oral administration of AXS-02 resulted in a statistically significant reduction in pain, improvement in weight bearing, and prevention of edema as compared to placebo in the rat tibia fracture model of CRPS. As summarized in the figure below, treatment with AXS-02 reduced pain by 77% and edema by 60% as compared to placebo treatment. AXS-02 treatment also resulted in a 56% improvement in weight bearing as compared to placebo. The study did not find an effect of AXS-02 on hindpaw temperature. P values shown below are for AXS-02 versus placebo. An experimental result, such as those derived from a clinical or non-clinical study, is statistically significant if it is unlikely to have occurred by chance. The statistical significance of experimental results is determined by a widely used statistical method that establishes the P value of the results. A P value is a statistical measure of the probability that the difference in results between treatment and control groups in a study could have occurred by chance. Under this method, the smaller the P value the greater the confidence that the results are significant, and a P value of 0.05 or less is generally considered by the FDA to represent statistical significance.

Effect of AXS-02 in the rat tibia fracture model of CRPS

        We conducted a second study using the same rat tibia fracture model. In this study, the animals underwent tibia fracture and casting as described above, but dosing of AXS-02 was started following cast removal and continued for a duration of three weeks. Oral administration of AXS-02 resulted in a statistically significant reversal of pain and improvement in weight bearing as compared to placebo. Treatment with AXS-02 reversed pain by approximately 100% versus baseline and improved weight bearing by approximately 13% as compared to placebo. The study did not find an effect of AXS-02 on edema or hindpaw temperature.

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Knee Osteoarthritis (OA) Associated with Bone Marrow Lesions (BMLs)

        We are developing AXS-02 for the treatment of the pain of knee OA associated with BMLs. There is currently no therapy specifically approved by the FDA or the EMA to treat this subset of knee OA.

Indication Overview

        Knee OA is a disorder characterized by periarticular bone changes, progressive loss of articular cartilage, joint space narrowing, and eventual total joint failure. It is clinically manifested by knee pain, significant physical disability, and reduced quality of life. While currently available drug therapies attempt to address the pain of knee OA, they are not thought to address the cause of the pain.

        Recently, BMLs have been recognized as an important feature of knee OA because of their relation to the pain and pathogenesis of the condition. BMLs appear as areas of increased signal intensity on MRI of the knee, and represent regions of increased subchondral bone turnover. BMLs are clinically relevant because they are associated with and predict knee pain, disease severity, and structural progression in patients with knee OA, based on published studies. Findings from several cross-sectional and longitudinal studies have demonstrated that (1) BMLs are strongly associated with the presence and severity of pain in patients with knee OA, (2) new or enlarging BMLs are associated with increased pain and diminishing BMLs with decreased pain, (3) BMLs are associated with progression of joint space narrowing and cartilage loss, (4) BMLs predict knee joint replacement, and (5) increasing BML size is associated with cartilage loss. These studies therefore suggest that BMLs are a source of knee pain and a potential target for pharmaceutical intervention.

        There is currently no therapy specifically approved by the FDA or the EMA to treat the pain of knee OA associated with BMLs. Currently available therapy for the broader knee OA population include non-pharmacological treatments, oral and topical medications, and intra-articular injections. Non-pharmacological approaches include exercise, weight management, strength training, self-management, and education. Oral treatments include acetaminophen, selective and non-selective NSAIDs, and opioid medications. Intra-articular injections for knee OA include intra-articular hyaluronic acid, or IAHA, and intra-articular corticosteroids, or IACS. These treatments are generally short-acting and may address the symptoms of knee OA, but are not thought to have an effect on the underlying cause of the condition. Knee joint replacement surgery is viewed as a last resort for patients who, despite pharmacological and non-pharmacological treatment, do not have adequate pain relief and functional improvement.

        Results of epidemiological studies suggest that there are approximately 25 million patients in the United States, 50 years of age and older, with radiographic knee OA. Approximately 12 million of these patients are estimated to be symptomatic, 7 million of whom we estimate have BMLs.

Rationale for the Use of AXS-02 in the Pain of Knee OA Associated with BMLs

        The rationale for utilizing AXS-02 for the treatment of the pain of knee OA associated with BMLs is based on the observations that (1) BMLs are strongly associated with pain in knee OA, (2) BMLs represent regions of increased subchondral bone turnover and reduced mineral content based on studies of BMLs resected from human subjects, and (3) zoledronic acid potently inhibits bone turnover, increases bone mineral density, and localizes preferentially to regions of increased bone turnover. The pharmacological actions of zoledronic acid therefore suggest the potential for AXS-02 to affect BMLs, thereby reducing pain in patients with knee OA associated with BMLs.

Chronic Low Back Pain (CLBP) Associated with Modic Changes (MCs)

        We are developing AXS-02 for the treatment of CLBP associated with MCs. There is currently no therapy specifically approved by the FDA or the EMA to treat this subset of CLBP.

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Indication Overview

        CLBP is defined as persistent or fluctuating low back pain lasting at least three months. It is a disabling and costly condition that is associated with increased healthcare utilization. The economic costs of CLBP are estimated to range from $12.2 billion to $90.6 billion annually in the United States. Factors that contribute to this economic impact include prolonged loss of function, consequent loss of work productivity, treatment costs, and disability payments. Low back pain may be due to a specific cause such as fracture, tumor, infection, or nerve root compression. However it is estimated that in more than 85% of cases such specific causes cannot be identified, resulting in the majority of cases being classified as non-specific.

        Recently, it has been suggested that patients with MCs may represent a specific clinical subgroup of CLBP patients. MCs are vertebral bone marrow changes that are visible on MRI of the spine, and that represent regions of increased bone turnover and pro-inflammatory mediators. MCs are classified into types 1, 2, or 3, based on radiographic and histological features. MCs are clinically relevant because they are associated with low back pain, based on published studies. Findings from studies in clinical and non-clinical populations have demonstrated that the presence of MCs, especially type 1 MCs, is correlated with low back pain, predicts persistent symptoms, and sick leaves, and is associated with poor outcomes. These studies therefore suggest that MCs are a potential target for pharmaceutical intervention.

        There is currently no therapy specifically approved by the FDA or the EMA to treat CLBP associated with MCs. Currently available therapy for the broader CLBP population includes non-pharmacological approaches, such as exercise, and pharmacological treatments, such as NSAIDs and opioid medications. Current pharmacological treatments are generally short-acting and may address the symptoms of CLBP, but are not thought to have an effect on the underlying cause of the condition.

        Results of epidemiological studies suggest that there are approximately 121 million adults in the United States with low back pain in a given year. Approximately 9 million of these sufferers are estimated to have CLBP, of whom we estimate approximately 1.6 million have type 1 MCs.

Rationale for the Use of AXS-02 in CLBP Associated with MCs

        The rationale for utilizing AXS-02 for the treatment of CLBP associated with MCs is based on the observations that (1) MCs are associated with low back pain, (2) MCs represent regions of increased bone turnover based on three-phase bone scans and increased pro-inflammatory cytokines and vascular density based on analysis of lesions resected from human subjects, and (3) zoledronic acid potently inhibits bone turnover, may reduce pro-inflammatory cytokine production, is anti-angiogenic, and localizes preferentially to regions of increased turnover. The pharmacological actions of zoledronic acid therefore suggest the potential for AXS-02 to affect MCs, thereby reducing pain in patients with CLBP associated with MCs.

Clinical Development of AXS-02

        We are developing AXS-02 and intend to seek FDA approval for the product candidate utilizing the 505(b)(2) regulatory pathway. Section 505(b)(2) of the FDCA permits an applicant to file an NDA that relies, in part, on data not developed by or for the applicant and to which the applicant has not received a right of reference, such as the FDA's findings of safety and efficacy in the approval of a similar drug, or reference listed drug, or published literature, in support of its application. We currently plan to rely on the FDA's prior finding of safety and efficacy for IV-administered zoledronic acid as well as published literature to support our marketing application.

        We held a Type C meeting with the FDA in June 2014 where we presented our clinical development plan for AXS-02 in the treatment of pain associated with CRPS, the pain of knee OA

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associated with BMLs, and CLBP associated with MCs. Based on feedback from this meeting and other ongoing communications with the FDA, we plan to conduct two Phase 3 trials with AXS-02 in the treatment of pain associated with recently diagnosed CRPS, as well as a toxicology study and a food-effect study, to support an NDA filing for this indication. We requested scientific advice and protocol assistance from the EMA for the development of AXS-02 for the treatment of pain associated with CRPS. We received final advice from the EMA in March 2015. Based on this advice, we believe that only one successful Phase 3 trial in CRPS will be required to support a Marketing Authorization Application, or MAA, for AXS-02 in this indication.

        In May 2013, we received Orphan Drug Designation from the FDA for AXS-02 for the treatment of CRPS. This designation may entitle AXS-02 to a period of seven years of marketing exclusivity for the treatment of CRPS in the United States upon FDA approval. We submitted an Investigational New Drug Application, or IND, sponsored by us, in October 2013 for AXS-02 for the treatment of pain associated with CRPS.

        In October 2013, we received Orphan Medicinal Product Designation from the EMA for AXS-02 for the treatment of CRPS. Orphan Medicinal Product Designation provides ten years of potential market exclusivity in the European Union if the designated product candidate is approved for the indication for which it is designated and the orphan designation is maintained. Additionally, if a Pediatric Investigation Plan is completed, an additional two years of exclusivity in the European Union could be granted for a product with Orphan Medicinal Product Designation.

        In August 2014, we received Fast Track designation from the FDA for AXS-02 for the treatment of pain associated with CRPS. The FDA's Fast Track designation program is designed to aid in the development and expedite the review of drugs that are intended to treat serious or life-threatening conditions. In order to receive Fast Track designation, a product candidate must also demonstrate the potential to address an unmet medical need. Fast Track designation provides greater access to, and more frequent communication with, the FDA throughout the entire drug development and review process, with the goal of getting important new drugs to patients more rapidly. It also provides the opportunity to submit sections of an NDA on a rolling basis, where the FDA may review portions of the NDA as they are received instead of waiting for the entire NDA submission. In addition, Fast Track designated product candidates may be eligible for priority review at the time of NDA submission.

        We completed oral toxicology studies in the rat and dog models to support the dosing of AXS-02 in our completed Phase 1 trial and in our ongoing and planned Phase 3 trials. Dose-limiting adverse effects were primarily gastrointestinal related. We have completed a Phase 1 trial of AXS-02 to characterize the pharmacokinetics of zoledronic acid and its effects on markers of bone resorption after oral administration of AXS-02. In this trial, oral administration of AXS-02 tablets resulted in rapid absorption of zoledronic acid and marked suppression of bone resorption markers.

        The potential effect of zoledronic acid on the pain of knee OA associated with BMLs has been demonstrated in a Phase 2, investigator-initiated, randomized, double-blind, placebo-controlled trial. In this trial, IV administration of zoledronic acid resulted in a statistically significant reduction in pain and BML size at 6 months. The potential effect of zoledronic acid in CLBP associated with MCs has been demonstrated in a Phase 2, investigator-initiated, randomized, double-blind, placebo-controlled trial. In this trial, IV administration of zoledronic acid resulted in a statistically significant reduction in pain at 1 month and NSAID use at 12 months. We have obtained exclusive rights to the data generated from this trial in CLBP.

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        We are currently conducting a randomized, double-blind, placebo-controlled Phase 3 trial of AXS-02 in patients with CRPS. We plan to initiate a Phase 3 trial in patients with knee OA associated with BMLs in or before the first quarter of 2016, and a Phase 3 trial in patients with CLBP associated with MCs in the first half of 2016. We believe our planned Phase 3 dosing of AXS-02 will provide cumulative systemic exposure of zoledronic acid that is similar to that achieved with the 5 mg IV dose used in the Phase 2 trials in knee OA and CLBP, based on the results of our completed Phase 1 trial.

Completed Phase 1 Trial of AXS-02

        We conducted a Phase 1 trial to assess the fasting pharmacokinetics, pharmacodynamics, safety, and tolerability of orally administered AXS-02 tablets in healthy adult male and postmenopausal female volunteers under a Health Canada Clinical Trial Application. The trial was a randomized, open-label, partial crossover study in a total of 36 subjects. Each subject received two of the following four treatments: three varying oral doses of AXS-02 or a 1 mg IV dose of zoledronic acid. Each treatment was separated by a wash-out period of at least 14 days. Blood samples were collected prior to dosing and after dosing to measure zoledronic acid plasma concentrations and the effect of AXS-02 on biomarkers of bone resorption, including serum CTx.

        Zoledronic acid was rapidly absorbed after oral administration of AXS-02 tablets with median time to reach the maximum plasma concentration, or T_max, of 30 to 45 minutes. The absolute oral bioavailability of zoledronic acid after administration of AXS-02 tablets found in this trial was greater than that reported for oral bisphosphonate agents currently marketed in the United States, based on FDA package inserts. Zoledronic acid plasma concentrations after oral administration of AXS-02, measured using area under the plasma concentration curve, or AUC, and maximum plasma concentration, or C_max, were found to be dose proportional in the range tested using the power model.

        Oral administration of AXS-02 resulted in marked reductions of biomarkers of bone resorption. For example, as shown in the figure below, levels of serum CTx were reduced by approximately 80 to 90% seven days after dosing. This effect was generally maintained 14 to 15 days after dosing.

Serum CTx change from baseline after oral administration of varying doses of AXS-02,
and IV administration of 1 mg zoledronic acid

        There were no reported serious adverse events in the trial. The majority of treatment-emergent adverse events experienced were graded as mild or moderate in severity, were transient in nature, and were completely resolved by the end of the study. The most commonly reported adverse events were headache, fever, musculoskeletal pain, diarrhea, abdominal pain, nausea, myalgia, and chills. Adverse

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events were reported more frequently with increasing oral doses, and more frequently in the oral dose groups than in the IV dose group.

Phase 2 of Zoledronic Acid in the Pain of Knee OA Associated with BMLs

        IV-administered zoledronic acid, the active molecule in AXS-02, was tested in an investigator-initiated, single-center, randomized, double-blind, placebo-controlled trial in patients with knee OA associated with BMLs. In this trial, zoledronic acid treatment reduced pain and BML size, as further described below, demonstrating an effect on symptom and structure. The design and results of this trial have been reported in a peer-reviewed journal.

        In the trial, 59 patients, aged 50 to 80 years, with clinical knee OA and knee BMLs on MRI were randomized in a 1:1 ratio to receive either a single 5-mg IV infusion of zoledronic acid or placebo. BMLs were determined using proton density-weighted fat saturation magnetic resonance images at baseline, 6, and 12 months. Pain intensity was measured at baseline, 3, 6, and 12 months using a 100-mm visual analogue scale, or VAS, which is a standard clinical measurement for pain severity. Total BML area was measured in square millimeters at baseline, 6, and 12 months. The primary outcomes were the change from baseline to 6 months in pain intensity as measured by the VAS, and maximal area of BML measured at 6 months. Participants were allowed to remain on their background pain medications but the dose was kept constant through the trial period where possible. One subject randomized to placebo received zoledronic acid. Therefore, data for this patient was included in the zoledronic acid arm in the analyses and results discussed below. This analysis is referred to as a per protocol analysis.

        At baseline, the mean VAS score was 54 mm. As shown in the figure below, there was a statistically significant reduction in pain intensity, measured using the VAS, from baseline to 6 months in the zoledronic acid-treated group as compared to placebo, using the per protocol analysis. Changes in pain intensity between baseline and the other time points were numerically greater in the zoledronic acid arm than in the placebo arm but were not statistically significant.

Pain intensity over time in knee OA patients with BMLs treated with zoledronic acid or placebo

Source: Derived from Laslett et al. Ann Rheum Dis. 2012;71:1322-1328.

        As shown in the figure below, there was a statistically significant reduction in BML area at 6 months in the zoledronic acid-treated group as compared to placebo. At the 12 month assessment,

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the changes in BML size were lower in magnitude in the zoledronic acid arm as compared to the placebo arm and were not statistically significant.

BML area over time in subjects treated with zoledronic acid or placebo

Source: Derived from Laslett et al. Ann Rheum Dis. 2012;71:1322-1328.

        The most commonly reported adverse events were acute phase reactions, which are primarily cold or flu-like symptoms and headaches. Adverse events occurred more frequently in the zoledronic acid-treated group. Serious adverse events were primarily non-elective hospital admissions, none of which were considered causally related to study drug.

Phase 2 of Zoledronic Acid in CLBP Associated with MCs

        IV-administered zoledronic acid was tested in an investigator-initiated, single-center, randomized, double-blind, placebo-controlled trial in patients with CLBP associated with MCs. In this trial, zoledronic acid treatment resulted in a statistically significant reduction in pain at 1 month and NSAID use at 12 months. We have exclusive rights to reference these trial data.

        In the trial, 40 patients, with a mean age of approximately 50 years, with low back pain lasting at least 3 months and MCs on MRI, were randomized in a 1:1 ratio to receive either a single 5-mg IV infusion of zoledronic acid or placebo. MCs were determined on MRI performed within 6 months prior to enrollment. Other inclusion criteria included pain intensity of at least 6 cm on a 10-cm VAS or an Oswestry Disability Index, or ODI, of at least 30%. Low back pain intensity was measured at screening and 1 and 12 months after infusion using a 10-cm VAS. The primary outcome was the change in low back pain intensity as measured by the VAS. Pain medication use was inquired about during study visits.

        Study participants had a mean low back pain duration of 293 days at study entry, and initial low back pain intensity of 6.7 on the VAS. All patients displayed either type 1, type 2, or mixed type 1 and type 2 MCs on MRI. As shown in the figure below, there was a statistically significant reduction in pain intensity, measured using the VAS, at 1 month in the zoledronic acid-treated group as compared to placebo. Changes in pain intensity at 12 months were numerically greater in the zoledronic acid arm than in the placebo arm but were not statistically significant.

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Change in pain intensity at 1 month in CLBP patients treated with zoledronic acid or placebo

        As shown in the figure below, at 1 year only 20% of patients in the zoledronic acid treatment group reported using NSAIDs compared to 60% of patients in the placebo group. At baseline, there were no differences in self-reported use of NSAIDs between the treatment groups.

NSAID use at 1 year in CLBP patients treated with zoledronic acid or placebo

        The most commonly reported adverse events were acute phase reactions, which occurred more frequently in the zoledronic acid-treated group. The majority of the acute phase reactions were rated mild to moderate in severity and typically resolved within three days of onset. Sinusitis requiring temporary hospitalization following zoledronic acid infusion was reported in one patient and was therefore classified as a serious adverse event.

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Ongoing and Planned Phase 3 Trials of AXS-02 in CRPS

Ongoing CREATE-1 Study

        In July 2015, we initiated the CREATE-1 study, a Phase 3, randomized, double-blind, placebo-controlled trial to assess the efficacy and safety of AXS-02 in the treatment of pain associated with CRPS. Eligible patients must be at least 18 years of age, with recently diagnosed CRPS type 1 according to the International Association for the Study of Pain, or IASP, diagnostic criteria, and an average weekly baseline pain intensity in the affected limb of at least 5 on an 11-point (0-10) numeric rating scale, or NRS. In addition, the CRPS must have been precipitated by traumatic injury to the affected limb, for example, fracture, crushing injury, or orthopedic surgery. We expect to complete this trial by the end of 2017.

        After a baseline period, patients meeting the entry criteria will be randomly assigned in a 1:1 ratio to orally receive either (1) AXS-02 tablets once per week for 6 weeks, or (2) matching placebo tablets once per week for 6 weeks. Patients will receive drug or placebo under fasting conditions, which is typical for oral bisphosphonates. Randomized patients will remain blinded for an additional 6 weeks, totaling 12 weeks for the double-blind phase. The primary endpoint will be the change in pain intensity from baseline to week 12, measured using the NRS. Patients will be followed for an additional 12 weeks after the double-blind period. We anticipate that the study will enroll a total of approximately 190 patients. An interim analysis for efficacy is planned on the first approximately 50% of patients who are enrolled and who complete the double-blind phase, and is anticipated around the end of 2016. The basic trial design is summarized in the diagram below.

Additional Planned Phase 3 Trial in CRPS

        We plan to conduct a second Phase 3 trial in patients with recently diagnosed CRPS. The design and entry criteria for this trial will be similar to those of the CREATE-1 trial with the exception that it will incorporate three treatment arms instead of two. After a baseline period, patients meeting the entry criteria will be randomized in a 1:1:1 ratio to receive either (1) AXS-02 tablets once per week for 6 weeks, (2) AXS-02 tablets once per week for 3 weeks and matching placebo tablets for the following 3 weeks or (3) matching placebo tablets once per week for 6 weeks. Randomized patients will remain blinded for an additional 6 weeks, totaling 12 weeks for the double-blind phase. The primary endpoint will be the change in pain intensity from baseline to week 12, measured using the NRS. We anticipate that the trial will enroll a total of approximately 285 patients.

Planned Phase 3 Trial in the Pain of Knee OA Associated with BMLs

        We intend to initiate a Phase 3, randomized, double-blind, placebo-controlled trial to assess the efficacy and safety of AXS-02 in the treatment of the pain of knee OA associated with BMLs. This trial is anticipated to enroll patients with clinically diagnosed knee OA and at least one confirmed BML in the affected knee on MRI. After a baseline period, patients meeting the entry criteria will be randomized in a 1:1 ratio to receive either (1) AXS-02 tablets once per week for 6 weeks, or (2) matching placebo tablets once per week, under fasting conditions for 6 weeks. Randomized patients will remain blinded for an additional 18 weeks, totaling 24 weeks for the double-blind phase. The

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primary endpoint is anticipated to be the change in pain intensity from baseline to week 24, measured using the NRS. We anticipate that the trial will enroll a total of approximately 300 patients. We plan to initiate this trial in or before the first quarter of 2016.

Planned Phase 3 Trial in CLBP Associated with MCs

        We intend to initiate a Phase 3, randomized, double-blind, placebo-controlled trial to assess the efficacy and safety of AXS-02 in the treatment of CLBP associated with MCs. This trial is anticipated to enroll patients with low back pain lasting at least 3 months and confirmed type 1 or mixed type 1 and type 2 MCs on MRI. After a baseline period, patients meeting the entry criteria will be randomized in a 1:1 ratio to receive either (1) AXS-02 tablets once per week for 6 weeks or (2) matching placebo tablets once per week, under fasting conditions for 6 weeks. Randomized patients will remain blinded for an additional 6 weeks, totaling 12 weeks for the double-blind phase. The primary endpoint is anticipated to be the change in pain intensity from baseline to week 12, measured using the NRS. We anticipate that the trial will enroll a total of approximately 300 patients. We plan to initiate this trial in the first half of 2016.

AXS-05

Overview

        AXS-05 is an innovative fixed-dose combination of dextromethorphan and bupropion under development for the treatment of CNS disorders. DM is active at multiple CNS receptors but is rapidly metabolized into dextrorphan, or DXO, when dosed alone. Our combination uses bupropion as a novel drug delivery method to inhibit DM metabolism and increase its bioavailability. Bupropion itself is also active at distinct CNS receptors. The activity of the two components may provide an additive or synergistic effect.

        AXS-05 is potentially applicable to the treatment of a variety of CNS disorders, based on the mechanisms of action of its two components. We are developing AXS-05 initially as a therapeutic for treatment resistant depression and agitation in patients with Alzheimer's disease.

Scientific Rationale

        DM and bupropion each target different CNS receptor systems that are potentially relevant to the treatment of CNS disorders. Combining the distinct and independent mechanisms of action of these

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two compounds may be additive or synergistic in the treatment of depression and other CNS disorders. However, as shown in the figure above, DM is quickly eliminated from the body following administration due to extensive first pass metabolism, which results in low blood levels even at high doses. Attainment of potential therapeutic plasma levels of DM is therefore difficult when DM is dosed as a single agent. We have demonstrated in two Phase 1 trials that co-administration of bupropion and DM leads to substantially increased DM plasma levels. This positive pharmacokinetic interaction between bupropion and DM therefore may enable DM's clinical utility by increasing DM's plasma levels into a potentially therapeutic range. We believe this dual pharmacodynamic and pharmacokinetic synergy results in a unique pharmacological profile that could potentially be efficacious in CNS disorders.

        Bupropion is a well-characterized antidepressant that is chemically unrelated to tricyclic, tetracyclic, selective serotonin reuptake inhibitor, or other known antidepressant agents. It is an inhibitor of the neuronal uptake of norepinephrine and dopamine, and does not inhibit monoamine oxidase or the reuptake of serotonin. It is the only antidepressant currently available that is capable of selectively inhibiting both dopamine and norepinephrine reuptake. Bupropion was approved in the United States in 1985 and is marketed under the trade name Wellbutrin for the treatment of major depressive disorder, or MDD, and under the trade name Zyban as an aid to smoking cessation.

        DM is a noncompetitive N-methyl-D-aspartate, or NMDA, receptor antagonist, sigma-1 receptor agonist and inhibitor of the serotonin transporter, or SERT, and norepinephrine transporter, or NET. Each of these mechanisms of action has been shown to be associated with antidepressant response. DM is a well-known agent that is used as an ingredient in over-the-counter cough and cold preparations. DM, in combination with quinidine, was approved by the FDA in 2010 for the treatment of pseudobulbar affect, also known as emotional lability. Like bupropion in our product candidate, quinidine is used to inhibit the metabolism of DM and increase its plasma concentrations. Unlike bupropion, however, the quinidine in the preparation does not have CNS activity.

        The independent mechanisms of action of bupropion and DM that we believe contribute to the unique pharmacological profile of AXS-05 are summarized in the figure below.

Treatment Resistant Depression (TRD)

        We are developing AXS-05 for the treatment of TRD. Currently only one product, Symbyax, a combination of olanzapine and fluoxetine, which is marketed by Eli Lilly and Company, is approved in the United States for the treatment of TRD.

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Indication Overview

        Patients diagnosed with MDD are defined as having TRD if they have failed two or more antidepressant therapies. MDD is a serious condition characterized by depressed mood or a loss of interest or pleasure in daily activities consistently for at least a two-week period, and which impairs social, occupational, educational, or other important functioning. MDD is highly prevalent and difficult to treat. According to the National Institute of Health, or NIH, an estimated 6.7% of U.S. adults experience MDD each year, while 3.3% of individuals 13 to 18 years of age experience a seriously debilitating depressive disorder. Results of the Sequenced Treatment Alternatives to Relieve Depression, or STAR*D trial, funded by the National Institute of Mental Health, indicate that nearly two-thirds of diagnosed and treated patients do not experience adequate treatment response with first-line therapy, and that the majority of these initial failures also fail second-line treatment. Based on these observations, we estimate that there are approximately 3 million patients with TRD in the United States.

Rationale for the Use of AXS-05 in TRD

        The rationale for the use of AXS-05 in TRD is based on the mechanisms of action of DM, preclinical evidence of antidepressant effects of DM, preliminary clinical evidence of antidepressant effects of DM when co-administered with an inhibitor of its metabolism, and the established clinical efficacy of bupropion in MDD.

        Mechanistic rationale.    DM's mechanisms of action encompass those of several currently marketed antidepressant drugs such as duloxetine (Cymbalta), fluoxetine (Prozac), and fluvoxamine (Luvox). Bupropion inhibits the reuptake of dopamine and is a nicotinic acetylocholine receptor antagonist. The distinct mechanisms of action of DM and bupropion may therefore be complementary. Additionally we believe that, if successfully developed, the NMDA receptor antagonist properties of DM in AXS-05 may potentially result in a faster onset of action than currently available antidepressant treatments.

        Preclinical rationale.    The effects of DM have been reported in two preclinical models of antidepressant effect. In the forced swim test model in mice, DM administered intraperitoneally resulted in antidepressant-like effects in a dose-dependent manner. The forced swim test is considered to be the most well-validated animal model for predicting antidepressant effect. Using the tail suspension test in mice, another widely used behavioral test for assessing antidepressant potential, DM was also shown to display antidepressant-like effects similar to those seen with imipramine, a conventional antidepressant, and ketamine, a compound that has demonstrated fast-acting antidepressant effects. In both models, inhibition of DM metabolism using quinidine was shown to potentiate the antidepressant-like effects.

        Clinical Rationale.    Administration of DM with an inhibitor of its metabolism has been shown to reduce depressive symptoms, measured using the Beck Depression Inventory Second Edition, or BDI-II, in a third-party study. In a 326-patient, randomized, double-blind, placebo-controlled trial in patients with pseudobulbar affect, co-administration of DM and the metabolic inhibitor quinidine resulted in a statistically significant reduction in depressive symptoms as compared to placebo at the 30 mg DM / 10 mg quinidine dose at 12 weeks, as shown in the figure below. Patients were excluded from the study if their BDI-II score was greater than 19, with a score in the range of 0 to 13 corresponding to minimal depression and 14 to 19 corresponding to mild depression. Assessment of depressive symptoms was a pre-specified secondary endpoint in this trial.

        According to the FDA package insert for the combination of DM and quinidine (Nuedexta), DM is the pharmacologically active ingredient of the DM / quinidine combination that acts on the CNS, with quinidine serving to increase DM plasma levels. The plasma concentrations of DM, measured using AUC_0-12 and C_max, achieved with AXS-05 administration in our Phase 1 trials are in the range of those associated with a 30 mg DM / 10 mg quinidine dose, based on data published by the FDA.

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Depressive symptom change with DM and metabolic inhibitor quinidine (Q) in patients with pseudobulbar affect at 12 weeks

Source: Pioro EP, et al. Ann Neurol 2010;68:693-702.

Agitation in Patients with Alzheimer's Disease (AD)

        We intend to develop AXS-05 for the treatment of agitation in patients with AD. There is currently no FDA-approved pharmacological treatment for the indication of agitation in patients with AD.

Indication Overview

        AD is a progressive neurodegenerative disorder that manifests initially as forgetfulness advancing to severe cognitive impairment and memory loss. It is a common form of dementia and afflicts an estimated 5 million individuals in the United States, a number that is anticipated to increase to approximately 14 million by 2050. In addition to cognitive decline, individuals diagnosed with AD typically experience behavioral and psychological symptoms including agitation and aggression. These symptoms are seen in a high percentage of AD sufferers with agitation being reported in as many as 40% of patients. Agitation is characterized by emotional distress, aggressive behaviors, disruptive irritability, and disinhibition. Agitation in patients with AD has been associated with increased caregiver burden, decreased functioning, earlier nursing home placement, and death.

        Because there are no FDA-approved pharmacological treatments for the indication of agitation in patients with AD, patients are currently treated off-label with various agents including antipsychotics, which have been considered the mainstay of treatment. These treatments however are limited by safety concerns. Typical antipsychotics prescribed for agitation, aggression, or insomnia are associated with functional decline in patients with AD, while studies indicate that atypical antipsychotics may be associated with increased rates of cerebrovascular events in patients with dementia.

Rationale for the Development of AXS-05 in Agitation in Patients with AD

        The rationale for the use of AXS-05 for the treatment of agitation in patients with AD is based on the mechanisms of action of DM, and preliminary clinical evidence of the effect of DM when co-administered with an inhibitor of its metabolism in agitation in patients with AD.

        Mechanistic rationale.    Mechanisms of action of DM include NMDA receptor antagonism and sigma-1 receptor agonism. Altered glutamate transmission via NMDA receptors has been suggested to play a role in behavioral changes in dementia, and clinical evidence suggests that NMDA antagonism

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may reduce agitation and aggression in AD patients. The pharmacologic action of agents used in the treatment of dementia, such as donepezil, and behavioral disorders, such as fluvoxamine, include sigma-1 receptor agonism.

        Clinical Rationale.    Administration of DM with an inhibitor of its metabolism has been shown to result in a statistically significant reduction in agitation in patients with AD. The effects of DM co-administered with the metabolic inhibitor quinidine was studied in a third-party, randomized, double-blind, placebo-controlled, two-stage trial in 220 patients with probable AD and clinically meaningful agitation. In stage 1 of the study, patients were randomized to receive either placebo or DM with quinidine (20 mg DM / 10 mg quinidine once per day, titrated to 30 mg DM / 10 mg quinidine twice per day). In stage 2, patients initially on placebo were stratified according to response, then re-randomized to placebo or active treatment (titrated as in stage 1). Each stage lasted five weeks. The primary endpoint was the change in the agitation/aggression domain of the Neuropsychiatric Inventory, or NPI, assessed by combining results from the two stages.

        The primary endpoint showed a statistically significant improvement with DM and quinidine as compared to placebo. A statistically significantly greater reduction in the agitation/aggression domain of the NPI for active treatment as compared to placebo was seen in both stage 1 as well as in stage 2 of the study. During stage 1, a reduction of 3.3 in the agitation/aggression domain of the NPI was seen for active treatment as compared to a reduction of 1.7 for placebo, with a P value that is less than 0.001, as shown in the figure below. During stage 2, a reduction of 2.0 was observed for active treatment as compared to a reduction of 0.8 for placebo, with a P value that is equal to 0.02. Average baseline values for the agitation/aggression domain of the NPI were 7.1 for the active treatment group and 7.0 for the placebo group. Statistically significant improvements for the active treatment arm compared to placebo were also reported for the majority of secondary endpoints including the NPI total score, NPI-Caregiver Distress Score, Caregiver Strain Index, and Cornell Scale for Depression in Dementia. Moreover, treatment with DM and the metabolic inhibitor was not associated with cognitive decline as measured by the Mini Mental State Examination.

        In the trial, patients were titrated to a 30 mg DM / 10 mg quinidine dose. According to the FDA package insert for Nuedexta, DM is the pharmacologically active ingredient of the DM / quinidine combination that acts on the CNS, with quinidine serving to increase DM plasma levels. The plasma concentrations of DM, measured using AUC_0-12 and C_max, achieved with AXS-05 administration in our Phase 1 trials are in the range of those associated with a 30 mg DM / 10 mg quinidine dose, based on data published by the FDA.

Change in agitation/aggression scores in AD with DM and
metabolic inhibitor quinidine (Q) during stage 1

Source: Am J Geriatr Psychiatry 2015; 23:3, Supplement 1, S164-S165.

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Clinical Development of AXS-05

        We are developing AXS-05 and intend to seek FDA approval for the product utilizing the 505(b)(2) regulatory pathway. We have completed two Phase 1 pharmacokinetic clinical trials of AXS-05 under clinical trial applications, or CTAs, with Health Canada. In both studies, administration of bupropion in combination with DM resulted in a substantial increase in DM plasma concentrations measured using C_max and AUC at all doses tested.

        We held a pre-IND meeting with the FDA in February 2015 where we discussed our clinical development plan for AXS-05 in TRD. Based on that meeting, we plan to submit an investigational new drug application, or IND, to the FDA and conduct two Phase 3 trials of AXS-05 in TRD to support an NDA filing for this indication.

        We expect to be ready to initiate a Phase 3, randomized, double-blind, active-controlled trial of AXS-05 in the treatment of TRD in or before the first quarter of 2016. We plan to request a meeting with the FDA in 2016 to discuss our plans to conduct a controlled trial of AXS-05 in agitation in patients with AD.

Completed Phase 1 Trials of AXS-05

        We have completed two Phase 1 pharmacokinetic clinical trials of AXS-05. The objectives of these trials were to assess the pharmacokinetics of DM when co-administered with bupropion, and to assess the safety and tolerability of the combination. In these Phase 1 trials, the components of AXS-05, DM and bupropion, were co-administered as separate tablets. In both studies, administration of bupropion in combination with DM resulted in substantial increases in DM plasma concentrations measured using C_max and AUC at all doses tested.

        The first Phase 1 trial was a randomized, multiple-dose, open-label study to determine the pharmacokinetics of DM when various doses of DM are administered concomitantly with bupropion under fasting conditions, as well as the safety of the combination. Subjects were randomized to receive twice-daily administrations of 150 mg of bupropion in combination with DM at various doses up to 60 mg, or 60 mg of DM alone, for 8 consecutive days. Bupropion was titrated with subjects being dosed once daily for the first 3 days, then twice daily thereafter. A total of 32 healthy, adult volunteers were included in this study in four treatment groups. Full pharmacokinetic assessments were made on Day 1 and Day 8. As shown in the figure below, for the dose of 60 mg of DM / 150 mg of bupropion, AUC_0-12 and C_max values on Day 8 for DM when dosed in combination with bupropion were approximately 60 times and 40 times, respectively, the values for DM when dosed alone. For all doses tested, administration of DM in combination with bupropion resulted in substantial increases in AUC_0-12 and C_max values of DM on Day 8 as compared to Day 1 of dosing. DM exposure measured using AUC and C_max increased in a dose dependent manner with increasing doses of DM. Administration of DM did not appear to affect the pharmacokinetics of bupropion.

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DM plasma concentrations resulting from dosing of DM alone or
DM with bupropion (AXS-05) on day 8

        There were no reported serious adverse events in the trial. The majority of treatment-emergent adverse events experienced were graded as mild or moderate in severity, and had resolved by the end of the study. The most commonly reported adverse events were dizziness, nausea, headache, insomnia, dry mouth, constipation, hypoesthesia, palpitation, disturbance in attention, tremor, and hyperhidrosis. Adverse events were reported more frequently in the AXS-05 arm as compared to the DM-only arm. The majority of these adverse events were expected with the administration of bupropion, having been already reported in the FDA package inserts for products containing bupropion.

        The second Phase 1 trial was a randomized, multiple-dose, open-label study to determine the pharmacokinetics of DM when various doses of DM are administered concomitantly with various doses of bupropion and to assess safety during co-administration of bupropion and DM. A total of 40 healthy, adult volunteers were included in this study in five treatment groups. Subjects were randomized to receive twice-daily administration of either 150 mg of bupropion alone, or combinations of varying doses of bupropion and DM for 8 consecutive days. Bupropion was titrated with subjects being dosed once daily for the first 3 days, then twice daily thereafter. Full pharmacokinetic assessments were made on Day 1 and Day 8. Similar to the results in our first study, administration of DM in combination with bupropion resulted in substantial increases in AUC_0-12 and C_max values of DM on Day 8 as compared to Day 1 of dosing for all combinations tested. DM exposure measured using AUC and C_max increased in a dose-dependent manner as doses of either DM or bupropion were increased. Administration of DM did not appear to affect the pharmacokinetics of bupropion.

        There were no reported serious adverse events in the trial. The majority of treatment-emergent adverse events experienced were graded as mild in severity, and had resolved by the end of the study. The most commonly reported adverse events were headache, nausea, dizziness, fatigue, increased heart rate, palpitations, constipation, diarrhea, increased blood pressure, and tremor. No particular trend was observed when comparing the rates or types of adverse events in the combination groups as compared to the group receiving bupropion alone.

Planned Phase 3 Trial of AXS-05 in TRD

        We intend to initiate a Phase 3, randomized, double-blind, active-controlled trial to assess the efficacy and safety of AXS-05 in the treatment of TRD. Patients with MDD who have previously failed one antidepressant treatment will be treated in an open-label fashion with bupropion during a 6-week lead-in period. Patients who fail to respond to bupropion during this lead-in period will be considered to have TRD and will be randomly assigned in a 1:1 ratio to receive bupropion or AXS-05 in a double-blind fashion for 4 weeks. The primary endpoint is anticipated to be the change in the Montgomery-Asberg Depression Rating Scale after 4 weeks of treatment. We anticipate that the study will enroll a

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total of approximately 300 randomized patients. We will be submitting an IND prior to the conduct of this trial and we expect to be ready to initiate this trial in or before the first quarter of 2016.

Planned Phase 3 Trial of AXS-05 in Agitation in Patients with AD

        We plan to request a meeting with the FDA in 2016 to discuss our development plans for AXS-05 in agitation in patients with AD. Pending the results of this meeting, we intend to conduct a controlled trial to assess the efficacy and safety of AXS-05 in AD patients with agitation.

Preclinical Programs

        We have one active program, AXS-06, in preclinical development. We are currently conducting formulation work for this program. Following formulation, we plan to conduct a preclinical study to assess the pharmacokinetics of AXS-06 prior to potentially advancing it into clinical trials.

Commercial Agreements

        We have customary clinical supply agreements and a customary agreement with a clinical research organization to help manage our clinical trials. Each of our commercial agreements are non-exclusive, and we have no material contractual obligations under such agreements, except to the extent we order supply or request services to be performed.

Material License Agreements

        In 2012, we entered into three exclusive license agreements with Antecip Bioventures II LLC, or Antecip, an entity owned by our Chief Executive Officer and Chairman of the Board, Herriot Tabuteau, M.D., in which we were granted exclusive licenses to develop, manufacture, and commercialize Antecip's patents and applications related to the development of AXS-02 and AXS-05, as well as AXS-04, a product candidate that is currently in early stage development, anywhere in the world for veterinary and human therapeutic and diagnostic use. Pursuant to the agreements, we are required to use commercially reasonable efforts to develop, obtain regulatory approval for, and commercialize AXS-02, AXS-05, and AXS-04. Under the terms of the agreements, we are required to pay to Antecip a royalty equal to 4.5% for AXS-02, 3.0% for AXS-05, and 1.5% for AXS-04, of net sales of products containing the licensed technology by us, our affiliates, or permitted sublicensees. These royalty payments are subject to reduction by an amount up to 50.0% of any required payments to third parties. Unless earlier terminated by a party for cause or by us for convenience, the agreements remain in effect on a product-by-product and country-by-country basis until the later to occur of (1) the applicable product is no longer covered by a valid claim in that country or (2) 10 years from the first commercial sale of the applicable product in that country. Upon expiration of the agreements with respect to a product in a country, our license grant for that product in that country will become a fully paid-up, royalty-free, perpetual non-exclusive license. If Antecip terminates any of the agreements for cause, or if we exercise our right to terminate any of the agreements for convenience, the rights granted to us under such terminated agreement will revert to Antecip. To date, we have not been required to make any payments to Antecip under any of the license agreements.

Intellectual Property

        We seek to protect our product candidates and our technology through a combination of patents, trade secrets, proprietary know-how, FDA and EMA exclusivity, and contractual restrictions on disclosure. Our policy is to pursue, maintain, and defend patent rights whether developed internally or licensed from third parties and to protect the proprietary position of our product candidates by, among other methods, filing U.S. and foreign patent applications related to our proprietary technology, inventions, and improvements that are important to the development of our business. U.S. patents generally have a term of 20 years from the earliest effective date of the application.

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        Our intellectual property portfolio contains 13 issued patents and 3 allowed and more than 50 pending applications in the United States and worldwide. Twelve issued patents and more than 35 pending patent applications covering our AXS-02 product candidate have claims covering method of delivery, pharmacokinetics, composition of matter, and methods of use with protection extending through 2034 for both our issued patents and pending applications. In addition to patent protections, our AXS-02 program, if approved, may also be afforded potential exclusivity by the FDA's and EMA's orphan drug designation programs for CRPS, which provide 7 years and 10 to 12 years of exclusivity, respectively. One issued patent and 3 allowed and several pending patent applications covering our AXS-05 product candidate have claims covering pharmaceutical composition, drug delivery, and pharmacokinetics with protection extending through 2032 to 2034 for our issued and allowed patents, as well as our pending applications. We have pending PCT applications, as well as pending applications in Australia, Canada, China, Europe, Hong Kong, Japan, South Korea, and New Zealand. We have other patent applications with claims covering the other programs in our pipeline, including those that are not relevant to our current programs in development. We have licensed the patents and pending applications which cover AXS-02, AXS-04, and AXS-05 from Antecip. All of the other components of our intellectual property portfolio are owned by Axsome.

        Many pharmaceutical companies, biotechnology companies, and academic institutions are competing with us in the field of pain and CNS disorders and filing patent applications potentially relevant to our business. In order to contend with the inevitable possibility of third-party intellectual property conflicts, from time to time, we review and assess the third-party intellectual property landscape for competitive and other developments that may inform or impact our intellectual property development and commercialization strategies. With respect to third-party intellectual property, it is impossible to establish with certainty that our product candidates or discovery platform will be free of claims by third-party intellectual property holders or whether we will require licenses from such third parties. Even with modern databases and on-line search engines, literature searches are imperfect and may fail to identify relevant patents and published applications. Even when a third-party patent is identified, we may conclude upon a thorough analysis, that we do not infringe the patent or that the patent is invalid. If the third-party patent owner disagrees with our conclusion and we continue with the business activity in question, we might have patent litigation forced upon us. Alternatively, we might decide to initiate litigation in an attempt to have a court declare the third-party patent invalid or not infringed by our activity. In either scenario, patent litigation typically is costly and time consuming, and the outcome is uncertain. The outcome of patent litigation is subject to uncertainties that cannot be quantified in advance, for example, the credibility of expert witnesses who may disagree on technical interpretation of scientific data. Ultimately, in the case of an adverse outcome in litigation, we could be prevented from commercializing a product or using certain aspects of our discovery platform as a result of patent infringement claims asserted against us. This could have a material adverse effect on our business. In addition to patents, we rely upon unpatented trade secrets, know-how, and continuing technological innovation to develop and maintain a competitive position. We seek to protect our proprietary information, including our trade secrets and proprietary know-how, by requiring our employees to execute Proprietary Information, Inventions, Non-Solicitation, and Non-Competition Agreements upon the commencement of their employment. Consultants and other advisors are required to sign consulting agreements. These agreements generally provide that all confidential information developed or made known during the course of the relationship with us be kept confidential and not be disclosed to third parties except in specific circumstances. In the case of our employees, the agreements also typically provide that all inventions resulting from work performed for us, utilizing our property or relating to our business and conceived or completed during employment shall be our exclusive property to the extent permitted by law. Further, we require confidentiality agreements from entities that receive our confidential data or materials.

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Sales and Marketing

        We intend to build a commercial infrastructure in the United States in advance of anticipated drug approval of our product candidates. We believe that we can cost-effectively implement a targeted sales force required to commercialize our products, if approved, in the United States for the treatment of pain associated with CRPS, the pain of knee OA associated with BMLs, and CLBP associated with MCs. Support for this team will include sales management, internal sales support, distribution support, and an internal marketing group. Additional requisite capabilities will include focused management of key accounts such as managed care organizations, group purchasing organizations, and government accounts. We may seek co-promotion partners for our sales efforts to reach other United States physician groups, such as primary care physicians. We believe that there are significant market opportunities for our products outside of the United States. As a result, we plan to seek strategic partnerships with third parties, which may have greater reach and resources by virtue of their size and experience in the field, for the development and commercialization of our products outside the United States. We may elect in the future to utilize strategic partners, distributors, or contract sales forces to assist in the commercialization of our products. In order to implement this infrastructure, we will have to allocate management resources and make significant financial investments including some prior to product approval.

Scientific Advisors

        In March 2015, we formed a Depression Scientific Advisory Board, or SAB, composed of leading experts in the areas of depression, FDA regulations, and clinical trial design. These experts provide key scientific, clinical, and strategic guidance concerning our development programs in depression and other CNS disorders. The following members were appointed to our Depression SAB: Maurizio Fava, M.D., Director of the Clinical Research Program and Executive Vice Chair of the Department of Psychiatry at Massachusetts General Hospital, and Slater Family Professor of Psychiatry at Harvard Medical School; Thomas Laughren, M.D., retired Division Director of the FDA's Division of Psychiatry Products; and Dan Iosifescu, M.D., Director of the Mood and Anxiety Disorders Program and Associate Professor of Psychiatry and Neuroscience at the Icahn School of Medicine at Mount Sinai, and Consultant in Psychiatry at Massachusetts General Hospital. We also benefit from the guidance of our other scientific advisors in the areas of CRPS, knee OA, CLBP, and pain clinical trial design.

Competition

Overview

        Our industry is highly competitive and subject to rapid and significant technological change. The large size and expanding scope of the pain and CNS markets make them attractive therapeutic areas for biopharmaceutical businesses. Our potential competitors include pharmaceutical, biotechnology, and specialty pharmaceutical companies. While we believe that our employees and consultants, scientific knowledge, technology, and development experience provide us with competitive advantages, we face potential competition from many different sources, including major pharmaceutical, specialty pharmaceutical, and biotechnology companies, academic institutions and governmental agencies, and public and private research institutions. Several of these entities have robust drug pipelines, readily available capital, and established research and development organizations. Any product candidates that we successfully develop and commercialize will compete with existing therapies and new therapies that may become available in the future. Many of our competitors may have significantly greater financial resources and expertise in research and development, manufacturing, preclinical testing, conducting clinical trials, obtaining regulatory approvals, and marketing approved products than we do. Mergers and acquisitions in the pharmaceutical, biotechnology, and diagnostic industries may result in even more resources being concentrated among a smaller number of our competitors. These competitors also compete with us in recruiting and retaining qualified scientific and management personnel and establishing clinical trial sites and patient registration for clinical trials, as well as in acquiring

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technologies complementary to, or necessary for, our programs. Small or early stage companies may also prove to be significant competitors, particularly through collaborative arrangements with large and established companies. The key competitive factors affecting the success of all of our product candidates, if approved, are likely to be their efficacy, safety, convenience, price, the level of branded and generic competition, and the availability of reimbursement from government and other third-party payors.

AXS-02 Competition

        There are no drugs approved by the FDA or the EMA for the treatment of pain associated with CRPS, although various classes of pain medications, such as NSAIDs and opioids, are used off-label. We are aware of other companies working to develop therapeutics for the treatment of pain associated with CRPS, including Grunenthal GmbH and Thar Pharmaceuticals, Inc. Companies working to develop therapeutics for the treatment of pain associated with knee OA include Carbylan Therapeutics, Inc.; Flexion Therapeutics, Inc.; and Levolta Pharmaceuticals, Inc., which is developing an IV zoledronic acid product for the treatment of knee OA. We are aware of two companies attempting to develop oral dosage forms of zoledronic acid for various indications, Merrion Pharmaceuticals plc and Thar Pharmaceuticals, Inc.

AXS-05 Competition

        There is one product approved for the treatment of TRD, Symbyax, which is marketed by Eli Lilly and Company. In addition, Otsuka Pharmaceutical Co. Ltd. is working to develop a combination of DM and quinidine for the treatment of TRD. We are aware of several other companies developing compounds for the treatment of TRD including Alkermes plc; Allergan plc; and Janssen Research & Development, LLC. We are aware of other companies working to develop therapeutics for the treatment of agitation in patients with AD, including Otsuka Pharmaceutical Co. Ltd., which is working to develop a combination of DM and quinidine in this indication; and Transition Therapeutics Inc.

Manufacturing

        Manufacturing of drugs and product candidates, including AXS-02 and AXS-05, must comply with FDA current good manufacturing practice, or cGMP, regulations. AXS-02 and AXS-05 comprise synthetic small molecules made through a series of organic chemistry steps starting with commercially available organic chemical raw materials. We do not currently own or operate any manufacturing facilities for the clinical or commercial production of our drug candidates. We conduct manufacturing activities under individual purchase orders with independent contract manufacturing organizations, or CMOs, to supply our clinical trials. We conduct periodic quality audits of their facilities. We believe that our existing suppliers of AXS-02 and AXS-05 active pharmaceutical ingredients and finished products will be capable of providing sufficient quantities of each to meet our clinical trial supply needs. Other CMOs may be used in the future for clinical supplies and, subject to approval, commercial manufacturing.

Government Regulation and Product Approval

        Government authorities in the United States, at the federal, state, and local level, and in other countries, extensively regulate, among other things, the research, development, testing, manufacture, packaging, storage, recordkeeping, labeling, advertising, promotion, distribution, marketing, import, and export of pharmaceutical products such as those we are developing. In addition, manufacturers of pharmaceutical products participating in Medicaid and Medicare are required to comply with mandatory price reporting, discount, and rebate requirements. The processes for obtaining regulatory approvals in the United States and in foreign countries, along with subsequent compliance with applicable statutes and regulations, require the expenditure of substantial time and financial resources.

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FDA Regulation

        In the United States, the FDA regulates drugs under the Federal Food, Drug, and Cosmetic Act, or FDCA, and its implementing regulations. The process required by the FDA before product candidates may be marketed in the United States generally involves the following:

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completion of preclinical laboratory tests, animal studies, and formulation studies in compliance with the FDA's Good Laboratory Practice, or GLP, regulations;



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submission to the FDA of an IND which must become effective before human clinical trials may begin;



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approval by an independent Institutional Review Board, or IRB, for each clinical site, or centrally, before each trial may be initiated;



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adequate and well-controlled human clinical trials to establish the safety and efficacy of the proposed drug candidates for its intended use, performed in accordance with current Good Clinical Practices, or GCP;



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development of manufacturing processes to ensure the drug's identity, strength, quality, and purity;



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submission to the FDA of an NDA;



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satisfactory completion of an FDA advisory committee review, if applicable;



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satisfactory completion of an FDA inspection of the manufacturing facility or facilities at which the product is produced to assess compliance with cGMPs, and to assure that the facilities, methods, and controls are adequate to preserve the drug's identity, strength, quality, and purity, as well as satisfactory completion of an FDA inspection of selected clinical sites and selected clinical investigators to determine GCP compliance; and



•

FDA review and approval of the NDA to permit commercial marketing for particular indications for use.

Preclinical Studies and IND Submission

        The testing and approval process of product candidates requires substantial time, effort, and financial resources. Preclinical studies include laboratory evaluation of drug substance chemistry, pharmacology, toxicity, and drug product formulation, as well as animal studies to assess potential safety and efficacy. Such studies must generally be conducted in accordance with the FDA's Good Laboratory Practices. Prior to commencing the first clinical trial with a product candidate, an IND sponsor must submit the results of the preclinical tests and preclinical literature, together with manufacturing information, analytical data, any available clinical data or literature, and proposed clinical study protocols among other things, to the FDA as part of an IND. In the case of 505(b)(2) applications, though, some of the IND components may not be required. Some preclinical testing may continue even after the IND is submitted.

        An IND automatically becomes effective 30 days after receipt by the FDA, unless the FDA, within the 30-day time period, notifies the applicant of safety concerns or questions related to one or more proposed clinical trials and places the trial on a clinical hold. In such a case, the IND sponsor and the FDA must resolve any outstanding concerns before the clinical trial can begin. Clinical holds also may be imposed by the FDA at any time before or during trials due to safety concerns or non-compliance. As a result, submission of an IND may not result in FDA authorization to commence a clinical trial.

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Clinical Trials

        Clinical trials involve the administration of the investigational new drug to human subjects under the supervision of qualified investigators in accordance with GCP requirements, which include the requirements that all research subjects provide their informed consent in writing for their participation in any clinical trial, as well as review and approval of the study by an IRB. Investigators must also provide certain information to the clinical trial sponsors to allow the sponsors to make certain financial disclosures to the FDA. Clinical trials are conducted under protocols detailing, among other things, the objectives of the trial, the trial procedures, the parameters to be used in monitoring safety, the effectiveness criteria to be evaluated, and a statistical analysis plan. A protocol for each clinical trial, and any subsequent protocol amendments, must be submitted to the FDA as part of the IND. In addition, an IRB at each study site participating in the clinical trial or a central IRB must review and approve the plan for any clinical trial, informed consent forms, and communications to study subjects before a study commences at that site. An IRB considers, among other things, whether the risks to individuals participating in the trials are minimized and are reasonable in relation to anticipated benefits and whether the planned human subject protections are adequate. The IRB must continue to oversee the clinical trial while it is being conducted. Once an IND is in effect, each new clinical protocol and any amendments to the protocol must be submitted to the IND for FDA review, and to the IRB for approval. Progress reports detailing the results of the clinical trials must also be submitted at least annually to the FDA and the IRB and more frequently if serious adverse events or other significant safety information is found.

        Information about certain clinical trials, including a description of the study and study results, must be submitted within specific timeframes to the National Institutes of Health, or NIH, for public dissemination on their clinicaltrials.gov website.

        Additionally, some clinical trials are overseen by an independent group of qualified experts organized by the clinical trial sponsor, known as a data safety monitoring board or committee. This group regularly reviews accumulated data and advises the study sponsor regarding the continuing safety of trial subjects, potential trial subjects, and the continuing validity and scientific merit of the clinical trial. The data safety monitoring board receives special access to unblinded data during the clinical trial and may advise the sponsor to halt the clinical trial if it determined there is an unacceptable safety risk for subjects or on other grounds, such as no demonstration of efficacy.

        The manufacture of investigational drugs for the conduct of human clinical trials is subject to cGMP requirements. Investigational drugs and active pharmaceutical ingredients imported into the United States are also subject to regulation by the FDA relating to their labeling and distribution. Further, the export of investigational drug products outside of the United States is subject to regulatory requirements of the receiving country as well as U.S. export requirements under the FDCA.

        In general, for purposes of NDA approval, human clinical trials are typically conducted in three sequential phases, which may overlap or be combined.

•

Phase 1—Studies are initially conducted in healthy human volunteers or subjects with the target disease or condition and test the product candidate for safety, dosage tolerance, structure-activity relationships, mechanism of action, absorption, metabolism, distribution, and excretion. If possible, Phase 1 trials may also be used to gain an initial indication of product effectiveness.



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Phase 2—Controlled studies are conducted in limited subject populations with a specified disease or condition to evaluate preliminary efficacy, identify optimal dosages, dosage tolerance and schedule, possible adverse effects and safety risks, and expanded evidence of safety.



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Phase 3—These adequate and well-controlled clinical trials are undertaken in expanded subject populations, generally at geographically dispersed clinical trial sites, to generate enough data to provide statistically significant evidence of clinical efficacy and safety of the product for

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approval, to establish the overall risk-benefit profile of the product, and to provide adequate information for the labeling of the product. Typically, two Phase 3 trials are required by the FDA for product approval.

        The FDA may also require, or companies may conduct, additional clinical trials for the same indication after a product is approved. These so-called Phase 4 studies may be made a condition to be satisfied after approval. The results of Phase 4 studies can confirm the effectiveness of a product candidate and can provide important safety information.

        In the case of a 505(b)(2) NDA, which is a marketing application in which sponsors may rely on investigations that were not conducted by or for the applicant and for which the applicant has not obtained a right of reference or use from the person by or for whom the investigations were conducted, some of the above-described studies and preclinical studies may not be required or may be abbreviated. Bridging studies may be needed, however, to demonstrate the applicability of the studies that were previously conducted by other sponsors to the drug that is the subject of the marketing application.

        Phase 1, Phase 2, and Phase 3 clinical trials may not be completed successfully within any specified period, or at all. Regulatory authorities, an IRB, or the sponsor may suspend or discontinue a clinical trial at any time on various grounds, including a finding that the subjects are being exposed to an unacceptable health risk, the clinical trial is not being conducted in accordance with the FDA's or the IRB's requirements, if the drug has been associated with unexpected serious harm to the subjects, or based on evolving business objectives or competitive climate.

        Concurrent with clinical trials, companies usually complete additional animal studies and must also develop additional information about the chemistry and physical characteristics of the product candidate as well as finalize a process for manufacturing the product in commercial quantities in accordance with cGMP requirements. The manufacturing process must be capable of consistently producing quality batches of the product candidate and, among other things, must develop methods for testing the identity, strength, quality, potency, and purity of the final product. Additionally, appropriate packaging must be selected and tested, and stability studies must be conducted to demonstrate that the product candidate does not undergo unacceptable deterioration over its shelf life.

        During the development of a new drug, a sponsor may be able to request a Special Protocol Assessment, or SPA, the purpose of which is to reach agreement with the FDA on the Phase 3 clinical trial protocol design and analysis that will form the primary basis of an efficacy claim as well as preclinical carcinogenicity trials and stability studies. An SPA may only be modified with the agreement of the FDA and the trial sponsor or if the director of the FDA reviewing division determines that a substantial scientific issue essential to determining the safety or efficacy of the drug was identified after the testing began. An SPA is intended to provide assurance that, in the case of clinical trials, if the agreed upon clinical trial protocol is followed, the clinical trial endpoints are achieved, and there is a favorable risk-benefit profile, the data may serve as the primary basis for an efficacy claim in support of an NDA. However, SPA agreements are not a guarantee of an approval of a product candidate or any permissible claims about the product candidate. In particular, SPAs are not binding on the FDA if, among other reasons, previously unrecognized public health concerns arise during the performance of the clinical trial, other new scientific concerns regarding the product candidate's safety or efficacy arise, or if the sponsoring company fails to comply with the agreed upon clinical trial protocol.

NDA Submission, Review by the FDA, and Marketing Approval

        Assuming successful completion of the required clinical and preclinical testing, the results of product development, including chemistry, manufacture, and controls, non-clinical studies, and clinical trial results, including negative or ambiguous results as well as positive findings, are all submitted to the FDA, along with the proposed labeling, as part of an NDA requesting approval to market the product for one or more indications. In most cases, the submission of an NDA is subject to a substantial

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application user fee. These user fees must be paid at the time of the first submission of the application, even if the application is being submitted on a rolling basis. Fee waivers or reductions are available in certain circumstances. One basis for a waiver of the application user fee is if the applicant employs fewer than 500 employees, including employees of affiliates, the applicant does not have an approved marketing application for a product that has been introduced or delivered for introduction into interstate commerce, and the applicant, including its affiliates, is submitting its first marketing application. Product candidates that are designated as orphan drugs, which are further described below, are also not subject to application user fees unless the application includes an indication other than the orphan indication.

        In addition, under the Pediatric Research Equity Act, or PREA, an NDA or supplement to an NDA for a new active ingredient, indication, dosage form, dosage regimen, or route of administration, must contain data that are adequate to assess the safety and effectiveness of the drug for the claimed indications in all relevant pediatric subpopulations, and to support dosing and administration for each pediatric subpopulation for which the product is safe and effective. The FDA may, on its own initiative or at the request of the applicant, grant deferrals for submission of some or all pediatric data until after approval of the product for use in adults, or full or partial waivers from the pediatric data requirements. The FDA also may require submission of a risk evaluation and mitigation strategy, or REMS, to ensure that the benefits of the drug outweigh the risks of the drug. The REMS plan could include medication guides, physician communication plans, and elements to assure safe use, such as restricted distribution methods, patient registries, or other risk minimization tools. An assessment of the REMS must also be conducted at set intervals. Following product approval, a REMS may also be required by the FDA if new safety information is discovered and the FDA determines that a REMS is necessary to ensure that the benefits of the drug outweigh the risks of the drug.

        Once the FDA receives an application, it has 60 days to review the NDA to determine if it is substantially complete to permit a substantive review, before it accepts the application for filing. The FDA may request additional information rather than accept an NDA for filing. In this event, the application must be resubmitted with the additional information. The resubmitted application is also subject to review before the FDA accepts it for filing. Once the submission is accepted for filing, the FDA begins an in-depth substantive review of the NDA.

        Under the goals and policies agreed to by the FDA under the Prescription Drug User Fee Act, or PDUFA, the FDA has set the review goal of completing its review of 90% of all applications within ten months from the 60-day filing date for its initial review of a standard NDA for a New Molecular Entity, or NME. For non-NME standard applications, the FDA has set the goal of completing its review of 90% of all applications within ten months from the submission date. Such deadlines are referred to as the PDUFA date. The PDUFA date is only a goal, thus, the FDA does not always meet its PDUFA dates. The review process and the PDUFA date may also be extended if the FDA requests or the NDA sponsor otherwise provides substantial additional information or clarification regarding the submission.

        The FDA must refer applications for drugs that contain active ingredients, including any ester or salt of the active ingredients, that have not previously been approved by the FDA to an advisory committee or provide in an action letter a summary for not referring it to an advisory committee. The FDA may also refer drugs to advisory committees when it is determined that an advisory committee's expertise would be beneficial to the regulatory decision-making process, including the evaluation of novel products and the use of new technology. An advisory committee is typically a panel that includes clinicians and other experts, which review, evaluate, and make a recommendation as to whether the application should be approved and under what conditions. The FDA is not bound by the recommendations of an advisory committee, but it considers such recommendations carefully when making decisions.

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        The FDA reviews applications to determine, among other things, whether a product is safe and effective for its intended use and whether the manufacturing methods and controls are adequate to assure and preserve the product's identity, strength, quality, safety, potency, and purity. Before approving an NDA, the FDA typically will inspect the facility or facilities where the product is manufactured, referred to as a Pre-Approval Inspection. The FDA will not approve an application unless it determines that the manufacturing processes and facilities, including contract manufacturers and subcontractors, are in compliance with cGMP requirements and adequate to assure consistent production of the product within required specifications. Additionally, before approving an NDA the FDA will inspect one or more clinical trial sites to assure compliance with GCPs.

        The approval process is lengthy and difficult and the FDA may refuse to approve an NDA if the applicable regulatory criteria are not satisfied or may require additional clinical data or other data and information. Even if such data and information are submitted, the FDA may ultimately decide that the NDA does not satisfy the criteria for approval. Data obtained from clinical trials are not always conclusive and the FDA may interpret data differently than an applicant interprets the same data.

        After evaluating the NDA and all related information, including the advisory committee recommendation, if any, and inspection reports regarding the manufacturing facilities and clinical trial sites, the FDA may issue an approval letter, or, in some cases, a Complete Response Letter, or CRL. If a CRL is issued, the applicant may either: resubmit the NDA, addressing all of the deficiencies identified in the letter; withdraw the application; or request an opportunity for a hearing. A CRL indicates that the review cycle of the application is complete and the application is not ready for approval and describes all of the specific deficiencies that the FDA identified in the NDA. A CRL generally contains a statement of specific conditions that must be met in order to secure final approval of the NDA, and may require additional clinical or preclinical testing in order for the FDA to reconsider the application. The deficiencies identified may be minor, for example, requiring labeling changes; or major, for example, requiring additional clinical trials. The FDA has the goal of reviewing 90% of application resubmissions in either two or six months of the resubmission date, depending on the kind of resubmission. Even with submission of this additional information, the FDA ultimately may decide that the application does not satisfy the regulatory criteria for approval. If and when those conditions have been met to the FDA's satisfaction, the FDA may issue an approval letter. An approval letter authorizes commercial marketing of the drug with specific prescribing information for specific indications.

        Even if the FDA approves a product, it may limit the approved indications for use of the product, require that contraindications, warnings, or precautions be included in the product labeling, including a boxed warning, require that post-approval studies, including Phase 4 clinical trials, be conducted to further assess a drug's safety after approval, require testing and surveillance programs to monitor the product after commercialization, or impose other conditions, including distribution restrictions or other risk management mechanisms under a REMS which can materially affect the potential market and profitability of the product. The FDA may also not approve label statements that are necessary for successful commercialization and marketing.

        After approval, some types of changes to the approved product, such as adding new indications, manufacturing changes, and additional labeling claims, are subject to further testing requirements and FDA review and approval. The FDA may also withdraw the product approval if compliance with the pre- and post-marketing regulatory standards are not maintained or if problems occur after the product reaches the marketplace. Further, should new safety information arise, additional testing, product labeling, or FDA notification may be required.

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505(b)(2) Approval Process

        Section 505(b)(2) of the FDCA, provides an alternate regulatory pathway to FDA approval for new or improved formulations or new uses of previously approved drug products. Specifically, Section 505(b)(2) was enacted as part of the Drug Price Competition and Patent Term Restoration Act of 1984, commonly referred to as the Hatch-Waxman Amendments, and permits the filing of an NDA where at least some of the information required for approval comes from studies not conducted by or for the applicant and for which the applicant has not obtained a right of reference or use from the person by or for whom the investigations were conducted. The applicant may rely upon the FDA's prior findings of safety and effectiveness for an approved product that acts as the reference listed drug or on published scientific literature, in support of its application. The FDA may also require 505(b)(2) applicants to perform additional studies or measurements to support the changes from the reference listed drug as well as bridging studies to the reference listed drug. The FDA may then approve the new product candidate for all or some of the labeled indications for which the referenced product has been approved, as well as for any new indication sought by the Section 505(b)(2) applicant.

Orange Book Listing

        Section 505 of the FDCA describes three types of marketing applications that may be submitted to the FDA to request marketing authorization for a new drug. A Section 505(b)(1) NDA is an application that contains full reports of investigations of safety and efficacy. A Section 505(b)(2) NDA, is an application in which the applicant, in part, relies on investigations that were not conducted by or for the applicant and for which the applicant has not obtained a right of reference or use from the person by or for whom the investigations were conducted. Section 505(j) establishes an abbreviated approval process for a generic version of approved drug products through the submission of an Abbreviated New Drug Application, or ANDA. An ANDA provides for marketing of a generic drug product that has the same active ingredients, dosage form, strength, route of administration, labeling, performance characteristics, and intended use, among other things, to a previously approved product. Limited changes must be pre-approved by the FDA via a suitability petition. ANDAs are termed "abbreviated" because they are generally not required to include preclinical and clinical data to establish safety and efficacy. Instead, generic applicants must scientifically demonstrate that their product is bioequivalent to, or performs in the same manner as, the innovator drug through in vitro, in vivo, or other testing. The generic version must deliver the same amount of active ingredients into a subject's bloodstream in the same amount of time as the innovator drug and can often be substituted by pharmacists under prescriptions written for the reference listed drug.

        In seeking approval for a drug through an NDA, including a 505(b)(2) NDA, applicants are required to list with the FDA certain patents whose claims cover the applicant's product and method of use. Upon approval of an NDA, each of the patents listed in the application for the drug is then published in Approved Drug Products with Therapeutic Equivalence Evaluations, also known as the Orange Book. These products may be cited by potential competitors in support of approval of an ANDA or 505(b)(2) NDA.

        Any applicant who files an abbreviated new drug application, or ANDA, seeking approval of a generic equivalent version of a drug listed in the Orange Book or a 505(b)(2) NDA referencing a drug listed in the Orange Book must make patent certifications to the FDA that (1) no patent information on the drug or method of use that is the subject of the application has been submitted to the FDA; (2) the patent has expired; (3) the date on which the patent has expired and approval will not be sought until after the patent expiration; or (4) the patent is invalid or will not be infringed upon by the manufacture, use, or sale of the drug product for which the application is submitted. The last certification is known as a paragraph IV certification. Generally, the ANDA or 505(b)(2) NDA cannot be approved until all listed patents have expired, except where the ANDA or 505(b)(2) NDA applicant challenges a listed patent through a paragraph IV certification or if the applicant is not seeking

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approval of a patented method of use. If the applicant does not challenge the listed patents or does not indicate that it is not seeking approval of a patented method of use, the ANDA or 505(b)(2) NDA application will not be approved until all of the listed patents claiming the referenced product have expired.

        If the competitor has provided a paragraph IV certification to the FDA, the competitor must also send notice of the paragraph IV certification to the holder of the NDA for the reference listed drug and the patent owner within 20 days after the application has been accepted for filing by the FDA. The NDA holder or patent owner may then initiate a patent infringement lawsuit in response to the notice of the paragraph IV certification. The filing of a patent infringement lawsuit within 45 days of the receipt of a paragraph IV certification notice prevents the FDA from approving the ANDA or 505(b)(2) application until the earlier of 30 months from the date of the lawsuit, expiration of the patent, settlement of the lawsuit, a decision in the infringement case that is favorable to the applicant or such shorter or longer period as may be ordered by a court. This prohibition is generally referred to as the 30-month stay.

        In instances where an ANDA or 505(b)(2) NDA applicant files a paragraph IV certification, the NDA holder or patent owners regularly take action to trigger the 30-month stay, recognizing that the related patent litigation may take many months or years to resolve. Thus, approval of an ANDA or 505(b)(2) NDA could be delayed for a significant period of time depending on the patent certification the applicant makes and the reference drug sponsor's decision to initiate patent litigation.

Exclusivity

        Market exclusivity provisions under the FDCA can also delay the submission or the approval of certain applications. The FDA provides periods of regulatory exclusivity, which provides the holder of an approved NDA limited protection from new competition in the marketplace for the innovation represented by its approved drug. Five years of exclusivity are available to New Chemical Entities, or NCEs. An NCE is a drug that contains no active moiety that has been approved by the FDA in any other NDA. An active moiety is the molecule or ion excluding those appended portions of the molecule that cause the drug to be an ester, salt, including a salt with hydrogen or coordination bonds, or other noncovalent derivatives, such as a complex, chelate, or clathrate, of the molecule, responsible for the therapeutic activity of the drug substance. During the exclusivity period, the FDA may not accept for review and approve an ANDA or a 505(b)(2) NDA submitted by another company that contains the previously approved active moiety. An ANDA or 505(b)(2) application, however, may be submitted one year before NCE exclusivity expires if a paragraph IV certification is filed.

        If a product is not eligible for the NCE exclusivity, it may be eligible for three years of exclusivity. Three-year exclusivity is available to the holder of an NDA, including a 505(b)(2) NDA, for a particular condition of approval, or change to a marketed product, such as a new formulation or indication for a previously approved product, if one or more new clinical studies, other than bioavailability or bioequivalence studies, was essential to the approval of the application and was conducted or sponsored by the applicant. This three-year exclusivity period protects against FDA approval of ANDAs and 505(b)(2) NDAs for the condition of the new drug's approval. As a general matter, the three year exclusivity does not prohibit the FDA from approving ANDAs or 505(b)(2) NDAs for generic versions of the original, unmodified drug product. Five-year and three-year exclusivity will also not delay the submission or approval of a full NDA; however, an applicant submitting a full NDA would be required to conduct or obtain a right of reference to all of the preclinical studies and adequate and well-controlled clinical trials necessary to demonstrate safety and efficacy. Moreover, even if a product receives a period of exclusivity, a physician may prescribe the reference listed drug or a generic version of the reference listed drug off-label for the same use as the newly approved drug.

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        Pediatric exclusivity is another type of non-patent marketing exclusivity in the United States and, if granted, provides for the attachment of an additional six months of marketing protection to the term of any existing regulatory exclusivity, including the non-patent exclusivity period described above. This six-month exclusivity may be granted if an NDA sponsor submits pediatric data that fairly respond to a written request from the FDA for such data. The data do not need to show the product to be effective in the pediatric population studied; rather, if the clinical trial is deemed to fairly respond to the FDA's request, the additional protection is granted. If reports of requested pediatric studies are submitted to and accepted by the FDA within the statutory time limits, whatever statutory or regulatory periods of exclusivity or Orange Book listed patent protection cover the drug are extended by six months. This is not a patent term extension, but it effectively extends the regulatory period during which the FDA cannot approve an ANDA or 505(b)(2) application owing to regulatory exclusivity or listed patents. Moreover, pediatric exclusivity attaches to all formulations, dosage forms, and indications for products with existing marketing exclusivity or patent life that contain the same active moiety as that which was studied.

        The Orphan Drug Act provides incentives for the development of drugs intended to treat rare diseases or conditions, which generally are diseases or conditions affecting less than 200,000 individuals annually in the United States, or affecting more than 200,000 in the United States and for which there is no reasonable expectation that the cost of developing and making the drug available in the United States will be recovered from United States sales. Additionally, sponsors must present a plausible hypothesis for clinical superiority to obtain orphan designation if there is a drug already approved by the FDA that is intended for the same indication and that is considered by the FDA to be the same drug as the already approved drug. This hypothesis must be demonstrated to obtain orphan drug exclusivity. If granted, prior to product approval, Orphan Drug Designation entitles a party to financial incentives such as opportunities for grant funding towards clinical study costs, tax advantages, and user-fee waivers. In addition, if a product receives FDA approval for the indication for which it has orphan designation, the product is generally entitled to orphan drug exclusivity, which means the FDA may not approve any other application to market the same drug for the same indication for a period of seven years, except in limited circumstances, such as a showing of clinical superiority over the product with orphan exclusivity.

Special FDA Expedited Review and Approval Programs

        The FDA has various programs, including Fast Track designation, priority review and breakthrough designation, that are intended to expedite or simplify the process for the development and FDA review of certain drug products that are intended for the treatment of serious or life threatening diseases or conditions, and demonstrate the potential to address unmet medical needs or present a significant improvement over existing therapy. The purpose of these programs is to provide important new drugs to patients earlier than under standard FDA review procedures.

        To be eligible for a Fast Track designation, the FDA must determine, based on the request of a sponsor, that a product is intended to treat a serious or life threatening disease or condition and demonstrates the potential to address an unmet medical need. The FDA will determine that a product will fill an unmet medical need if the product will provide a therapy where none exists or provide a therapy that may be potentially superior to existing therapy based on efficacy, safety, or public health factors. If Fast Track designation is obtained, drug sponsors may be eligible for more frequent development meetings and correspondence with the FDA. In addition, the FDA may initiate review of sections of an NDA before the application is complete. This "rolling review" is available if the applicant provides and the FDA approves a schedule for the remaining information. In some cases, a Fast Track product may be eligible for accelerated approval or priority review.

        The FDA may give a priority review designation to drugs that are intended to treat serious conditions and, if approved, would provide significant improvements in the safety or effectiveness of the

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treatment, diagnosis, or prevention of serious conditions. A priority review means that the goal for the FDA is to review an application within six months, rather than the standard review of ten months under current PDUFA guidelines, of the 60-day filing date for NMEs and within six months of the submission date for non-NMEs. Products that are eligible for Fast Track designation may also be considered appropriate to receive a priority review.

        Moreover, under the provisions of the Food and Drug Administration Safety and Innovation Act, or FDASIA, enacted in 2012, a sponsor can request designation of a product candidate as a "breakthrough therapy." A breakthrough therapy is defined as a drug that is intended, alone or in combination with one or more other drugs, to treat a serious or life-threatening disease or condition, and preliminary clinical evidence indicates that the drug may demonstrate substantial improvement over existing therapies on one or more clinically significant endpoints, such as substantial treatment effects observed early in clinical development. Drugs designated as breakthrough therapies are eligible for the Fast Track designation features as described above, intensive guidance on an efficient drug development program beginning as early as Phase 1 trials, and a commitment from the FDA to involve senior managers and experienced review staff in a proactive collaborative, cross-disciplinary review.

        Even if a product qualifies for one or more of these programs, the FDA may later decide that the product no longer meets the conditions for qualification or decide that the time period for FDA review or approval will not be shortened.

Post-approval Requirements

        Any product manufactured or distributed pursuant to FDA approvals are subject to pervasive and continuing regulation by the FDA, including, among other things, requirements related to manufacturing, recordkeeping, and reporting, including adverse experience reporting, drug shortage reporting, and periodic reporting, product sampling and distribution, advertising, marketing, promotion, certain electronic records and signatures, and post-approval obligations imposed as a condition of approval, such as Phase 4 clinical trials, REMS, and surveillance to assess safety and effectiveness after commercialization.

        After approval, most changes to the approved product, such as adding new indications or other labeling claims are subject to prior FDA review and approval. There also are continuing annual user fee requirements for any marketed products and the establishments at which such products are manufactured, as well as new application fees for supplemental applications with clinical data. In addition, drug manufacturers and other entities involved in the manufacture and distribution of approved drugs are required to register their establishments with the FDA and certain state agencies, list their drug products, and are subject to periodic announced and unannounced inspections by the FDA and these state agencies for compliance with cGMP and other requirements, which impose certain procedural and documentation requirements upon the company and third-party manufacturers.

        Changes to the manufacturing process are strictly regulated and often require prior FDA approval or notification before being implemented. FDA regulations also require investigation and correction of any deviations from cGMP and specifications, and impose reporting and documentation requirements upon the sponsor and any third-party manufacturers that the sponsor may decide to use. Accordingly, manufacturers must continue to expend time, money, and effort in the area of production and quality control to maintain cGMP compliance.

        The FDA also strictly regulates marketing, labeling, advertising, and promotion of products that are placed on the market. A company can make only those claims relating to safety and efficacy, purity, and potency that are approved by the FDA. Physicians, in their independent professional medical judgment, may prescribe legally available products for unapproved indications that are not described in the product's labeling and that differ from those tested and approved by the FDA. Pharmaceutical companies, however, are required to promote their drug products only for the approved indications and

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in accordance with the provisions of the approved label. The FDA and other agencies actively enforce the laws and regulations prohibiting the promotion of off-label uses, and a company that is found to have improperly promoted off-label uses may be subject to significant liability, including, but not limited to, criminal and civil penalties under the FDCA and False Claims Act, exclusion from participation in federal healthcare programs, mandatory compliance programs under corporate integrity agreements, debarment, and refusal of government contracts.

        In addition, the distribution of prescription pharmaceutical products is subject to the Prescription Drug Marketing Act, or PDMA, which regulates the distribution of drugs and drug samples at the federal level, and sets minimum standards for the registration and regulation of drug distributors by the states. Both the PDMA and state laws limit the distribution of prescription pharmaceutical product samples and impose requirements to ensure accountability in distribution.

        Moreover, the recently enacted Drug Quality and Security Act, or DQSA, imposes new obligations on manufacturers of pharmaceutical products related to product tracking and tracing. Among the requirements of this new legislation, manufacturers will be required to provide certain information regarding the drug products to individuals and entities to which product ownership is transferred, label drug product with a product identifier, and keep certain records regarding the drug product. The transfer of information to subsequent product owners by manufacturers will eventually be required to be done electronically. Manufacturers will also be required to verify that purchasers of the manufacturers' products are appropriately licensed. Further, under this new legislation, manufactures will have drug product investigation, quarantine, disposition, and notification responsibilities related to counterfeit, diverted, stolen, and intentionally adulterated products that would result in serious adverse health consequences of death to humans, as well as products that are the subject of fraudulent transactions or which are otherwise unfit for distribution such that they would be reasonably likely to result in serious health consequences or death.

        Later discovery of previously unknown problems with a product, including adverse events of unanticipated severity or frequency, or with manufacturing processes, or failure to comply with regulatory requirements, may result in significant regulatory actions. Such actions may include refusal to approve pending applications, license suspension or revocation, withdrawal of an approval, imposition of a clinical hold or termination of clinical trials, warning letters, untitled letters, cyber letters, modification of promotional materials or labeling, provision of corrective information, imposition of post-market requirements including the need for additional testing, imposition of distribution or other restrictions under a REMS, product recalls, product seizures or detentions, refusal to allow imports or exports, total or partial suspension of production or distribution, FDA debarment, injunctions, fines, consent decrees, corporate integrity agreements, debarment from receiving government contracts, and new orders under existing contracts, exclusion from participation in federal and state healthcare programs, restitution, disgorgement, or civil or criminal penalties, including fines and imprisonment, and result in adverse publicity, among other adverse consequences.

Fraud and Abuse, Data Privacy and Security, and Transparency Laws and Regulations

        Our business activities, including but not limited to, research, sales, promotion, distribution, medical education, and other activities following product approval will be subject to regulation by numerous federal and state regulatory and law enforcement authorities in the United States in addition to the FDA, including potentially the Department of Justice, the Department of Health and Human Services and its various divisions, including the Centers for Medicare & Medicaid Services, or CMS, and the Health Resources and Services Administration, the Department of Veterans Affairs, the Department of Defense, and state and local governments. Our business activities must comply with numerous healthcare laws, including but not limited to, anti-kickback and false claims laws and regulations as well as data privacy and security laws and regulations, which are described below.

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        The federal Anti-Kickback Statute prohibits, among other things, any person or entity, from knowingly and willfully offering, paying, soliciting, or receiving any remuneration, directly or indirectly, overtly or covertly, in cash or in kind, to induce or in return for purchasing, leasing, ordering, or arranging for or recommending the purchase, lease, furnishing, or order of any item or service reimbursable under Medicare, Medicaid, or other federal healthcare programs, in whole or in part. The term "remuneration" has been interpreted broadly to include anything of value. The Anti-Kickback Statute has been interpreted to apply to arrangements between pharmaceutical manufacturers on one hand and prescribers, purchasers, formulary managers, and beneficiaries on the other. There are certain statutory exceptions and regulatory safe harbors protecting some common activities from prosecution. The exceptions and safe harbors are drawn narrowly, and practices that involve remuneration that may be alleged to be intended to induce prescribing, purchases, or recommendations may be subject to scrutiny if they do not qualify for an exception or safe harbor. Failure to meet all of the requirements of a particular applicable statutory exception or regulatory safe harbor does not make the conduct per se illegal under the Anti-Kickback Statute. Instead, the legality of the arrangement will be evaluated on a case-by-case basis based on a cumulative review of all of its facts and circumstances. Several courts have interpreted the statute's intent requirement to mean that if any one purpose of an arrangement involving remuneration is to induce referrals of federal healthcare covered business, the statute has been violated. The Patient Protection and Affordable Care Act, or ACA, of 2010, as amended, modified the intent requirement under the Anti-Kickback Statute to a stricter standard, such that a person or entity no longer needs to have actual knowledge of the statute or specific intent to violate it in order to have committed a violation. In addition, the ACA also provided that a violation of the federal Anti-Kickback Statute is grounds for the government or a whistleblower to assert that a claim for payment of items or services resulting from such violation constitutes a false or fraudulent claim for purposes of the federal civil False Claims Act.

        The federal civil False Claims Act, or FCA, prohibits, among other things, any person or entity from knowingly presenting, or causing to be presented, a false or fraudulent claim for payment to, or approval by, the federal government, knowingly making, using, or causing to be made or used a false record or statement material to a false or fraudulent claim to the federal government, or avoiding, decreasing, or concealing an obligation to pay money to the federal government. A claim includes "any request or demand" for money or property presented to the U.S. government. The civil False Claims Act has been used to assert liability on the basis of kickbacks and other improper referrals, improperly reported government pricing metrics such as Best Price or Average Manufacturer Price, improper use of Medicare provider or supplier numbers when detailing a provider of services, improper promotion of off-label uses not expressly approved by the FDA in a drug's label, and allegations as to misrepresentations with respect to the services rendered. Several pharmaceutical and other healthcare companies have further been sued under these laws for allegedly providing free product to customers with the expectation that the customers would bill federal programs for the product. Intent to deceive is not required to establish liability under the civil False Claims Act. Civil False Claims Act actions may be brought by the government or may be brought by private individuals on behalf of the government, called "qui tam" actions. If the government decides to intervene in a qui tam action and prevails in the lawsuit, the individual will share in the proceeds from any fines or settlement funds. If the government declines to intervene, the individual may pursue the case alone. Since 2004, these False Claims Act lawsuits against pharmaceutical companies have increased significantly in volume and breadth, leading to several substantial civil and criminal settlements, as much as $3.0 billion, regarding certain sales practices and promoting off label drug uses. Civil False Claims act liability may be imposed for Medicare or Medicaid overpayments, for example, overpayments caused by understated rebate amounts, that are not refunded within 60 days of discovering the overpayment, even if the overpayment was not caused by a false or fraudulent act.

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        The government may further prosecute conduct constituting a false claim under the criminal False Claims Act. The criminal False Claims Act prohibits the making or presenting of a claim to the government knowing such claim to be false, fictitious, or fraudulent and, unlike the civil False Claims Act, requires proof of intent to submit a false claim.

        The civil monetary penalties statute is another potential statute under which biopharmaceutical companies may be subject to enforcement. Among other things, the civil monetary penalties statue imposes fines against any person who is determined to have presented, or caused to be presented, claims to a federal healthcare program that the person knows, or should know, is for an item or service that was not provided as claimed or is false or fraudulent.

        Payment or reimbursement of prescription drugs by Medicaid or Medicare requires manufacturers of the drugs to submit pricing information to CMS. The Medicaid Drug Rebate statute requires manufacturers to calculate and report price points, which are used to determine Medicaid rebate payments shared between the states and the federal government and Medicaid payment rates for the drug. For drugs paid under Medicare Part B, manufacturers must also calculate and report their Average Sales Price, which is used to determine the Medicare Part B payment rate for the drug. Drugs that are approved under a Biologic License Application, or BLA, or an NDA, including 505(b)(2) drugs, are subject to an additional inflation penalty which can substantially increase rebate payments. In addition, for BLA and NDA drugs, the Veterans Health Care Act, or VHCA, requires manufacturers to calculate and report to the Veterans Administration, or VA, a different price called the Non-Federal Average Manufacturing Price, which is used to determine the maximum price that can be charged to certain federal agencies, referred to as the Federal Ceiling Price, or FCP. Like the Medicaid rebate amount, the FCP includes an inflation penalty. A Department of Defense regulation requires manufacturers to provide this discount on drugs dispensed by retail pharmacies when paid by the TRICARE Program. All of these price reporting requirements create risk of submitting false information to the government, and potential FCA liability.

        The VHCA also requires manufacturers of covered drugs participating in the Medicaid program to enter into Federal Supply Schedule contracts with the VA through which their covered drugs must be sold to certain federal agencies at FCP and to report pricing information. This necessitates compliance with applicable federal procure laws and regulations and subjects us to contractual remedies as well as administrative, civil, and criminal sanctions. In addition, the VHCA requires manufacturers participating in Medicaid to agree to provide different mandatory discounts to certain Public Health Service grantees and other safety net hospitals and clinics.

        The federal Health Insurance Portability and Accountability Act of 1996, or HIPAA, also created federal criminal statutes that prohibit knowingly and willfully executing, or attempting to execute, a scheme to defraud or to obtain, by means of false or fraudulent pretenses, representations or promises, any of the money or property owned by, or under the custody or control of, a healthcare benefit program, regardless of whether the payor is public or private, knowingly and willfully embezzling or stealing from a health care benefit program, willfully obstructing a criminal investigation of a health care offense and knowingly and willfully falsifying, concealing, or covering up by any trick or device a material fact or making any materially false statements in connection with the delivery of, or payment for, healthcare benefits, items, or services relating to healthcare matters. Additionally, the ACA amended the intent requirement of certain of these criminal statutes under HIPAA so that a person or entity no longer needs to have actual knowledge of the statute, or the specific intent to violate it, to have committed a violation. The ACA further created new federal requirements for reporting, by applicable manufacturers of covered drugs, payments and other transfers of value to physicians and teaching hospitals, and ownership and investment interests held by physicians and other healthcare providers and their immediate family members.

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        Further, we may be subject to data privacy and security regulation by both the federal government and the states in which we conduct our business. HIPAA, as amended by the Health Information Technology for Economic and Clinical Health Act, or HITECH, and its respective implementing regulations imposes certain requirements relating to the privacy, security, and transmission of individually identifiable health information. Among other things, HITECH, through its implementing regulations, makes HIPAA's security standards and certain privacy standards directly applicable to business associates, defined as a person or organization, other than a member of a covered entity's workforce, that creates, receives, maintains, or transmits protected health information on behalf of a covered entity for a function or activity regulated by HIPAA. HITECH also increased the civil and criminal penalties that may be imposed against covered entities, business associates, and possibly other persons, and gave state attorneys general new authority to file civil actions for damages or injunctions in federal courts to enforce the federal HIPAA laws and seek attorneys' fees and costs associated with pursuing federal civil actions. In addition, other federal and state laws may govern the privacy and security of health and other information in certain circumstances, many of which differ from each other in significant ways and may not have the same effect, thus complicating compliance efforts.

        Many states have also adopted laws similar to each of the above federal laws, which may be broader in scope and apply to items or services reimbursed by any third-party payor, including commercial insurers. Certain state laws also regulate manufacturers' use of prescriber-identifiable data. Certain states also require implementation of commercial compliance programs and compliance with the pharmaceutical industry's voluntary compliance guidelines and the applicable compliance guidance promulgated by the federal government, or otherwise restrict payments or the provision of other items of value that may be made to healthcare providers and other potential referral sources; impose restrictions on marketing practices; or require drug manufacturers to track and report information related to payments, gifts, and other items of value to physicians and other healthcare providers. These laws may affect our future sales, marketing, and other promotional activities by imposing administrative and compliance burdens.

        If our operations are found to be in violation of any of the laws or regulations described above or any other laws that apply to us, we may be subject penalties or other enforcement actions, including criminal and significant civil monetary penalties, damages, fines, disgorgement, imprisonment, exclusion from participation in government healthcare programs, corporate integrity agreements, debarment from receiving government contracts or refusal of new orders under existing contracts, reputational harm, diminished profits and future earnings, and the curtailment or restructuring of our operations, any of which could adversely affect our ability to operate our business and our results of operations. Enforcement actions can be brought by federal or state governments, or as "qui tam" actions brought by individual whistleblowers in the name of the government under the civil False Claims Act if the violations are alleged to have caused the government to pay a false or fraudulent claim.

        To the extent that any of our products are sold in a foreign country, we may be subject to similar foreign laws and regulations, which may include, for instance, applicable post-marketing requirements, including safety surveillance, anti-fraud and abuse laws, and implementation of corporate compliance programs and reporting of payments or transfers of value to healthcare professionals.

Coverage and Reimbursement Generally

        The commercial success of our product candidates and our ability to commercialize any approved product candidates successfully will depend in part on the extent to which governmental payor programs at the federal and state levels, including Medicare and Medicaid, private health insurers, and other third-party payors provide coverage for and establish adequate reimbursement levels for our product candidates. Government authorities, private health insurers, and other organizations generally decide which drugs they will pay for and establish reimbursement levels for healthcare. Medicare is a federally funded program managed by the Centers for Medicare and Medicaid Services, or CMS,

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through local fiscal intermediaries and carriers that administer coverage and reimbursement for certain healthcare items and services furnished to the elderly and disabled. Medicaid is an insurance program for certain categories of patients whose income and assets fall below state defined levels and who are otherwise uninsured that is both federally and state funded and managed by each state. The federal government sets general guidelines for Medicaid and each state creates specific regulations that govern its individual program, including supplemental rebate programs that restrict coverage to drugs on the state Preferred Drug List. Similarly, government laws and regulations establish the parameters for coverage of prescription drugs by Tricare, the health care program for military personnel, retirees, and related beneficiaries. Many states have also created pharmacy assistance programs for individuals who do not qualify for federal programs. In the United States, private health insurers and other third-party payors often provide reimbursement for products and services based on the level at which the government provides reimbursement through the Medicare or Medicaid programs for such products and services.

        In the United States, the European Union, and other potentially significant markets for our product candidates, government authorities and third-party payors are increasingly attempting to limit or regulate the price of medical products and services, particularly for new and innovative products and therapies, which often has resulted in average selling prices lower than they would otherwise be. For example, in the United States, federal and state governments reimburse covered prescription drugs at varying rates generally below average wholesale price. These restrictions and limitations influence the purchase of healthcare services and products. Third-party payors are developing increasingly sophisticated methods of controlling healthcare costs. Third-party payors may limit coverage to specific drug products on an approved list, or formulary, which might not include all of the FDA-approved drug products for a particular indication. Third-party payors also control costs by requiring prior authorization or imposing other dispensing restrictions before covering certain products and by broadening therapeutic classes to increase competition. Third-party payors are increasingly challenging the price and examining the medical necessity and cost-effectiveness of medical products and services, in addition to their safety and efficacy. Absent clinical differentiators, third-party payors may treat products as therapeutically equivalent and base formulary decisions on net cost. To lower the prescription cost, manufacturers frequently rebate a portion of the prescription price to the third-party payors.

        Federal programs also impose price controls through mandatory ceiling prices on purchases by federal agencies and federally funded hospitals and clinics and mandatory rebates on retail pharmacy prescriptions paid by Medicaid and Tricare. These restrictions and limitations influence the purchase of healthcare services and products. Legislative proposals to reform healthcare or reduce costs under government programs may result in lower reimbursement for our product candidates or exclusion of our product candidates from coverage. In addition, government programs like Medicaid include substantial penalties for increasing commercial prices over the rate of inflation which can affect realization and return on investment.

        Private payors often rely on the lead of the governmental payors in rendering coverage and reimbursement determinations. Therefore, achieving favorable CMS coverage and reimbursement is usually a significant gating issue for successful introduction of a new product. In addition, many government programs as a condition of participation mandate fixed discounts or rebates from manufacturers regardless of formulary position or utilization, and then rely on competition in the market to attain further price reductions, which can greatly reduce realization on the sale.

        Further, the increased emphasis on managed healthcare in the United States and on country and regional pricing and reimbursement controls in the European Union will put additional pressure on product pricing, reimbursement, and utilization, which may adversely affect our future product sales and results of operations. These pressures can arise from rules and practices of managed care groups, competition within therapeutic classes, availability of generic equivalents, judicial decisions and

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governmental laws and regulations related to Medicare, Medicaid, and healthcare reform, pharmaceutical coverage and reimbursement policies, and pricing in general. Patients who are prescribed treatments for their conditions and providers performing the prescribed services generally rely on third-party payors to reimburse all or part of the associated healthcare costs. Sales of our product candidates will therefore depend substantially, both domestically and abroad, on the extent to which the costs of our products will be paid by health maintenance, managed care, pharmacy benefit and similar healthcare management organizations, or reimbursed by government health administration authorities, such as Medicare and Medicaid, private health insurers, and other third-party payors.

        As a result of the above, we may need to conduct expensive pharmacoeconomic studies in order to demonstrate the medical necessity and cost-effectiveness of our products, in addition to the costs required to obtain the FDA approvals. Our product candidates may not be considered medically necessary or cost-effective, or the rebate percentages required to secure coverage may not yield an adequate margin over cost.

        Moreover, a payor's decision to provide coverage for a drug product does not imply that an adequate reimbursement rate will be approved. Adequate third-party reimbursement may not be available to enable us to maintain price levels sufficient to realize an appropriate return on our investment in drug development. Legislative proposals to reform healthcare or reduce costs under government insurance programs may result in lower reimbursement for our products and product candidates or exclusion of our products and product candidates from coverage. The cost containment measures that healthcare payors and providers are instituting and any healthcare reform could significantly reduce our revenues from the sale of any approved product candidates. We cannot provide any assurances that we will be able to obtain and maintain third-party coverage or adequate reimbursement for our product candidates in whole or in part.

Healthcare Reform Measures

        The United States and some foreign jurisdictions are considering or have enacted a number of legislative and regulatory proposals designed to change the healthcare system in ways that could affect our ability to sell our products profitably. Among policy makers and payors in the United States and elsewhere, there is significant interest in promoting changes in healthcare systems with the stated goals of containing healthcare costs, improving quality, and expanding access. In the United States, the pharmaceutical industry has been a particular focus of these efforts and has been significantly affected by major legislative initiatives.

        For example, the Medicare Prescription Drug, Improvement, and Modernization Act of 2003, or MMA, imposed new requirements for the distribution and pricing of prescription drugs for Medicare beneficiaries. Under Part D, Medicare beneficiaries may enroll in prescription drug plans offered by private entities that provide coverage of outpatient prescription drugs. Part D plans include both standalone prescription drug benefit plans and prescription drug coverage as a supplement to Medicare Advantage plans. Unlike Medicare Part A and B, which do not utilize formularies to restrict coverage, Part D coverage varies by plan. With some exceptions, Part D prescription drug plan sponsors are not required to pay for all covered Part D drugs, and each drug plan can develop its own drug formulary that identifies which drugs it will cover and at what tier or level. However, Part D prescription drug formularies must include drugs within each therapeutic category and class of covered Part D drugs, though not necessarily all the drugs in each category or class. Any formulary used by a Part D prescription drug plan must be developed and reviewed by a pharmacy and therapeutic committee. Government payment for some of the costs of prescription drugs may increase demand for any products for which we receive marketing approval. However, cost reduction initiatives and other provisions of the legislation, as well as any negotiated price discounts for our future products covered by a Part D prescription drug plan, may decrease the coverage and reimbursement rate that we receive, lower the net price realized on our sales to pharmacies, or both. Moreover, while the MMA applies

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only to drug benefits for Medicare beneficiaries, private payors often follow Medicare coverage policy and payment limitations in setting their own payment rates. Any reduction in payment that results from Medicare Part D may result in a similar reduction in payments from non-governmental payors.

        The American Recovery and Reinvestment Act of 2009 provides funding for the federal government to compare the effectiveness of different treatments for the same illness. A plan for the research will be developed by the Department of Health and Human Services, the Agency for Healthcare Research and Quality, and the National Institutes for Health, and periodic reports on the status of the research and related expenditures will be made to Congress. Although the results of the comparative effectiveness studies are not intended to mandate coverage policies for public or private payors, it is not clear what effect, if any, the research will have on the sales of any product, if any such product or the condition that it is intended to treat is the subject of a study. It is also possible that comparative effectiveness research demonstrating benefits in a competitor's product could adversely affect the sales of our product candidates. If third-party payors do not consider our product candidates to be cost-effective compared to other available therapies, they may not cover our product candidates, once approved, as a benefit under their plans or, if they do, the level of payment may not be sufficient to allow us to sell our products on a profitable basis.

        Moreover, as enacted, the ACA is a sweeping law intended to broaden access to health insurance, reduce or constrain the growth of healthcare spending, enhance remedies against fraud and abuse, add new transparency requirements for healthcare and health insurance industries, impose new taxes and fees on the health care industry, and impose additional health policy reforms. The law expanded the eligibility criteria for Medicaid programs, thereby potentially increasing both the volume of sales and manufacturers' Medicaid rebate liability, and expanded the entities eligible for discounts under the Public Health Service pharmaceutical pricing program. The law also expanded the 340B drug discount program that mandates discounts to certain hospitals, community centers, and other qualifying providers, although, with the exception of children's hospitals, these newly eligible entities will not be eligible to receive discounted 340B pricing on orphan drugs. The ACA revised the definition of "average manufacturer price," or AMP, for reporting purposes, which generally increased the amount of Medicaid drug rebates to states and created a separate AMP for certain categories of drugs provided in non-retail outpatient settings. The law additionally extended manufacturer's Medicaid rebate liability to covered drugs dispensed to patients enrolled in Medicaid managed care organizations, increased the statutory minimum rebates a manufacturer must pay under the Medicaid Drug Rebate program, and created an alternative rebate formula for certain new formulations of certain existing products, which is intended to increase the amount of rebates due on those drugs. The revisions to the AMP definition and Medicaid rebate formula could have the further effect of increasing the required 340B discounts. Further, the ACA requires manufacturers of NDA drugs, including 505(b)(2) drugs, to pay 50% of the pharmacy charge to Medicare patients while they are in the coverage gap. Finally, the ACA imposes a significant annual fee on companies that manufacture or import branded prescription drug products. Substantial new provisions affecting compliance have also been enacted through the ACA and otherwise, including the reporting of drug sample distribution, which may require us to modify our business practices with healthcare practitioners. Although we will not know the full effects of the ACA until applicable federal and state agencies issue regulations or guidance under the law, it is likely that pressure on pharmaceutical pricing, especially under the Medicare program, will continue, and may also increase our regulatory burdens and operating costs. Moreover, in the coming years, additional changes could be made to governmental healthcare programs that could significantly impact the success of our product candidates.

        The cost of pharmaceuticals continues to generate substantial governmental and third-party payor interest. We expect that the pharmaceutical industry will experience pricing pressures due to the trend toward managed healthcare, the increasing influence of managed care organizations and additional

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legislative proposals. Our results of operations could be adversely affected by current and future healthcare reforms.

        Some third-party payors also require pre-approval of coverage for new or innovative devices or drug therapies before they will reimburse healthcare providers that use such therapies. While we cannot predict whether any proposed cost-containment measures will be adopted or otherwise implemented in the future, the announcement or adoption of these proposals could have a material adverse effect on our ability to obtain adequate prices for our product candidates and operate profitably.

        In addition, other legislative changes have been proposed and adopted since the ACA was enacted. In August 2011, President Obama signed into law the Budget Control Act of 2011, as amended, which, among other things, created the Joint Select Committee on Deficit Reduction to recommend proposals in spending reductions to Congress. The Joint Select Committee on Deficit Reduction did not achieve its targeted deficit reduction of at least $1.2 trillion for the years 2013 through 2021, triggering the legislation's automatic reductions to several government programs. These reductions include aggregate reductions to Medicare payments to providers of up to 2% per fiscal year, which went into effect in April 2013 and will remain in effect through 2024 unless additional Congressional action is taken. Under the Budget Control Act of 2011, as amended, federal budget "sequestration" Medicare payment reductions became effective on April 1, 2013 and automatically reduced payments under various government programs, including, for example, certain Medicare provider and supplier reimbursement payments. In January 2013, President Obama signed into law the American Taxpayer Relief Act of 2012, which, among other things, further reduced Medicare payments to several categories of healthcare providers and increased the statute of limitations period for the government to recover overpayments to providers from three to five years. These and other healthcare reform initiatives may result in additional reductions in Medicare and other healthcare funding, which could have a material adverse effect on our financial operations. We expect that additional state and federal healthcare reform measures will be adopted in the future, any of which could limit the amounts that federal and state governments will pay for healthcare products and services, which could further limit the prices we are able to charge, or the amounts of reimbursement available, for our product candidates once they are approved.

The Foreign Corrupt Practices Act

        The Foreign Corrupt Practices Act, or FCPA, prohibits any U.S. individual or business from paying, offering, or authorizing payment or offering of anything of value, directly or indirectly, to any foreign official, political party, or candidate for the purpose of influencing any act or decision of the foreign entity in order to assist the individual or business in obtaining or retaining business. The FCPA also obligates companies whose securities are listed in the United States to comply with accounting provisions requiring the company to maintain books and records that accurately and fairly reflect all transactions of the corporation, including international subsidiaries, and to devise and maintain an adequate system of internal accounting controls for international operations. Activities that violate the FCPA, even if they occur wholly outside the United States, can result in criminal and civil fines, imprisonment, disgorgement, oversight, and debarment from government contracts.

Foreign Regulation

        To the extent we choose to develop or sell any products outside of the United States, we will be subject to a variety of foreign regulatory requirements of other countries regarding safety and efficacy and governing, among other things, clinical trials, marketing authorization, commercial sales, and distribution of our products. For example, in the European Union, we must obtain authorization of a clinical trial application, or CTA, in each member state in which we intend to conduct a clinical trial. Whether or not we obtain FDA approval for a product, we would need to obtain the necessary approvals by the comparable regulatory authorities of foreign countries before we can commence

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clinical trials or marketing of the product in those countries. The approval process varies from country to country and can involve additional product testing and additional administrative review periods. The time required to obtain approval in other countries might differ from and be longer than that required to obtain FDA approval. The requirements governing the conduct of clinical trials, product licensing, pricing, and reimbursement vary greatly from country to country. Regulatory approval in one country does not ensure regulatory approval in another, but a failure or delay in obtaining regulatory approval in one country may negatively impact the regulatory process in others. As in the United States, post-approval regulatory requirements, such as those regarding product manufacture, marketing, or distribution would apply to any product that is approved outside the United States.

European Union Drug Approval Process

        To obtain a marketing authorization of a drug in the European Union, we may submit marketing authorization applications, or MAAs, either under the so-called centralized, decentralized, mutual recognition, or national authorization procedures.

Centralized procedure

        The centralized procedure provides for the grant of a single marketing authorization following a favorable opinion by the European Medicines Agency, or EMA, that is valid in all European Union member states, as well as Iceland, Liechtenstein, and Norway. The centralized procedure is compulsory for medicines produced by specified biotechnological processes, products designated as orphan medicinal products, and products with a new active substance indicated for the treatment of specified diseases, such as HIV/AIDS, cancer, diabetes, neurodegenerative disorders, or autoimmune diseases and other immune dysfunctions. The centralized procedure is optional for products that represent a significant therapeutic, scientific, or technical innovation, or whose authorization would be in the interest of public health. Under the centralized procedure the maximum timeframe for the evaluation of an MAA by the EMA is 210 days, excluding clock stops, when additional written or oral information is to be provided by the applicant in response to questions asked by the Committee of Medicinal Products for Human Use, or the CHMP. Accelerated assessment might be granted by the CHMP in exceptional cases, when a medicinal product is expected to be of a major public health interest, particularly from the point of view of therapeutic innovation. The timeframe for the evaluation of an MAA under the accelerated assessment procedure is of 150 days, excluding clock stops.

Other authorization procedures

        There are also two other possible routes to authorize medicinal products in several European Union countries, which are available for investigational medicinal products that fall outside the scope of the centralized procedure:

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Decentralized procedure.  Using the decentralized procedure, an applicant may apply in more than one European Union country, although the applicant must nominate one reference European Union Member State, for simultaneous authorization of medicinal products that have not yet been authorized in any European Union country and that do not fall within the mandatory scope of the centralized procedure. Failing agreement, there is a procedure for resolving disagreements between member states and ultimately an arbitration procedure before the CHMP.



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Mutual recognition procedure.  In the mutual recognition procedure, a medicine is first authorized in one European Union Member State, referred to as the reference member state, in accordance with the national procedures of that country. Following this, further marketing authorizations can be sought from other nominated European Union countries, referred to as the concerned member states, in a procedure whereby the countries concerned agree to recognize the validity

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of the original, national marketing authorization. The procedure for disagreements described above similarly applies.

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National procedures.  Purely national procedures continue to be possible but are strictly limited to where the product is to be authorized in one member state only.

        In the European Union, new products authorized for marketing, referred to as reference products, qualify for eight years of data exclusivity and an additional two years of market exclusivity upon marketing authorization. The data exclusivity period prevents generic applicants from relying on the preclinical and clinical trial data contained in the dossier of the reference product when applying for a generic marketing authorization in the European Union during a period of eight years from the date on which the reference product was first authorized in the European Union. The market exclusivity period prevents a successful generic applicant from commercializing its product in the European Union until 10 years have elapsed from the initial authorization of the reference product in the European Union. The 10-year market exclusivity period can be extended to a maximum of eleven years if, during the first eight years of those ten years, the marketing authorization holder obtains an authorization for one or more new therapeutic indications which, during the scientific evaluation prior to their authorization, are held to bring a significant clinical benefit in comparison with existing therapies.

Employees

        As of October 13, 2015, we had 7 full-time employees and 2 key consultants, 3 of whom hold Ph.D. or M.D. degrees. None of our employees is represented by a collective bargaining agreement and we have never experienced any work stoppage. We believe that we maintain good relations with our employees.

Facilities

        Our offices are located in New York, New York. We currently have a month-to-month agreement for office space that automatically renews for successive monthly periods, unless we provide notice of non-renewal. We believe that our current facilities are suitable and adequate to meet our current needs. We intend to add new facilities or expand existing facilities as we add employees, and we believe that suitable additional or substitute space will be available as needed to accommodate any such expansion of our operations.

Legal Proceedings

        We are not currently a party to any legal proceedings. We may become involved in various claims and legal proceedings in the future.

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MANAGEMENT

Executive Officers and Directors

        The following table sets forth certain information regarding our executive officers, key personnel and directors as of October 13, 2015.

Executive Officers

        Herriot Tabuteau, M.D. has served as our founder, Chief Executive Officer, and Chairman of our board of directors since our founding in January 2012. He is also the founder of Antecip Capital LLC (formerly Versant Capital Management LLC), one of our principal stockholders, for which Dr. Tabuteau has been the managing member since 2003. Dr. Tabuteau is also the managing member of Antecip Bioventures II LLC. Prior to founding our company, Dr. Tabuteau was a Senior Analyst and Partner at Healthco/S.A.C. Capital (now known as HealthCor) where he was responsible for the biotechnology, genomics and instrumentation portfolios. Previously, Dr. Tabuteau was the healthcare analyst at Kingdon Capital. Dr. Tabuteau began his professional career as an investment banking analyst at Goldman Sachs and subsequently was a Senior Research Analyst at Banc of America Securities covering the hospital supplies sector. Dr. Tabuteau earned his M.D. from Yale University School of Medicine and his Bachelor of Arts in molecular biology and biochemistry from Wesleyan University. We believe that Dr. Tabuteau's medical background, coupled with his extensive investment experience in the healthcare field, make him uniquely suited to guide the Board in strategic planning, operational, and commercial matters.

        Randall Kaye, M.D. has served as our Chief Medical Officer since April 2015, and previously served as our Vice President, Clinical Affairs since September 2014. Prior to joining us, Dr. Kaye was at Avanir Pharmaceuticals, Inc., a CNS-focused company, from 2006 to 2014, where he served in a variety of roles, including Chief Medical Officer, and Senior Vice President, Clinical Research and Medical Affairs. While at Avanir, Dr. Kaye provided leadership and vision to the clinical, regulatory, and medical affairs areas, and supported the commercialization of new products from a medical, scientific, regulatory, technical, and quality perspective. Immediately prior to joining Avanir, Dr. Kaye was the Vice President of Medical Affairs for Scios Inc., a cardiovascular division of Johnson & Johnson. Prior to joining Johnson & Johnson, Dr. Kaye recruited and managed the medical affairs department for InterMune Inc., a specialty company focusing on Idiopathic Pulmonary Fibrosis. Previously, Dr. Kaye served for nearly a decade in a variety of medical affairs and medical marketing positions for Pfizer Inc. Dr. Kaye earned his Doctor of Medicine, Masters in Public Health, and Bachelor of Science

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degrees at George Washington University in Washington, D.C. Dr. Kaye trained in Pediatrics at the University of Massachusetts Medical School and was a Research Fellow in Allergy and Immunology at Harvard Medical School.

        Constance Ames has served as our Vice President, Finance since February 2015. Ms. Ames joined us from Keryx Biopharmaceuticals, Inc., which she joined in 2010, where she served most recently as Senior Director, Finance and Accounting. During her tenure there, Ms. Ames played a critical role in growing the finance and accounting department through Keryx's transition from a development-stage company to a fully integrated commercial organization. She was also responsible for leading Keryx's compliance with Securities and Exchange Commission rules and regulations. Prior to joining Keryx, she was with Deloitte and Touche, LLP, independent certified public accountants, where she served as a senior associate. Ms. Ames received a Bachelor of Science in accounting from Ithaca College and is a member of the American Institute of Certified Public Accountants.

Key Personnel

        Robert Niecestro, Ph.D. has served as our Head of Regulatory since October 2012. In addition, since 2004, Dr. Niecestro has served as a consultant to a variety of biopharmaceutical companies, including Keryx Biopharmaceuticals, Inc. and TG Therapeutics, Inc. Prior to 2004, Dr. Niecestro previously held numerous senior management positions including serving as Vice President of Clinical Development for Andrx Laboratories, Senior Director, Clinical Development and Therapeutic Head for Gastrointestinal, Oncology and Stroke at Eisai Inc. and as Director, Clinical Operations and NDA Planning for Organon Inc. While at Andrx, Dr. Niecestro was part of the team that developed the following approved drugs: extended-release metformin, extended-release lovastatin and valproic acid. At Eisai, Dr. Niecestro played a pivotal role in the development and commercialization of Aciphex (rabeprazole sodium), the post-NDA program for Aricept (donepezil sodium), and started both the oncology and neurology franchises in the United States; and while at Organon was part of the team that developed and commercialized the following drugs: Zemuron (rocuronium bromide), Orgaran (danaparoid sodium), Humegon (FSH/LH), Follistim (recombinant FSH beta), and one birth control pill (Mircette). Dr. Niecestro has been involved in the filing of over 45 INDs, has over 60 peer-reviewed publications and holds 3 patents. Dr. Niecestro completed his graduate and post-graduate work at the University of Illinois at Chicago.

        Mark Jacobson, M.A. has served as our Senior Director of Operations since April 2014. Prior to joining Axsome, he was Director of Corporate Development at Stemline Therapeutics, Inc., where he played a critical role in advancing the company from a 3-person team in 2010 to the successful completion of an initial public offering and secondary public offering in 2013, which together raised approximately $100 million for the company. While at Stemline, Mr. Jacobson's responsibilities spanned investor relations, public relations, corporate operations, and intellectual property. Mr. Jacobson began his career in healthcare communications at Publicis Healthcare Communications Group. Mr. Jacobson earned a Master of Arts in Biotechnology from Columbia University and a Bachelor of Science in Biology from Iowa State University.

Non-Employee Directors

        Roger Jeffs, Ph.D. has been a member of our board of directors since December 2014. Dr. Jeffs is currently the President and Co-Chief Executive Officer of United Therapeutics Corporation, a leading biotechnology company. Dr. Jeffs oversees the company's global clinical, commercial, manufacturing, regulatory, pharmacovigilance, and business development efforts. He joined United Therapeutics as Director of Research, Development and Medical in 1998. Prior to joining United Therapeutics, Dr. Jeffs served as the worldwide clinical leader of the Infectious Disease Program at Amgen, Inc. Prior to Amgen, he was a member of the Flolan clinical research team at Burroughs Wellcome & Company. Dr. Jeffs holds a Ph.D. from the University of North Carolina and received his

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undergraduate degree from Duke University. Dr. Jeffs' scientific background and business experience, coupled with his experience as a chief executive officer of a publicly traded biotechnology company, provides him with the qualifications and skills to serve as a director.

        Mark Coleman, M.D. has been a member of our board of directors since December 2014. In addition, from 2012 to 2014, Dr. Coleman served as a consultant to us. Dr. Coleman has served as the Medical Director of the Baltimore branch of National Spine and Pain Centers, or NSPC, the nation's largest interventional pain management group, from 2005. Dr. Coleman served as Director of Novel Therapies at NSPC from 2009 to 2011. NSPC routinely evaluates emerging treatments for pain through the conduct of clinical trials. Dr. Coleman is a Diplomat of the American Board of Anesthesiology in Anesthesiology and Pain Management. Dr. Coleman holds an M.D. from Johns Hopkins University School of Medicine and received his undergraduate degree from Wesleyan University. Dr. Coleman's medical background, particularly his specialized experience in the treatment of pain, make him qualified to serve on our board.

        Mark Saad has been a member of our board of directors since December 2014. Since August 2014, Mr. Saad has served as the Chief Financial Officer of RuiYi, Inc., a global therapeutic innovator which is advancing a pipeline of first in class monoclonal antibodies to validated G protein-coupled receptors (GPCRs). He previously served as Chief Financial Officer of Cytori Therapeutics from 2004 to 2014, where he was responsible for finance and accounting, business development, and other operating functions. Prior to Cytori, he served as Executive Director of UBS Investment Bank, where he was the Chief Operating Officer of the Global Healthcare Group. Prior to UBS, Mr. Saad was part of the Health Care Investment Banking Group at Salomon Smith Barney. Mr. Saad holds a Bachelor of Arts from Villanova University. Through his years of experience as a chief financial officer, and his experience in the investment banking field, Mr. Saad provides valuable financial and leadership experience to the board.

Composition of our Board of Directors

        Our board of directors currently consists of four members, each of whom are elected pursuant to the board composition provisions of our certificate of incorporation and our stockholders agreement, which agreement is described under "Certain Relationships and Related Party Transactions" in this prospectus. The stockholders agreement, and the board composition provisions contained therein, will terminate upon the closing of this offering. Upon the termination of these provisions, there will be no further contractual obligations regarding the election of our directors. Our nominating and corporate governance committee and board of directors may therefore consider a broad range of factors relating to the qualifications and background of nominees, which may include diversity, which is not only limited to race, gender, or national origin. We have no formal policy regarding board diversity. Our nominating and corporate governance committee's and board of directors' priority in selecting board members is identification of persons who will further the interests of our stockholders through his or her established record of professional accomplishment, the ability to contribute positively to the collaborative culture among board members, and professional and personal experiences and expertise relevant to our growth strategy.

        Immediately prior to the closing of this offering, our board of directors will be divided into three staggered classes of directors of the same or nearly the same number and each will be assigned to one of the three classes. At each annual meeting of the stockholders, a class of directors will be elected for a three-year term to succeed the directors of the same class whose terms are then expiring. The terms of the directors will expire upon the election and qualification of successor directors at the annual meeting of stockholders to be held during the years 2016 for Class I directors, 2017 for Class II directors, and 2018 for Class III directors.

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Our Class I director will be Roger Jeffs, Ph.D.;

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Our Class II director will be Mark Saad; and



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Our Class III directors will be Herriot Tabuteau, M.D. and Mark Coleman, M.D.

        Our amended and restated certificate of incorporation and amended and restated bylaws, as will be in effect upon completion of this offering, provide that the number of our directors shall be fixed from time to time by a resolution of the majority of our board of directors. Any additional directorships resulting from an increase in the number of directors will be distributed among the three classes so that, as nearly as possible, each class shall consist of one third of the board of directors.

        The division of our board of directors into three classes with staggered three-year terms may delay or prevent stockholder efforts to effect a change of our management or a change in control.

Board Leadership Structure

        The positions of Chief Executive Officer and Chairman of the Board are both currently held by Dr. Tabuteau. Our board of directors has also appointed a Lead Director, Dr. Jeffs. The Lead Director's responsibilities include: (1) coordinating the scheduling and preparation of agendas for the executive sessions of the board and other meetings of the board in the absence of the Chairman of the Board; (2) chairing executive sessions of the board and other meetings of the board in the absence of the Chairman of the Board; (3) approving information sent to the board; (4) serving as a liaison between the Chairman of the Board and the other independent directors; (5) approving the meeting agendas for the board and approving the meeting schedules of the board to assure that there is sufficient time for discussion of all agenda items; and (6) if requested by major stockholders, ensuring that he or she will be available for consultation and direct communication with such major stockholders. The Lead Director has the authority to call meetings of the independent directors. The board believes that this combined role of Chairman and Chief Executive Officer, coupled with a Lead Director, is currently the most effective leadership structure for the company and is in the best interests of its stockholders. In considering its leadership structure, the board believes that the combined roles of Chairman and Chief Executive Officer are appropriately balanced by the designation of a Lead Director with substantive responsibilities, the majority of independent directors that comprise the board and the company's strong corporate governance policies and procedures.

        We have a separate chair for each committee of our board of directors. The chairs of each committee are expected to report annually to our board of directors on the activities of their committee in fulfilling their responsibilities as detailed in their respective charters or specify shortcomings, if any.

Board's Role in Risk Oversight

        Our board of directors oversees the management of risks inherent in the operation of our business and the implementation of our business strategies. Our board of directors performs this oversight role by using several different levels of review. In connection with its reviews of the operations and corporate functions of the company, our board of directors addresses the principal risks associated with those operations and corporate functions. In addition, our board of directors reviews the risks associated with our business strategies periodically throughout the year as part of its consideration of undertaking any such business strategies.

Director Independence

        Under the listing requirements and rules of the NASDAQ             Market, or NASDAQ, independent directors must compose a majority of a listed company's board of directors within a one year period following the completion of this offering. In addition, applicable NASDAQ rules require that, subject to specified exceptions, each member of a listed company's audit, compensation, and nominating and corporate governance committees must be independent within the meaning of

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applicable NASDAQ rules. Audit committee members must also satisfy the independence criteria set forth in Rule 10A-3 under the Securities Exchange Act of 1934, as amended, or the Exchange Act.

        In September 2015, our board of directors undertook a review of the independence of each director and considered whether any director has a material relationship with us that could compromise his or her ability to exercise independent judgment in carrying out his or her responsibilities. In making this determination, our board of directors considered the current and prior relationships that each non-employee director has with our company and all other facts and circumstances our board of directors deemed relevant in determining their independence, including the beneficial ownership of our capital stock by each non-employee director and the association of our directors with the holders of more than 5% of our common stock. As a result of this review, our board of directors determined that Dr. Coleman, Dr. Jeffs, and Mr. Saad qualify as "independent" directors within the meaning of the NASDAQ rules. NASDAQ rules require that a majority of the board of directors and each member of our audit, compensation and nominating and corporate governance committees be independent. We believe we are compliant with these independence requirements. As required under applicable NASDAQ rules, we anticipate that our independent directors will meet in regularly scheduled executive sessions at which only independent directors are present. There are no family relationships among any of our directors or executive officers.

Committees of our Board of Directors

        Our board of directors has established an audit committee, a compensation committee and a nominating and corporate governance committee, each of which operates pursuant to a charter adopted by our board of directors. Upon the closing of this offering, the composition and functioning of all of our committees will comply with all applicable requirements of the Sarbanes-Oxley Act of 2002, the NASDAQ listing standards and the SEC rules and regulations.

        Audit committee.    The members of our audit committee are Dr. Coleman, Dr. Jeffs and Mr. Saad. Mr. Saad serves as the chair. Our board of directors has determined that each of the members of our audit committee satisfies NASDAQ and SEC independence requirements, and that Mr. Saad qualifies as an audit committee financial expert within the meaning of SEC regulations and meets the financial sophistication requirements of the NASDAQ listing standards. In making this determination, our board has considered the formal education and nature and scope of his previous experience.

        The audit committee's responsibilities include, among other things:

•

appointing, approving the compensation of, and assessing the independence of our independent registered public accounting firm;



•

pre-approving auditing and permissible non-audit services, and the terms of such services, to be provided by our independent registered public accounting firm;



•

reviewing the overall audit plan with the independent registered public accounting firm and members of management responsible for preparing our financial statements;



•

reviewing and discussing with management and the independent registered public accounting firm our annual and quarterly financial statements and related disclosures as well as critical accounting policies and practices used by us;



•

coordinating the oversight and reviewing the adequacy of our internal control over financial reporting;



•

establishing policies and procedures for the receipt and retention of accounting-related complaints and concerns;



•

resolving any disagreements between management and the auditors regarding financial reporting;

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•

monitoring the integrity of our financial statements and our compliance with legal and regulatory requirements as they relate to our financial statements and accounting matters;



•

preparing the audit committee report required by SEC rules to be included in our annual proxy statement;



•

reviewing all related person transactions for potential conflict of interest situations and approving all such transactions; and



•

reviewing quarterly earnings releases.

        Compensation committee.    The members of our compensation committee are Dr. Jeffs and Mr. Saad. Mr. Saad serves as the chair. Our board of directors has determined that each of the members of our compensation committee satisfies NASDAQ and SEC independence requirements.

        The compensation committee's responsibilities include, among other things:

•

annually reviewing and making recommendations to the board of directors with respect to corporate goals and objectives relevant to the compensation of our Chief Executive Officer;



•

evaluating the performance of our Chief Executive Officer in light of such corporate goals and objectives and making recommendations to the board of directors with respect to the compensation of our Chief Executive Officer;



•

reviewing and approving the compensation of our other executive officers;



•

reviewing and establishing our overall management compensation, philosophy and policy;



•

overseeing and administering our compensation and similar plans;



•

reviewing and approving our policies and procedures for the grant of equity-based awards;



•

reviewing and making recommendations to the board of directors with respect to director compensation;



•

reviewing and discussing with management the compensation discussion and analysis to be included in our annual proxy statement or Annual Report on Form 10-K; and



•

reviewing and discussing with the board of directors corporate succession plans for the Chief Executive Officer and other key officers.

        Nominating and corporate governance committee.    The members of our nominating and corporate governance committee are Dr. Coleman, Dr. Jeffs, and Mr. Saad. Dr. Jeffs serves as the chair. Our board of directors has determined that each of the members of the nominating and corporate governance committee are independent as independence is currently defined in applicable NASDAQ listing standards.

        The nominating and corporate governance committee's responsibilities include:

•

developing and recommending to the board of directors criteria for board and committee membership;



•

establishing procedures for identifying and evaluating board of director candidates, including nominees recommended by stockholders;



•

reviewing the size and composition of the board of directors to ensure that it is composed of members containing the appropriate skills and expertise to advise us;



•

identifying individuals qualified to become members of the board of directors;

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•

recommending to the board of directors the persons to be nominated for election as directors and to each of the board's committees;



•

developing and recommending to the board of directors a code of business conduct and ethics and a set of corporate governance guidelines;



•

developing a mechanism by which violations of the code of business conduct and ethics can be reported in a confidential manner; and



•

overseeing the evaluation of the board of directors and management.

        Our board of directors may from time to time establish other committees.

Compensation Committee Interlocks and Insider Participation

        None of the members of our compensation committee has at any time during the prior three years been one of our officers or employees. None of our executive officers currently serves, or in the past fiscal year has served, as a member of the board of directors or compensation committee of any entity that has one or more executive officers serving on our board of directors or compensation committee.

Code of Business Conduct and Ethics

        We have adopted a code of business conduct and ethics that applies to all of our employees, officers, and directors, including those officers responsible for financial reporting. Upon the closing of this offering, our code of business conduct and ethics will be available on our website at www.axsome.com. We intend to disclose any amendments to the code, or any waivers of its requirements, on our website.

Limitation of Liability and Indemnification Arrangements

        As permitted by the Delaware General Corporation Law, we have adopted provisions in our amended and restated certificate of incorporation and amended and restated bylaws, as will be in effect upon the completion of this offering, that limit or eliminate the personal liability of our directors. Consequently, a director will not be personally liable to us or our stockholders for monetary damages for breach of fiduciary duty as a director, except for liability for:

•

any breach of the director's duty of loyalty to us or our stockholders;



•

any act or omission not in good faith or that involves intentional misconduct or a knowing violation of law;



•

any unlawful payments related to dividends or unlawful stock repurchases, redemptions or other distributions; or



•

any transaction from which the director derived an improper personal benefit.

        These limitations of liability do not alter director liability under the federal securities laws and do not affect the availability of equitable remedies such as an injunction or rescission.

        In addition, our amended and restated bylaws, as will be in effect upon completion of this offering, provide that:

•

we will indemnify our directors, officers, and, in the discretion of our board of directors, certain employees to the fullest extent permitted by the Delaware General Corporation Law; and



•

advance expenses, including attorneys' fees, to our directors and, in the discretion of our board of directors, to our officers and certain employees, in connection with legal proceedings, subject to limited exceptions.

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        Prior to the completion of this offering, we also expect to enter into indemnification agreements with each of our executive officers and directors. These agreements will provide that we will indemnify each of our directors to the fullest extent permitted by the Delaware General Corporation Law and advance expenses to each indemnitee in connection with any proceeding in which indemnification is available.

        We also maintain general liability insurance to provide insurance coverage to our directors and officers for losses arising out of claims based on acts or omissions in their capacities as directors or officers, including liabilities under the Securities Act of 1933, as amended, or the Securities Act. Insofar as indemnification for liabilities arising under the Securities Act may be permitted to directors, officers, or persons controlling the registrant pursuant to the foregoing provisions, we have been informed that in the opinion of the Securities and Exchange Commission such indemnification is against public policy as expressed in the Securities Act and is therefore unenforceable.

        These provisions may discourage stockholders from bringing a lawsuit against our directors in the future for any breach of their fiduciary duty. These provisions may also have the effect of reducing the likelihood of derivative litigation against directors and officers, even though such an action, if successful, might otherwise benefit us and our stockholders. Furthermore, a stockholder's investment may be adversely affected to the extent we pay the costs of settlement and damage awards against directors, officers and certain employees pursuant to these indemnification provisions. We believe that these provisions, the indemnification agreements and the insurance are necessary to attract and retain talented and experienced directors and officers.

        At present, there is no pending litigation or proceeding involving any of our directors, officers, or employees in which indemnification will be required or permitted. We are not aware of any threatened litigation or proceeding that might result in a claim for such indemnification.

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EXECUTIVE AND DIRECTOR COMPENSATION

Summary Compensation Table

        The following table sets forth the compensation earned by our Chief Executive Officer, our sole executive officer during the fiscal year ended December 31, 2014. We refer to the foregoing as our named executive officer.

        We have not entered into an employment agreement with Dr. Tabuteau. Prior to December 2014, Dr. Tabuteau, as the sole member of our board of directors, approved his own compensation for his service as our Chief Executive Officer, after taking into consideration our financial resources and projected financial needs. Effective upon the closing of this offering, our compensation committee will approve the compensation and benefits of our executive officers.

Outstanding Equity Awards at Fiscal Year-End

        No equity awards have been granted to Dr. Tabuteau as of December 31, 2014.

Director Compensation

        During our fiscal year ended December 31, 2014, we granted options to purchase shares of our common stock under our 2013 Equity Compensation Plan to our non-employee directors. We did not pay any cash compensation to our non-employee directors for their service as board members. A non-employee director is a director who is not employed by us and who does not receive compensation from us (other than for services as a director) or have a business relationship with us that would require disclosure under certain SEC rules. Dr. Tabuteau, our Chief Executive Officer and a member of our board of directors, did not receive any compensation from us during our fiscal year ended December 31, 2014, for his service as a director and is not included in the table below.

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(1)

In accordance with SEC rules, this column reflects the aggregate grant date fair value of the option awards granted computed in accordance with Financial Accounting Standard Board Accounting Codification Topic 718 for stock-based compensation transactions (ASC 718). Assumptions used in the calculation of these amounts are included in Note 9 to our consolidated financial statements. These amounts do not reflect the actual economic value that will be realized by the director upon the vesting of the stock options, the exercise of the stock options, or the sale of the common stock underlying such stock options.

(2)

As of December 31, 2014, each of Dr. Jeffs and Mr. Saad held outstanding options to purchase 1,500 shares of our common stock.

(3)

As of December 31, 2014, Dr. Coleman held outstanding options to purchase 14,830 shares of our common stock, of which options to purchase 13,330 shares of our common stock were granted pursuant to a consulting agreement between us and Dr. Coleman for services rendered to us separate from his service to us as a board member. See "Certain Relationships and Related Party Transactions—Related Party Transactions—Consulting Agreement with Mark Coleman, M.D."

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        In September 2014, our board of directors approved the following non-employee director compensation.

Director Annual Retainer and Meeting Fees

        Effective immediately prior to the completion of our IPO, each non-employee director shall receive an annual cash retainer of $25,000. In addition, the non-employee director serving as the Chair of the Audit Committee shall receive an additional annual cash retainer of $5,000. All retainers are prorated for any portion of a year to which they apply for each non-employee director.

Equity Awards

        In September 2014, each non-employee director serving on the board of directors was granted the option to purchase 1,500 shares of common stock. The options vest annually in equal installments over three years.

        Contingent and effective immediately prior to the effectiveness of the registration statement of which this prospectus is a part, each non-employee director serving on the board of directors shall be granted $50,000 of nonqualified stock options or restricted stock (with the form to be determined on the date of grant) on an annual basis, with each grant to occur following each year of service to us for each non-employee director. The shares will vest on the one-year anniversary of each grant, subject to the non-employee director's continued board service through each vesting date and provided that the director attends at least 75% of the board of directors meetings held during each respective year of board service.

        It is intended that options under the director compensation policy will be granted under our 2013 Equity Compensation Plan, as described below.

2013 Equity Compensation Plan

        Our board of directors previously adopted our 2013 Equity Compensation Plan as of March 22, 2013, which was approved by stockholders on the same date. Our board of directors subsequently approved a resolution amending the 2013 Plan in June 2015 to increase the number of shares available for issuance under the 2013 Plan. We refer to our 2013 Equity Compensation Plan in this section, as the 2013 Plan. The purpose of the 2013 Plan is to provide for the grant of incentive stock options, nonqualified stock options, stock awards, stock units, stock appreciation rights and other equity-based awards to employees, certain consultants and advisors and non-employee members of the Board of Directors.

        We have reserved an aggregate of 135,000 shares of our common stock for the issuance of options and stock awards under the 2013 Plan. The foregoing number is subject to adjustment in the event of a stock split, stock dividend, or other change in our capitalization. The shares we issue under the 2013 Plan are authorized but unissued shares or shares we reacquire. The shares of common stock underlying any options that are forfeited, canceled, repurchased, expire, or are otherwise terminated (other than by exercise) under the 2013 Plan are currently added back to the shares of common stock available for issuance under the 2013 Plan. Our 2013 Plan does not provide for payment of cash bonus awards.

        The 2013 Plan permits us to grant incentive stock options and non-qualified stock options and allows us to issue shares of common stock to officers, employees, directors, and consultants. Our 2013 Plan is administered by our board of directors. Our board of directors has the authority to select the individuals to whom awards will be granted, to make any combination of awards to participants, to accelerate the exercisability or vesting of any award, and to determine the specific terms and conditions of each award.

        The exercise price of each option will be determined by our board of directors but may not be less than the fair market value of the common stock on the date of grant. The term of each option will be

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fixed by the board of directors and may not exceed ten years from the date of grant. All stock option awards that are granted to employees are subject to the terms and conditions of a stock option agreement. Shares of common stock may be issued under the plan subject to such terms and conditions as may be determined by the board.

        In the event of a change in control of the company, the board of directors may take any of the following actions with respect to any or all outstanding awards under the 2013 Plan: (1) determine that outstanding options and stock appreciation rights shall accelerate and become fully exercisable; (2) determine that the restrictions and conditions on outstanding stock awards, stock units, and other equity-based awards shall lapse in full and shall become payable upon terms determined by the board of directors; (3) require that grantees surrender their outstanding options or stock appreciation rights in exchange for a payment by the company, in cash or stock as determined by the board of directors, in an amount equal to the amount by which the then fair market value of the shares of common stock subject to the grantee's unexercised options exceeds the exercise price of the options; (4) after giving grantees an opportunity to exercise their outstanding options and stock appreciation rights, terminate any or all unexercised options at such time as the board of directors deems appropriate; or (5) provide that the awards will be assumed or otherwise continued in effect in connection with the change in control transaction.

        Under our 2013 Plan, a change of control occurs if: (1) a person, entity, or affiliated group (with certain exceptions) acquires more than 50% of our then-outstanding voting securities; (2) a transaction in which we merge into another entity is consummated unless the holders of our voting shares immediately prior to the merger have at least 50% of the combined voting power of the securities in the merged entity or its parent; (3) we sell or dispose of all or substantially all of our assets; or (4) we are liquidated or dissolved.

        Our board of directors may amend, suspend, or terminate the 2013 Plan at any time, subject to stockholder approval where such approval is required by applicable law. The board of directors may also amend, modify, or terminate any outstanding award, provided that no amendment to an award may materially impair any of the rights of a participant under any awards previously granted without his or her written consent.

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CERTAIN RELATIONSHIPS AND RELATED PARTY TRANSACTIONS

        The following is a description of transactions since our incorporation on January 12, 2012, in which we were a party and the amount involved exceeded or will exceed $120,000, and in which any of our executive officers, directors, or holders of more than 5% of any class of our voting securities, or an affiliate or immediate family member thereof, had or will have a direct or indirect material interest. We believe the terms obtained or consideration that we paid or received, as applicable, in connection with the transactions described below were comparable to terms available or amounts that would be paid or received, as applicable, in arm's-length transactions with unrelated third parties.

Related Party Transactions

March 2013 Convertible Note Financing

        In March 2013, we entered into Note Purchase Agreements pursuant to which we issued and sold to investors an aggregate principal amount of $211,000 of convertible notes (the "March 2013 Notes"). The aggregate principal amount of the March 2013 Notes together with accrued interest thereon was converted to shares of our common stock in March 2014 and none of the March 2013 Notes remain outstanding.

        The participants in this convertible note financing included the following director:

        Dr. Coleman's participation as a purchaser of March 2013 Notes under the Note Purchase Agreement was on the same terms as the other purchasers that are unaffiliated with us.

June—October 2013 Convertible Note Financing

        From June through October 2013, we entered into Note Purchase Agreements pursuant to which we issued and sold to investors an aggregate principal amount of $3,904,000 of convertible notes (the "June 2013 Notes"). The aggregate principal amount of the June 2013 Notes together with accrued interest thereon was converted to shares of our common stock between June 2014 and October 2014 and none of the June 2013 Notes remain outstanding.

        The participants in this convertible note financing included the following director:

        Dr. Coleman's participation as a purchaser of June 2013 Notes under the Note Purchase Agreement was on the same terms as the other purchasers that are unaffiliated with us.

September—November 2014 Convertible Note Financing

        From September through November 2014, we entered into Note Purchase Agreements pursuant to which we issued and sold to investors an aggregate principal amount of $4,140,000 of convertible notes (the "September 2014 Notes"). All of the September 2014 Notes remain outstanding. The September 2014 Notes accrue interest at a rate of 8% per annum and will automatically convert, upon closing of

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this offering, into shares of our common stock at a conversion price equal to $39.67 per share, as adjusted for capitalization changes; provided, however, if the initial public offering price is less than $39.67 per share, then the note conversion price will equal 75% of the initial public offering price.

        The participants in this convertible note financing included the following director:

        Dr. Coleman's participation as a purchaser of September 2014 Notes under the Note Purchase Agreement was on the same terms as the other purchasers that are unaffiliated with us.

December 2014—January 2015 Convertible Note Financing

        From December 2014 through January 2015, we entered into Note Purchase Agreements pursuant to which we issued and sold to investors an aggregate principal amount of $1,570,000 of convertible notes (the "December 2014 Notes"). All of the December 2014 Notes remain outstanding. The December 2014 Notes accrue interest at a rate of 8% per annum and will automatically convert, upon closing of this offering, into shares of our common stock at a conversion price equal to $43.63 per share, as adjusted for capitalization changes; provided, however, if the initial public offering price is less than $43.63 per share, then the note conversion price will equal 75% of the initial public offering price.

        The participants in this convertible note financing included the following director:

        Dr. Coleman's participation as a purchaser of December 2014 Notes under the Note Purchase Agreement was on the same terms as the other purchasers that are unaffiliated with us.

May—July 2015 Convertible Note Financing

        From May 2015 through July 2015, we entered into Note Purchase Agreements pursuant to which we issued and sold to investors an aggregate principal amount of $7,166,469 of convertible notes (the "2015 Notes"). All of the 2015 Notes remain outstanding. The 2015 Notes accrue interest at a rate of 8% per annum and will automatically convert, upon closing of this offering, into shares of our common stock at a conversion price equal to $43.63 per share, as adjusted for capitalization changes; provided, however, if the initial public offering price is less than $43.63 per share, then the note conversion price will equal 75% of the initial public offering price.

        The participants in this convertible note financing included the following director and family member:

        These individuals participated as purchasers of 2015 Notes under the Note Purchase Agreement on the same terms as the other purchasers that are unaffiliated with us.

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Stockholders Agreement

        We are party to a stockholders agreement under which certain holders of our capital stock, including all holders of more than 5% of our capital stock, certain of our directors and executive officers, and entities affiliated with certain of our directors and executive officers, have agreed to, among other things, vote in a certain way on certain matters, including with respect to the election of directors. Upon the closing of this offering, the stockholders agreement will terminate and none of our stockholders will have any special rights regarding the election or designation of members of our board of directors.

License Agreements

        We are party to three exclusive license agreements under which an entity affiliated with our Chief Executive Officer and Chairman of the Board, Herriot Tabuteau, M.D., has licensed to us certain patents and applications invented by Dr. Tabuteau. For a more detailed description of these agreements, please see "Business—Material License Agreements."

Consulting Agreement with Mark Coleman, M.D.

        We entered into a three-year consulting agreement with Mark Coleman, M.D., a member of our board of directors, in April 2012, which was subsequently amended in June 2014, to engage Dr. Coleman to provide certain consulting services in connection with our development of pharmaceutical and other therapeutic product candidates. The consulting agreement provided us with the ability to compensate Dr. Coleman in cash or options. In March 2013, we issued to Dr. Coleman an option grant to purchase 2,859 shares of our common stock with an exercise price of $9.55 per share that vested immediately; in June 2014, we issued to Dr. Coleman an option grant to purchase 10,471 shares of our common stock with an exercise price of $9.55 per share which are subject to certain performance-based vesting restrictions; and in June 2015, we issued to Dr. Coleman an option grant to purchase 4,549 shares of our common stock with an exercise price of $43.63 per share that vested immediately. This agreement terminated pursuant to its terms in July 2015.

Indemnification Agreements

        Prior to the completion of this offering, we expect to enter into indemnification agreements with each of our executive officers and directors. These agreements will provide that we will indemnify each of these individuals to the fullest extent permitted by the Delaware General Corporation Law against liabilities that may arise by reason of their service to us or at our direction, and to advance expenses to each indemnitee in connection with any proceeding in which indemnification is available. Insofar as indemnification for liabilities arising under the Securities Act may be permitted to directors, we have been informed that in the opinion of the SEC such indemnification is against public policy and is therefore unenforceable.

Participation in this Offering

        Certain of our officers and directors may purchase shares of common stock in this offering at the initial public offering price pursuant to the directed share program. These prospective purchasers have the right to purchase these shares, but are under no obligation to purchase any shares in this offering and their interest in purchasing shares in this offering is not a commitment to do so. The underwriters will receive the same discount from shares of our common stock purchased by such officers and directors as they will from other shares of our common stock sold to the public in this offering. The shares sold in the directed share program will be subject to the 180-day lock-up restriction in the lock-up agreements described under "Underwriting."

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Transaction with our Founder

        From our inception, our founder, Herriot Tabuteau, M.D. has been our Chief Executive Officer, Chairman of our board of directors, and the beneficial owner of more than 5% of the outstanding shares of our common stock. In connection with the formation of our company, in January 2012, we issued to Antecip Capital LLC, an entity controlled by Dr. Tabuteau, an aggregate of 1,000,000 shares of our common stock for nominal consideration.

Review and Approval of Related Party Transactions

        Our Audit Committee Charter requires that our Audit Committee review and approve or ratify transactions involving us and any executive officer, director, director nominee, 5% stockholder and certain of their immediate family members, also referred to herein as a related person. The policy and procedures cover any transaction involving a related person, also referred to herein as a related person transaction, in which the related person has a material interest and which does not fall under an explicitly stated exception set forth in the applicable disclosure rules of the SEC.

        A related person transaction will be considered approved or ratified if it is authorized by the Audit Committee after full disclosure of the related person's interest in the transaction. In considering related person transactions, the Audit Committee will consider any information considered material to investors and the following factors:

•

the related person's interest in the transaction;



•

the approximate dollar value of the transaction;



•

whether the transaction was undertaken in the ordinary course of our business;



•

whether the terms of the transaction are no less favorable to us than terms that we could have reached with an unrelated third party; and



•

the purpose and potential benefit to us of the transaction.

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PRINCIPAL STOCKHOLDERS

        The following table sets forth information regarding the beneficial ownership of our common stock as of October 13, 2015, and on an as adjusted basis to reflect the sale of the common stock offered in this offering by:

•

all persons known by us to beneficially own more than 5% of our common stock;



•

each of our directors;



•

each of our named executive officers; and



•

all of our directors and executive officers as a group.

        The number of shares beneficially owned by each stockholder is determined under rules issued by the Securities and Exchange Commission and includes voting or investment power with respect to securities. Under these rules, beneficial ownership includes any shares as to which the individual or entity has sole or shared voting power or investment power and includes any shares that an individual or entity has the right to acquire beneficial ownership of within 60 days of October 13, 2015, through the exercise of any warrant, stock option, or other right. Unless otherwise indicated, the address of all listed stockholders is c/o Axsome Therapeutics, Inc., 25 Broadway, 9th Floor, New York, NY 10004. Each of the stockholders listed has sole voting and investment power with respect to the shares beneficially owned by the stockholder unless noted otherwise, subject to community property laws where applicable.

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DESCRIPTION OF CAPITAL STOCK

        The following description of our capital stock and provisions of our certificate of incorporation and bylaws are summaries and are qualified by reference to the amended and restated certificate of incorporation and the amended and restated bylaws that will be in effect upon the completion of this offering. We have filed copies of these documents with the Securities and Exchange Commission as exhibits to our registration statement, of which this prospectus forms a part. The descriptions of our common stock and preferred stock reflect changes to our capital structure that will occur upon the completion of this offering. We refer in this section to our amended and restated certificate of incorporation and amended and restated bylaws that we intend to adopt in connection with this offering as our certificate of incorporation and bylaws, respectively.

        Upon consummation of this offering, our authorized capital stock will consist of            shares of common stock, par value $0.0001 per share, and            shares of preferred stock, par value $0.0001 per share, all of which preferred stock will remain undesignated.

        As of June 30, 2015, we had outstanding 1,512,449 shares of common stock, held by 46 stockholders of record. In addition, as of June 30, 2015, we had outstanding options to purchase 122,430 shares of common stock and warrants to purchase 37,099 shares of common stock.

Common Stock

        Holders of common stock are entitled to one vote for each share held on all matters submitted to a vote of stockholders and do not have cumulative voting rights. Accordingly, holders of a majority of the shares of common stock entitled to vote in any election of directors may elect all of the directors standing for election. Holders of common stock are entitled to receive proportionately any dividends as may be declared by our board of directors, subject to any preferential dividend rights of outstanding preferred stock.

        In the event of our liquidation, dissolution, or winding up, the holders of common stock are entitled to receive proportionately our net assets available after the payment of all debts and other liabilities and subject to the prior rights of any outstanding preferred stock. Holders of common stock have no preemptive, subscription, redemption, or conversion rights. Our outstanding shares of common stock are and the shares offered by us in this offering will be, when issued and paid for, validly issued, fully paid, and nonassessable. The rights, preferences, and privileges of holders of common stock are subject to and may be adversely affected by, the rights of the holders of shares of any series of preferred stock that we may designate and issue in the future.

Preferred Stock

        Under the terms of our certificate of incorporation, our board of directors will be authorized to issue shares of preferred stock in one or more series without stockholder approval. Our board of directors will have the discretion to determine the rights, preferences, privileges, and restrictions, including voting rights, dividend rights, conversion rights, redemption privileges, and liquidation preferences of each series of preferred stock.

        The purpose of authorizing our board of directors to issue preferred stock and determine its rights and preferences is to eliminate delays associated with a stockholder vote on specific issuances. The issuance of preferred stock, while providing flexibility in connection with possible acquisitions, future financings, and other corporate purposes, could have the effect of making it more difficult for a third party to acquire, or could discourage a third party from seeking to acquire, a majority of our outstanding voting stock. Upon completion of this offering, there will be no shares of preferred stock outstanding and we have no present plans to issue any shares of preferred stock.

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Options

        As of June 30, 2015, options to purchase an aggregate of 121,556 shares were outstanding under our 2013 Equity Compensation Plan, and options to purchase an aggregate of 874 shares were outstanding outside of our 2013 Equity Compensation Plan, at a weighted average exercise price of $20.91 per share, of which options to purchase 50,260 shares were exercisable. As of that date, an additional 13,444 shares were available for issuance under our 2013 Equity Compensation Plan. For additional information regarding the terms of our 2013 Equity Compensation Plan, please see "Executive and Director Compensation—2013 Equity Compensation Plan."

Warrants

        As of June 30, 2015, warrants to purchase an aggregate of 31,372 shares of our common stock at an exercise price of $9.55 per share were outstanding. The warrants expire in October 2018. The warrants contain provisions for the adjustment of the exercise price and the number of shares issuable upon the exercise of the applicable warrant in the event of certain stock dividends, stock splits, reorganizations, reclassifications, and consolidations.

        As of June 30, 2015, warrants to purchase an aggregate of 5,727 shares of our common stock at a current exercise price of $43.64 per share were outstanding. The warrants expire in November 2019. The warrant price will automatically adjust to a 10% premium to the conversion price of the convertible notes we issued from September 2014 through November 2014 during a mandatory conversion, defined in the notes as the occurrence of an equity financing of at least $2,000,000 in gross aggregate cash proceeds, in which the conversion price would be equal to $39.67 per share, as adjusted for capitalization changes; provided, however, if the initial public offering price is less than $39.67 per share, then the note conversion price will equal 75% of the initial public offering price. The warrants contain provisions for the adjustment of the exercise price and the number of shares issuable upon the exercise of the applicable warrant in the event of certain stock dividends, stock splits, reorganizations, reclassifications, and consolidations.

Delaware Law and Certain Certificate of Incorporation and Bylaw Provisions

        The provisions of Delaware law and of our certificate of incorporation and bylaws discussed below could discourage or make it more difficult to accomplish a proxy contest or other change in our management or the acquisition of control by a holder of a substantial amount of our voting stock. It is possible that these provisions could make it more difficult to accomplish, or could deter, transactions that stockholders may otherwise consider to be in their best interests or the best interests of the company.

•

Business Combinations.  We are subject to the provisions of Section 203 of the General Corporation Law of Delaware. Section 203 prohibits a publicly held Delaware corporation from engaging in a "business combination" with an "interested stockholder" for a period of three years after the date of the transaction in which the person became an interested stockholder, unless the business combination is approved in a prescribed manner. A "business combination" includes mergers, asset sales, and other transactions resulting in a financial benefit to the interested stockholder. Subject to specified exceptions, an "interested stockholder" is a person who, together with affiliates and associates, owns, or within three years did own, 15% or more of the corporation's voting stock.



•

Limitation of Liability; Indemnification.  Our certificate of incorporation contains provisions permitted under the General Corporation Law of Delaware relating to the liability of directors. The provisions eliminate, to the extent legally permissible, a director's liability for monetary damages for a breach of fiduciary duty, except in circumstances involving wrongful acts, such as the breach of a director's duty of loyalty or acts or omissions that involve intentional misconduct

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or a knowing violation of law. The limitation of liability described above does not alter the liability of our directors and officers under federal securities laws. Furthermore, our certificate of incorporation contains provisions to indemnify our directors and officers to the fullest extent permitted by the General Corporation Law of Delaware. These provisions do not limit or eliminate our right or the right of any stockholder of ours to seek non-monetary relief, such as an injunction or rescission in the event of a breach by a director or an officer of his duty of care to us. We believe that these provisions assist us in attracting and retaining qualified individuals to serve as directors.

•

Forum.  Our certificate of incorporation provides that, unless we consent in writing to the selection of an alternative forum, the Court of Chancery of the State of Delaware will be the sole and exclusive forum for any derivative action or proceeding brought on our behalf, any action asserting a claim of breach of a fiduciary duty owed by any director, officer, or other employee of the company to us or our stockholders, any action asserting a claim arising pursuant to any provision of the Delaware General Corporation Law, or any action asserting a claim governed by the internal affairs doctrine. Our certificate of incorporation further provides that any person or entity purchasing or otherwise acquiring any interest in shares of our capital stock is deemed to have notice of and consented to the foregoing provision.

        In addition to the foregoing, our certificate of incorporation and bylaws to be in effect upon completion of this offering contain provisions that could delay or prevent a change of control of our company or changes in our board of directors that our stockholders might consider favorable. Some of these provisions:

•

authorize the issuance of preferred stock which can be created and issued by the board of directors without prior stockholder approval, with rights senior to those of our common stock;



•

provide for a classified board of directors, with each director serving a staggered three-year term;



•

prohibit our stockholders from filling board vacancies, calling special stockholder meetings, or taking action by written consent;



•

provide for the removal of a director only with cause and by the affirmative vote of the holders of 66²/3% or more of the shares then entitled to vote at an election of our directors; and



•

require advance written notice of stockholder proposals and director nominations.

Transfer Agent and Registrar

        The transfer agent and registrar for our common stock is American Stock Transfer & Trust Company, LLC.

NASDAQ Market

        We intend to apply to list our common stock on the NASDAQ            Market under the symbol "AXSM."

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SHARES ELIGIBLE FOR FUTURE SALE

        Prior to this offering, there has been no market for our common stock, and we cannot assure you that a liquid trading market for our common stock will develop or be sustained after this offering. Future sales of substantial amounts of common stock, including shares issued upon exercise of options and warrants, in the public market after this offering, or the anticipation of those sales, could adversely affect market prices prevailing from time to time and could impair our ability to raise capital through sales of our equity securities.

        Based on shares outstanding as of June 30, 2015, upon completion of this offering, we will have outstanding            shares of common stock, after giving effect to the automatic conversion of all principal and interest accrued as of the date of this prospectus under our outstanding convertible notes into            shares of common stock, assuming an initial public offering price of $            per share, which is the midpoint of the price range set forth on the cover page of this prospectus, or            shares of common stock if the underwriters exercise their over-allotment option in full.

        Of these shares, the            shares sold in this offering will be freely tradable without restriction under the Securities Act unless purchased by our "affiliates," as that term is defined in Rule 144 under the Securities Act. The remaining            shares of common stock to be outstanding after this offering are "restricted securities" under Rule 144. All of these restricted securities will be subject to the 180-day lock-up period described below. After the 180-day period,            shares will be freely tradable under Rule 144(b)(1) and            shares will be eligible for resale under Rule 144, subject to volume limitations. An additional            shares will become freely tradable under Rule 144(b)(1) in            .

        Restricted securities may be sold in the public market only if registered or if they qualify for an exemption from registration under Rule 144 or 701 under the Securities Act, which rules are summarized below.

Rule 144

        In general, under Rule 144 as currently in effect, beginning 90 days after the date of this prospectus, any person who is not deemed an affiliate during the preceding three months and has held their shares for at least six months, including the holding period of any prior owner other than one of our affiliates, may sell shares without restriction, subject only to the availability of current public information about us. In addition, under Rule 144, any person who is not an affiliate of ours and has held their shares for at least one year, including the holding period of any prior owner other than one of our affiliates, would be entitled to sell an unlimited number of shares immediately upon the closing of this offering without regard to whether current public information about us is available.

        Beginning 90 days after the date of this prospectus, a person who is our affiliate or who was our affiliate at any time during the preceding three months and who has beneficially owned restricted securities for at least six months, including the holding period of any prior owner other than one of our affiliates, is entitled to sell a number of shares within any three-month period that does not exceed the greater of:

•

1% of the number of shares of our common stock then outstanding, which will equal approximately            shares immediately after this offering; and



•

the average weekly trading volume of our common stock on NASDAQ during the four calendar weeks preceding the filing of a Notice of Proposed Sale of Securities Pursuant to Rule 144 with respect to the sale.

        Sales under Rule 144 by our affiliates or persons selling on behalf of our affiliates are also subject to manner of sale provisions and notice requirements and to the availability of current public information about us.

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        Upon expiration of the 180-day lock-up period described below, approximately            shares of our common stock will be eligible for sale under Rule 144. We cannot estimate the number of shares of our common stock that our existing stockholders will elect to sell under Rule 144.

Rule 701

        In general, under Rule 701 as currently in effect, any of an issuer's employees, directors, officers, consultants, or advisors who purchases shares from the issuer in connection with a compensatory stock or option plan or other written agreement before the effective date of a registration statement under the Securities Act is entitled to sell such shares 90 days after such effective date in reliance on Rule 144. An affiliate of the issuer can resell shares in reliance on Rule 144 without having to comply with the holding period requirement, and non-affiliates of the issuer can resell shares in reliance on Rule 144 without having to comply with the current public information and holding period requirements.

Lock-Up Agreements

        In connection with this offering, we, our directors, our executive officers and holders of substantially all of our outstanding common stock have agreed with the underwriters, subject to certain exceptions that are described in more detail in the section in this prospectus entitled "Underwriting," not to dispose of or hedge any shares of our common stock or securities convertible into or exchangeable for shares of common stock during the period from the date of the lock-up agreement continuing through the date 180 days after the date of this prospectus, except with the prior written consent of the representative of the underwriters. Each of the underwriters has advised us that they have no current intent or arrangement to release any of the shares subject to the lock-up agreements prior to the expiration of the lock-up period. The lock-up agreements permit stockholders to transfer common stock and other securities subject to the lock-up agreements in certain circumstances.

        Following the lock-up periods set forth in the agreements described above, and assuming that the representative of the underwriters do not release any parties from these agreements and that there is no extension of the lock-up period, all of the shares of our common stock that are restricted securities or are held by our affiliates as of the date of this prospectus will be eligible for sale in the public market in compliance with Rule 144 under the Securities Act.

Equity Compensation Plans

        We intend to file one or more registration statements on Form S-8 under the Securities Act to register all shares of common stock subject to outstanding stock options and common stock issuable under our equity compensation plans, including the equity compensation plans we plan to adopt in connection with this offering. Accordingly, shares registered under such registration statement will be available for sale in the open market, unless such shares are subject to vesting restrictions with us or the lock-up restrictions described above. Our equity compensation plans are described in more detail under "Executive Compensation."

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MATERIAL U.S. FEDERAL INCOME TAX CONSEQUENCES TO NON-U.S. HOLDERS

        The following is a general discussion of the material U.S. federal income tax consequences of the acquisition, ownership, and disposition of our common stock by "Non-U.S. Holders" (as defined below). This discussion is a summary for general information purposes only and does not consider all aspects of U.S. federal income taxation that may be relevant to particular Non-U.S. Holders in light of their individual circumstances or to certain types of Non-U.S. Holders subject to special tax rules, including partnerships or other pass-through entities for U.S. federal income tax purposes, banks, financial institutions or other financial services entities, broker-dealers, insurance companies, tax-exempt organizations, regulated investment companies, real estate investment trusts, controlled foreign corporations, passive foreign investment companies, corporations that accumulate earnings to avoid U.S. federal income tax, persons who use or are required to use mark-to-market accounting, persons that hold our common stock as part of a "straddle," a "hedge," a "conversion transaction" or an "integrated transaction," certain former citizens or permanent residents of the U.S., persons who received our common stock in connection with the performance of services or who own, or are deemed to own, 5% or more, by voting power or value, of our common stock, or persons subject to the alternative minimum tax. In addition, this summary does not address the effects of any applicable gift or estate tax, and this summary does not address the potential application of the Medicare contribution tax or any tax considerations that may apply to Non-U.S. Holders of our common stock under state, local, or non-U.S. tax laws and any other U.S. federal tax laws.

        This summary is based on the Internal Revenue Code of 1986, as amended, or the Code, and applicable Treasury Regulations, rulings, administrative pronouncements, and decisions, in each case, as in effect and available as of the date of this prospectus, all of which are subject to change or differing interpretations at any time with possible retroactive effect. We have not sought, and will not seek, any ruling from the Internal Revenue Service, or the IRS, with respect to the tax consequences discussed herein, and there can be no assurance that the IRS will not take a position contrary to the tax consequences discussed below or that any position taken by the IRS would not be sustained. This discussion assumes that a Non-U.S. Holder will hold our common stock as a capital asset within the meaning of the Code (generally, property held for investment).

        The following discussion is for general information only and is not tax advice for any Non-U.S. Holder under its particular circumstances. Persons considering the purchase of our common stock pursuant to this offering should consult their own tax advisors concerning the U.S. federal income, estate, and gift tax consequences of acquiring, owning, and disposing of our common stock in light of their particular situations as well as any consequences arising under the laws of any other taxing jurisdiction, including any state, local, and non-U.S. tax consequences.

        For purposes of this discussion, the term "Non-U.S. Holder" means a beneficial owner of our common stock that is not a U.S. person and is not a partnership (or entity or arrangement treated as a partnership for U.S. federal income tax purposes). A U.S. person is any one of the following:

•

an individual who is a citizen or resident of the U.S.;



•

a corporation (or other entity treated as a corporation for U.S. federal income tax purposes) created or organized in the U.S. or under the laws of the U.S. or of any state thereof or the District of Columbia;



•

an estate, the income of which is subject to U.S. federal income tax regardless of its source; or



•

a trust if (1) a U.S. court can exercise primary supervision over the trust's administration and one or more U.S. persons have the authority to control all of the trust's substantial decisions or (2) the trust has a valid election in effect under applicable U.S. Treasury Regulations to be treated as a U.S. person.

        If a partnership (or entity or arrangement treated as a partnership for U.S. federal income tax purposes) is a beneficial owner of our common stock, the tax treatment of such partnership, and a partner in the partnership, will generally depend upon the status of the partner, the activities of the

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partnership, and certain determinations made at the partner level. If you are a partnership, or a partner of a partnership, holding shares of our common stock, you should consult your tax advisor regarding the tax consequences of the purchase, ownership, and disposition of our common stock.

        PROSPECTIVE INVESTORS SHOULD CONSULT THEIR TAX ADVISORS REGARDING THE PARTICULAR U.S. FEDERAL INCOME TAX CONSEQUENCES TO THEM OF ACQUIRING, OWNING, AND DISPOSING OF OUR COMMON STOCK, AS WELL AS ANY TAX CONSEQUENCES ARISING UNDER ANY STATE, LOCAL, OR FOREIGN TAX LAWS AND ANY OTHER U.S. FEDERAL TAX LAWS.

Distributions on Our Common Stock

        In general, subject to the discussions below under "Information Reporting and Backup Withholding" and "Foreign Accounts," distributions, if any, paid to a Non-U.S. Holder (to the extent paid out of our current or accumulated earnings and profits, as determined under U.S. federal income tax principles) will constitute dividends and be subject to U.S. withholding tax at a rate equal to 30% of the gross amount of the dividend, or a lower rate prescribed by an applicable income tax treaty, unless the dividends are effectively connected with a trade or business carried on by the Non-U.S. Holder within the U.S. Any distribution not constituting a dividend (because such distribution exceeds our current and accumulated earnings and profits) will be treated first as reducing the Non-U.S. Holder's basis in its shares of common stock, but not below zero, and to the extent it exceeds the Non-U.S. Holder's basis, as capital gain (see "—Gain on Sale, Exchange, or Other Disposition of Our Common Stock" below).

        A Non-U.S. Holder who claims the benefit of an applicable income tax treaty generally will be required to satisfy certain certification and other requirements prior to the distribution date. Non-U.S. Holders must generally provide the withholding agent with a properly executed IRS Form W-8BEN or Form W-8BEN-E claiming an exemption from or reduction in withholding under an applicable income tax treaty. This certification must be updated periodically. If a Non-U.S. Holder holds our common stock through a financial institution or other agent acting on the Non-U.S. Holder's behalf, the Non-U.S. Holder will be required to provide appropriate documentation to the agent, who then will be required to provide certification to us or our paying agent, either directly or through other intermediaries. If tax is withheld in an amount in excess of the amount applicable under an income tax treaty, a refund of the excess amount may generally be obtained by timely filing an appropriate claim for refund with the IRS. Non-U.S. Holders should consult their tax advisors regarding their entitlement to benefits under an applicable income tax treaty.

        Dividends that are effectively connected with a Non-U.S. Holder's conduct of a U.S. trade or business (and, if required by an applicable income tax treaty, attributable to a U.S. permanent establishment or fixed base of the Non-U.S. Holder) generally will not be subject to U.S. withholding tax if the Non-U.S. Holder provides the withholding agent with the required forms, including IRS Form W-8ECI, but instead generally will be subject to U.S. federal income tax on a net income basis at the regular graduated rates in the same manner as if the Non-U.S. Holder were a resident of the U.S. A corporate Non-U.S. Holder that receives effectively connected dividends may also be subject to an additional branch profits tax at a rate of 30% (or a lower rate prescribed by an applicable income tax treaty) of its effectively connected earnings and profits for the taxable year, as adjusted for certain items.

Gain on Sale, Exchange, or Other Disposition of Our Common Stock

        In general, subject to the discussions below under "Information Reporting and Backup Withholding" and "Foreign Accounts," a Non-U.S. holder will not be subject to any U.S. federal

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income tax or withholding tax on any gain realized upon such holder's sale, exchange, or other disposition of shares of our common stock unless:

(i)

the gain is effectively connected with a trade or business carried on by the Non-U.S. Holder within the U.S. (and, if required by an applicable income tax treaty, attributable to a U.S. permanent establishment or fixed base of the Non-U.S. Holder);



(ii)

the Non-U.S. Holder is an individual who is present in the U.S. for 183 days or more in the taxable year of disposition and certain other conditions are met; or



(iii)

we are or have been a "United States real property holding corporation" for U.S. federal income tax purposes at any time during the shorter of the five-year period ending on the date of disposition or the period that the Non-U.S. Holder held the common stock, and, in the case where shares of our common stock are regularly traded on an established securities market, the Non-U.S. Holder owns, or is treated as owning, more than five percent of our common stock at any time during the foregoing period.

        Net gain realized by a Non-U.S. Holder described in clause (i) above generally will be subject to U.S. federal income tax in the same manner as if the Non-U.S. Holder were a U.S. person. Any gains of a corporate Non-U.S. Holder described in clause (i) above may also be subject to an additional branch profits tax at a 30% rate, or such lower rate as may be specified by an applicable income tax treaty.

        Gain realized by an individual Non-U.S. Holder described in clause (ii) above will be subject to a flat 30% tax (or such lower rate specified by an applicable income tax treaty), which gain may be offset by certain U.S. source capital losses, even though the individual is not considered a resident of the U.S.

        For purposes of clause (iii) above, a corporation is a "United States real property holding corporation" if the fair market value of its U.S. real property interests equals or exceeds 50% of the sum of the fair market value of its worldwide real property interests plus its other assets used or held for use in a trade or business. We believe that we are not, and we do not anticipate that we will become, a United States real property holding corporation. However, because the determination of whether we are a United States real property holding corporation depends on the fair market value of our U.S. real property interests relative to the fair market value of our other business assets, there can be no assurance that we will not become a United States real property holding corporation in the future. If we become a United States real property holding corporation, as long as our common stock is regularly traded on an established securities market, our common stock will be treated as a U.S. real property interest only with respect to a Non-U.S. Holder that actually or constructively held more than 5% of our common stock at any time during the shorter of the two periods described in clause (iii) above. If gain on the sale or other taxable disposition of our common stock were subject to taxation under clause (iii) above, the Non-U.S. Holder would be subject to regular U.S. federal income tax with respect to such gain in generally the same manner as a U.S. person.

U.S. Federal Estate Tax

        An individual who at the time of death is not a citizen or resident of the United States and who is treated as the owner of an interest in our common stock will be required to include the value thereof in his or her taxable estate for U.S. federal estate tax purposes, and may be subject to U.S. federal estate tax unless an applicable estate tax treaty provides otherwise. The test for whether an individual is a resident of the United States for U.S. federal estate tax purposes differs from the test used for U.S. federal income tax purposes. Some individuals, therefore, may be "Non-U.S. Holders" for U.S. federal income tax purposes, but not for U.S. federal estate tax purposes, and vice versa.

Information Reporting and Backup Withholding

        Generally, we must report annually to the IRS and to each Non-U.S. Holder the amount of dividends paid, the name and address of the recipient, and the amount, if any, of tax withheld. These

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information reporting requirements apply even if withholding was not required because the dividends were effectively connected with the Non-U.S. Holder's conduct of a trade or business within the U.S. or withholding was reduced by an applicable income tax treaty. Under applicable income tax treaties or other agreements, the IRS may make its reports available to the tax authorities in the Non-U.S. Holder's country of residence.

        Dividends paid to a Non-U.S. Holder that is not an exempt recipient generally will be subject to backup withholding, currently at a rate of 28%, unless the Non-U.S. Holder certifies to the withholding agent as to its foreign status, which certification may generally be made on IRS Form W-8BEN, Form W-8BEN-E or other appropriate version of IRS Form W-8. Notwithstanding the foregoing, backup withholding may apply if either we or our paying agent has actual knowledge, or reason to know, that the holder is a U.S. person that is not an exempt recipient.

        Proceeds from the sale or other disposition of common stock by a Non-U.S. Holder effected by or through a U.S. office of a broker will generally be subject to information reporting and backup withholding, currently at a rate of 28%, unless the Non-U.S. Holder certifies to the withholding agent under penalties of perjury as to, among other things, its name, address, and status as a Non-U.S. Holder or otherwise establishes an exemption. Payment of disposition proceeds effected outside the U.S. by or through a non-U.S. office of a non-U.S. broker generally will not be subject to information reporting or backup withholding if the payment is not received in the U.S. Information reporting, but generally not backup withholding (provided the broker does not have actual knowledge or reason to know that the holder is a U.S. person that is not an exempt recipient), will apply to such a payment if the broker has certain connections with the U.S. unless the broker has documentary evidence in its records that the beneficial owner thereof is a Non-U.S. Holder and specified conditions are met or an exemption is otherwise established.

        Backup withholding is not an additional tax. Any amount withheld under the backup withholding rules from a payment to a Non-U.S. Holder that results in an overpayment of taxes generally will be refunded, or credited against the holder's U.S. federal income tax liability, if any, provided that the required information is timely furnished to the IRS.

Foreign Accounts

        A U.S. federal withholding tax of 30% may apply to dividends and the gross proceeds of a disposition of our common stock paid to a "foreign financial institution" (as specially defined under applicable rules) unless such institution enters into an agreement with the U.S. government to withhold on certain payments and to collect and provide to the U.S. tax authorities substantial information regarding certain U.S. account holders of such institution (which includes certain equity holders of such institution, as well as certain account holders that are foreign entities with U.S. owners). This U.S. federal withholding tax of 30% will also apply to payments of dividends and the gross proceeds of a disposition of our common stock paid to a "non-financial foreign entity" (as specially defined under applicable rules) unless such entity either certifies it does not have any substantial U.S. owners or provides the withholding agent with a certification identifying substantial direct and indirect U.S. owners of the entity. The withholding tax described above will not apply if the foreign financial institution or non-financial foreign entity otherwise qualifies for an exemption from the rules. Under certain circumstances, a Non-U.S. Holder might be eligible for refunds or credits of such taxes. The U.S. has entered into agreements with certain countries that modify these general rules for entities located in those countries. Prospective investors are encouraged to consult with their own tax advisors regarding the possible implications of this legislation on their investment in our common stock.

        The withholding provisions described above generally will apply to payments of dividends, to payments of gross proceeds from a sale or other disposition of our common stock on or after January 1, 2017, and to certain "pass-thru payments" made after the later of January 1, 2017, and the date final Treasury Regulations are issued defining such pass-thru payments. Because we may not know the extent to which a distribution is a dividend for U.S. federal income tax purposes at the time it is made, for purposes of these withholding rules we may treat the entire distribution as a dividend. Prospective investors should consult their tax advisors regarding these withholding provisions.

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UNDERWRITING

        Ladenburg Thalmann & Co. Inc. is acting as the sole book-running manager of this offering and as the representative of the underwriters named below. Subject to the terms and conditions set forth in an underwriting agreement dated the date of this prospectus among us and the representative of the underwriters named below, we have agreed to sell to the underwriters, and each underwriter has severally agreed to purchase from us, the number of shares of common stock set forth opposite its name below.

        The underwriters are offering the shares, subject to prior sale, when, as, and if issued to and accepted by them, subject to approval of legal matters by their counsel, and other conditions contained in the underwriting agreement. Subject to the terms and conditions set forth in the underwriting agreement, the underwriters have agreed, severally and not jointly, to purchase all of the shares sold under the underwriting agreement if any of these shares are purchased. If an underwriter defaults, the underwriting agreement provides that the purchase commitments of the nondefaulting underwriters may be increased or the underwriting agreement may be terminated. However, the underwriters are not obligated to purchase the shares of common stock covered by the over-allotment option described below.

Discounts and Commissions

        The underwriters initially propose to offer part of the shares to the public at the public offering price set forth on the cover page of this prospectus and part to certain dealers. After the initial offering of the shares, the public offering price and other selling terms may be changed by the representative.

        The following table shows the public offering price, underwriting discounts and commissions and proceeds before expenses to us. The information assumes either no exercise or full exercise of the option we granted to the underwriters to purchase additional shares.

        We estimate expenses payable by us in connection with this offering, other than the underwriting discounts and commissions referred to above, will be approximately $            . We have agreed to reimburse the underwriters for expenses relating to clearance of this offering with the Financial Industry Regulatory Authority, Inc. up to $            .

        The underwriters have informed us that they do not expect to sell more than 5% of the shares in the aggregate to accounts over which they exercise discretionary authority.

Over-Allotment Option

        We have granted to the underwriters an option, exercisable for 30 days from the date of this prospectus, to purchase up to             additional shares from us at the public offering price set forth on the cover page of this prospectus, less underwriting discounts and commissions. The underwriters may exercise this option solely for the purpose of covering over-allotments, if any, made in connection with

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the offering of the shares offered by this prospectus. If the underwriters exercise this option, each underwriter will be obligated, subject to conditions contained in the underwriting agreement, to purchase a number of additional shares proportionate to that underwriter's initial purchase commitment as indicated in the table above.

Lock-Up Agreements

        We, all of our officers and directors, and holders of substantially all of our outstanding shares of common stock have agreed that, for a period of 180 days after the date of this prospectus, or the restricted period, subject to certain limited exceptions described below, we and they will not directly or indirectly, without the prior written consent of the representative:

(1)

offer, pledge, assign, encumber, announce the intention to sell, sell, contract to sell, sell any option or contract to purchase, purchase any option or contract to sell, grant any option, right or warrant to purchase, or otherwise transfer or dispose of, any shares of our common stock or any securities convertible into or exercisable or exchangeable for our common stock;



(2)

enter into any swap or other agreement that transfers, in whole or in part, any of the economic consequences of ownership of our common stock; whether any such transaction described in clause (1) or (2) above is to be settled by delivery of common stock or such other securities, in cash or otherwise;



(3)

make any demand for or exercise any right with respect to, the registration of any shares of our common stock or any security convertible into or exercisable or exchangeable for our common stock; or



(4)

publicly announce an intention to do any of the foregoing.

        In addition, we have agreed that, without the prior written consent of the representative on behalf of the underwriters, we will not, during the restricted period, file any registration statement with the SEC relating to the offering of any shares of our common stock or any securities convertible into or exercisable or exchangeable for our common stock.

        The restrictions described above do not apply to:

(1)

the sale of shares of our common stock to the underwriters pursuant to the terms of the underwriting agreement;



(2)

the issuance by us of shares of our common stock upon the exercise or conversion of a security outstanding on the date of this prospectus and described herein or of which the underwriters have been advised in writing;



(3)

the issuance by us of shares of our common stock, options to purchase shares of our common stock, or other equity awards pursuant to our equity compensation plans disclosed herein;



(4)

the filing by us of a registration statement on Form S-8 or a successor form thereto;



(5)

the issuance by us of shares of our common stock or securities convertible into, exchangeable for or that represent the right to receive shares of our common stock pursuant to an agreement in effect as of the date of this prospectus, provided that all recipients of any such securities enter into lock-up agreements;



(6)

our entry into an agreement to issue shares of our common stock or securities convertible into, exchangeable for or that represent the right to receive shares of our common stock in connection with our consummation of a strategic partnership, joint venture, collaboration or acquisition or license of any business products or technology, provided that (i) the aggregate number of shares of our common stock that we may issue or agree to issue shall not exceed

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5% of the total number of shares of our common stock outstanding immediately following the completion of this offering, (ii) all recipients of any such securities shall enter into lock-up agreements, and (iii) we provide the representative reasonable advance notice of our entry into any such agreement;

(7)

transactions by any person other than us relating to shares of our common stock or other securities acquired in this offering or open market transactions after the completion of this offering; provided that no filing or public announcement under Section 16(a) of the Exchange Act or otherwise shall be required or shall be voluntarily made in connection with subsequent sales of common stock or other securities acquired in such open market transactions;



(8)

transfers of shares of common stock or any security convertible into or exercisable or exchangeable for common stock: (i) to the spouse, domestic partner, parent, sibling, child, or grandchild (each, an immediate family member) of the holder or to a trust, partnership, limited liability company, or other entity formed for the benefit of the holder or of an immediate family member of the holder; (ii) by a bona fide gift, will, or intestacy; (iii) if the holder is a corporation, partnership, limited liability company, or other business entity (A) to another corporation, partnership, limited liability company, or other business entity that controls, is controlled by or is under common control with the holder or (B) as part of a disposition, transfer or distribution by the holder to its limited partners, members, or equity holders; (iv) if the holder is a trust, to a trustor or beneficiary of the trust; or (v) to a nominee or custodian of a person or entity to whom a disposition or transfer would be permissible under clauses (i) through (iv) above; provided that in the case of any transfer or distribution pursuant to this exception, (A) each donee, transferee, or distributee shall sign and deliver a lock-up agreement substantially in the form entered into by the holder and (B) no filing under Section 16(a) of the Exchange Act, reporting a reduction in beneficial ownership of shares of common stock, shall be required or shall be voluntarily made during the restricted period;



(9)

the receipt by the holder from us of shares of common stock upon the vesting of restricted stock awards or other securities convertible into common stock or upon the exercise of options or warrants, or the transfer of shares of common stock or any securities convertible into common stock to us upon a vesting event of our securities or upon the exercise of options or warrants to purchase our securities, in each case on a "cashless" or "net exercise" basis or to cover tax withholding obligations of the holder in connection with such vesting or exercise; provided that no filing under Section 16(a) of the Exchange Act, reporting a reduction in beneficial ownership of shares of common stock, shall be required or shall be voluntarily made during the restricted period;



(10)

the establishment of a trading plan that complies with Rule 10b5-1 under the Exchange Act for the transfer of shares of common stock; provided that (i) such plan does not provide for the transfer of common stock during the restricted period and (ii) to the extent a public announcement or filing under the Exchange Act or otherwise, if any, is required or voluntarily made regarding the establishment of such plan, such announcement or filing shall include a statement to the effect that no transfer of common stock may be made under such plan during the restricted period;



(11)

transfers of shares of common stock or any security convertible into or exercisable or exchangeable for common stock pursuant to an order of a court or regulatory agency; provided that (i) each transferee shall sign and deliver a lock-up agreement and (ii) any filings

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under Section 16(a) of the Exchange Act shall state that the transfer is by order of such court or regulatory agency, as the case may be; or

(12)

transfer of shares of common stock or any security convertible into or exercisable or exchangeable for common stock occurring after the completion of this offering pursuant to a bona fide third-party tender offer, merger, consolidation or other similar transaction made to all holders of our common stock and other securities, involving a change of control of us, provided that until such tender offer, merger, consolidation, or other such transaction is completed, the common stock shall remain subject to the restrictions contained in the applicable lock-up agreement.

        The representative of the underwriters, in its sole discretion, may release our common stock and other securities subject to the lock-up agreements described above in whole or in part at any time.

Offering Price Determination

        Prior to the completion of this offering, there has been no public market for our common stock. The initial public offering price will be determined by negotiations between us and the representative. Among the factors considered in determining the initial public offering price will be the history and prospects of other companies in the industry in which we compete; our financial information; an assessment of our management and their experience; an assessment of our business potential and earning prospects; the prevailing securities markets at the time of this offering; the recent market prices of, and the demand for, publicly traded shares of generally comparable companies; and other factors deemed relevant. Neither we nor any of the underwriters can assure investors that an active trading market will develop for our common shares, or that the shares will trade in the public market at or above the initial public offering price.

Indemnification

        We have agreed to indemnify the underwriters against certain liabilities, including liabilities under the Securities Act, and to contribute to payments that the underwriters may be required to make for these liabilities.

Stabilization, Short Positions, and Penalty Bids

        In order to facilitate this offering of our common stock, the underwriters may engage in stabilizing transactions, short sales, and purchases to cover positions created by short sales, and penalty bids or purchases for the purpose of pegging, fixing, or maintaining the price of our common stock, in accordance with Regulation M under the Exchange Act. These activities may have the effect of stabilizing or maintaining the market price of the common stock at a level above that which might otherwise prevail in the open market.

        A short position involves a sale by the underwriters of shares in excess of the number of shares the underwriters are obligated to purchase in the offering, which creates the syndicate short position. This short position may be either a covered short position or a naked short position. In a covered short position, the number of shares involved in the sales made by the underwriters in excess of the number of shares they are obligated to purchase is not greater than the number of shares that they may purchase by exercising their over-allotment option. In a naked short position, the number of shares involved is greater than the number of shares in their over-allotment option. The underwriters may close out any short position by either exercising their over-allotment option and/or purchasing shares in the open market. In determining the source of shares to close out the short position, the underwriters will consider, among other things, the price of shares available for purchase in the open market as compared to the price at which they may purchase shares through their over-allotment option. A naked short position is more likely to be created if the underwriters are concerned that there could be

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downward pressure on the price of the shares in the open market after pricing that could adversely affect investors who purchase in the offering.

        A stabilizing bid is a bid for the purchase of shares of common stock on behalf of the underwriters for the purpose of fixing or maintaining the price of the common stock. A syndicate covering transaction is the bid for or the purchase of shares of common stock on behalf of the underwriters to reduce a short position incurred by the underwriters in connection with the offering. Similar to other purchase transactions, the underwriters' purchases to cover the syndicate short sales may have the effect of raising or maintaining the market price of our common stock or preventing or retarding a decline in the market price of our common stock. As a result, the price of our common stock may be higher than the price that might otherwise exist in the open market. A penalty bid is an arrangement permitting the underwriters to reclaim the selling concession otherwise accruing to a syndicate member in connection with the offering if the common stock originally sold by such syndicate member are purchased in a syndicate covering transaction and therefore have not been effectively placed by such syndicate member.

        Neither we nor any of the underwriters make any representation or prediction as to the direction or magnitude of any effect that the transactions described above may have on the price of our common stock. The underwriters are not obligated to engage in these activities and, if commenced, any of the activities may be discontinued at any time without notice.

Listing on the NASDAQ             Market

        We intend to apply to list our common stock on the NASDAQ                         Market under the symbol "AXSM."

Electronic Distribution

        A prospectus in electronic format may be made available on websites maintained by one or more underwriters, or selling group members, if any, participating in this offering. The representative may agree to allocate a number of shares of our common stock to underwriters for sale to their online brokerage account holders. Internet distributions will be allocated by the representative to underwriters that may make internet distributions on the same basis as other allocations.

Other Relationships

        The underwriters and their respective affiliates are full service financial institutions engaged in various activities, which may include securities trading, commercial and investment banking, financial advisory, investment management, investment research, principal investment, hedging, financing, and brokerage activities. Certain of the underwriters and their respective affiliates have, from time to time, performed, and may in the future perform, various financial advisory, investment banking, and other services for us, for which they have received and may continue to receive customary fees and commissions. In addition, in the ordinary course of their various business activities, the underwriters and their respective affiliates may effect transactions for their own account or the accounts of customers, and hold on behalf of themselves or their customers, long or short positions in our debt or equity securities or loans, and may do so in the future. The underwriters and their respective affiliates may also make investment recommendations or publish or express independent research views in respect of such securities or instruments and may at any time hold, or recommend to their customers that they acquire, long or short positions in such securities and instruments.

Directed Share Program

        At our request, the underwriters have reserved up to        % of the shares of our common stock being offered by this prospectus for sale at the initial public offering price to our directors, officers and

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employees and their friends and family members. The number of shares of our common stock available for sale to the general public will be reduced to the extent these individuals purchase such reserved shares. Any reserved shares that are not so purchased will be offered by the underwriters to the general public on the same basis as the other shares offered by this prospectus. The shares sold in our directed share program will be subject to the 180-day lock-up restriction in the lock-up agreements described above.

Selling Restrictions

European Economic Area

        In relation to each Member State of the European Economic Area that has implemented the Prospectus Directive (each, a Relevant Member State), an offer to the public of any shares of our common stock may not be made in that Relevant Member State, except that an offer to the public in that Relevant Member State of any shares of our common stock may be made at any time under the following exemptions under the Prospectus Directive, if they have been implemented in that Relevant Member State:

•

to any legal entity which is a qualified investor as defined in the Prospectus Directive;



•

to fewer than 100 or, if the Relevant Member State has implemented the relevant provision of the 2010 PD Amending Directive, 150, natural or legal persons (other than qualified investors as defined in the Prospectus Directive), as permitted under the Prospectus Directive, subject to obtaining the prior consent of the representatives for any such offer; or



•

in any other circumstances falling within Article 3(2) of the Prospectus Directive, provided that no such offer of shares of our common stock shall result in a requirement for the publication by us or any underwriter of a prospectus pursuant to Article 3 of the Prospectus Directive.

        For the purposes of this provision, (1) the expression an "offer to the public" in relation to any shares of our common stock in any Relevant Member State means the communication in any form and by any means of sufficient information on the terms of the offer and any shares of our common stock to be offered so as to enable an investor to decide to purchase any shares of our common stock, as the same may be varied in that Member State by any measure implementing the Prospectus Directive in that Member State, (2) the expression "Prospectus Directive" means Directive 2003/71/EC (and amendments thereto, including the 2010 PD Amending Directive, to the extent implemented in the Relevant Member State), and includes any relevant implementing measure in the Relevant Member State, and (3) the expression "2010 PD Amending Directive" means Directive 2010/73/EU.

United Kingdom

        Each underwriter has represented and agreed that:

•

it has only communicated or caused to be communicated and will only communicate or cause to be communicated an invitation or inducement to engage in investment activity (within the meaning of Section 21 of the Financial Services and Markets Act 2000 (FSMA)) received by it in connection with the issue or sale of the shares of our common stock in circumstances in which Section 21(1) of the FSMA does not apply to us; and



•

it has complied and will comply with all applicable provisions of the FSMA with respect to anything done by it in relation to the shares of our common stock in, from, or otherwise involving the United Kingdom.

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LEGAL MATTERS

        Certain legal matters with respect to the validity of the shares of common stock offered hereby will be passed upon for us by Morgan, Lewis & Bockius LLP, New York, New York. Certain legal matters related to this offering will be passed upon for the underwriters by Orrick, Herrington & Sutcliffe LLP, New York, New York.

EXPERTS

        The consolidated financial statements of Axsome Therapeutics, Inc. at December 31, 2014 and 2013, and for each of the two years in the period ended December 31, 2014, appearing in this prospectus and registration statement have been audited by Ernst & Young LLP, independent registered public accounting firm, as set forth in their report thereon appearing elsewhere herein, and are included in reliance upon such report given on the authority of such firm as experts in accounting and auditing.

WHERE YOU CAN FIND MORE INFORMATION

        We have filed with the SEC a registration statement on Form S-1 under the Securities Act with respect to the shares of our common stock offered in this prospectus. This prospectus does not contain all of the information set forth in the registration statement and the accompanying exhibits and schedules. Some items included in the registration statement are omitted from this prospectus in accordance with the rules and regulations of the SEC. For further information with respect to us and the common stock offered in this prospectus, we refer you to the registration statement and the accompanying exhibits and schedules. Statements contained in this prospectus as to the contents of any contract, agreement, or any other document are summaries of the material terms of that contract, agreement, or other document. With respect to each of these contracts, agreements or other documents filed as an exhibit to the registration statement, reference is made to such exhibit for a more complete description of the matter involved. A copy of the registration statement, and the accompanying exhibits and schedules, may be inspected without charge and copied at the SEC's public reference room at 100 F Street, N.E., Washington, D.C. 20549. Please call the SEC at 1-800-SEC-0330 for further information on the operation of the public reference room. The SEC maintains a web site that contains reports, proxy and information statements and other information regarding registrants that file electronically with the SEC. The address of the SEC's website is www.sec.gov.

        Upon completion of this offering, we will become subject to the information and periodic reporting requirements of the Exchange Act, and we will file periodic reports, proxy statements, and other information with the SEC. These periodic reports, proxy statements, and other information will be available for inspection and copying at the public reference room and website of the SEC referred to above. We maintain a website at www.axsome.com. You may access our annual reports on Form 10-K, quarterly reports on Form 10-Q, current reports on Form 8-K and amendments to those reports filed or furnished pursuant to Section 13(a) or 15(d) of the Exchange Act with the SEC free of charge at our website as soon as reasonably practicable after such material is electronically filed with, or furnished to, the SEC. The information contained in, or that can be accessed through, our website is not part of this prospectus.

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Axsome Therapeutics, Inc.
Index to Consolidated Financial Statements

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Report of Independent Registered Public Accounting Firm

The Board of Directors and Stockholders
Axsome Therapeutics, Inc.

        We have audited the accompanying consolidated balance sheets of Axsome Therapeutics, Inc. (the "Company") as of December 31, 2013 and 2014, and the related consolidated statements of operations, stockholders' deficit and cash flows for each of the two years in the period ended December 31, 2014. These financial statements are the responsibility of the Company's management. Our responsibility is to express an opinion on these financial statements based on our audits.

        We conducted our audits in accordance with the standards of the Public Company Accounting Oversight Board (United States). Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements are free of material misstatement. We were not engaged to perform an audit of the Company's internal control over financial reporting. Our audits included consideration of internal control over financial reporting as a basis for designing audit procedures that are appropriate in the circumstances, but not for the purpose of expressing an opinion on the effectiveness of the Company's internal control over financial reporting. Accordingly, we express no such opinion. An audit also includes examining, on a test basis, evidence supporting the amounts and disclosures in the financial statements, assessing the accounting principles used and significant estimates made by management, and evaluating the overall financial statement presentation. We believe that our audits provide a reasonable basis for our opinion.

        In our opinion, the financial statements referred to above present fairly, in all material respects, the consolidated financial position of Axsome Therapeutics, Inc. at December 31, 2013 and 2014, and the consolidated results of its operations and its cash flows for each of the two years in the period ended December 31, 2014, in conformity with U.S generally accepted accounting principles.

/s/ Ernst & Young LLP


New York, New York
August 25, 2015

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Axsome Therapeutics, Inc.
Consolidated Balance Sheets

   

The accompanying notes are an integral part of the consolidated financial statements.

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Axsome Therapeutics, Inc.
Consolidated Statements of Operations

   

The accompanying notes are an integral part of the consolidated financial statements.

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Axsome Therapeutics, Inc.
Consolidated Statements of Stockholders' Deficit

   

The accompanying notes are an integral part of the consolidated financial statements.

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Axsome Therapeutics, Inc.

Consolidated Statements of Cash Flows

   

The accompanying notes are an integral part of the consolidated financial statements.

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Axsome Therapeutics, Inc.
Notes to Consolidated Financial Statements
(Information as of June 30, 2015 and for the six months ended
June 30, 2014 and 2015 is unaudited)

1.     Nature of Business and Basis of Presentation

        Axsome Therapeutics, Inc. ("Axsome" or the "Company") is a clinical stage biopharmaceutical company developing novel therapies for the management of pain and other central nervous system, or CNS, disorders. By focusing on this therapeutic area, the Company is addressing significant and growing markets where current treatment options are limited or inadequate. The Company's product candidate portfolio includes two late-stage candidates, AXS-02 and AXS-05, which are being developed for multiple indications. The Company aims to become a fully integrated biopharmaceutical company that develops and commercializes differentiated therapies that expand the treatment options available to caregivers and improve the lives of patients living with pain and other CNS disorders. The Company was incorporated on January 12, 2012 in the State of Delaware.

        The accompanying consolidated financial statements have been prepared in conformity with accounting principles generally accepted in the United States of America ("GAAP") and include all adjustments necessary for the fair presentation of the Company's financial position for the periods presented. The consolidated financial statements include the accounts of the Company and its wholly owned subsidiaries. All material intercompany accounts and transactions have been eliminated during the consolidation process.

Unaudited Interim Results

        The accompanying consolidated balance sheet as of June 30, 2015, the consolidated statements of operations and consolidated cash flows for the six months ended June 30, 2014 and June 30, 2015 and the consolidated statement of stockholders' deficit for the six months ended June 30, 2015 are unaudited. The unaudited consolidated interim financial statements have been prepared on the same basis as the annual consolidated financial statements and in the opinion of management reflect all adjustments, which include only normal recurring adjustments, necessary to present fairly the Company's financial position and results of operations and cash flows for the periods presented. The financial data and other information disclosed in these notes to the consolidated financial statements related to the six months are unaudited. The results for the six months ended June 30, 2015 are not necessarily indicative of the results to be expected for the year ending December 31, 2015 or for any other interim period or for any other future year.

Unaudited Pro Forma Information

        Unaudited pro forma net loss per share is computed using the weighted average number of common shares outstanding and gives effect to the automatic conversion of all outstanding convertible notes and any accrued and unpaid interest thereon on an as-if converted basis at the later of the beginning of the period or the issuance date, into an aggregate of 134,487 and 304,269 shares of the Company's common stock as of December 31, 2014 and June 30, 2015, respectively. The pro forma net loss per share calculation excludes the following items related to the 2014 convertible notes: interest expense and accumulated amortization, change in fair value of warrant liability, and change in fair value of embedded derivative liabilities.

        The unaudited pro forma balance sheet information as of June 30, 2015 has been prepared to give effect to (1) the automatic conversion of all the Company's outstanding convertible notes, together with any accrued and unpaid interest thereon, into an aggregate of            shares of the Company's common stock upon the closing of this offering, (2) in conjunction with the conversion of the Company's convertible notes: (i) the accelerated amortization of $            of unamortized debt discount and

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$            of unamortized debt issuance costs and (ii) the reclassification of warrant and embedded derivative liabilities to additional paid-in capital as, upon the closing of this offering, neither is subject to remeasurement.

2.     Liquidity

        The Company has not generated any revenues since its inception and has never achieved profitable operations. There is no assurance that profitable operations, if ever achieved, could be sustained on a continuing basis. In addition, development activities, clinical and preclinical testing, and commercialization of the Company's product candidates, if approved, will require significant additional financing. The Company's accumulated deficit at December 31, 2014 and June 30, 2015 aggregated $8.2 million and $12.5 million, respectively, and management expects to incur substantial and increasing losses in future periods. The success of the Company is subject to certain risks and uncertainties, including among others, uncertainty of product candidate development and commercialization, competition in the Company's field of use, protection of proprietary technology, compliance with the U.S. Food and Drug Administration ("FDA") and other government regulations, ability to raise additional financing, uncertainty of the Company's ability to enter into agreements with collaborative partners, dependence on third parties, and dependence on key personnel. The Company plans to finance future operations with a combination of proceeds from the issuance of convertible notes, preferred and/or common stock, potential licensing fees, and revenues from future product sales, if any. The Company has not generated positive cash flows from operations, and there are no assurances that the Company will be successful in obtaining an adequate level of financing for the development and commercialization of its planned products. Management believes that the Company's cash as of June 30, 2015 will provide for the Company to continue operations for at least the next six months. Should the Company's proposed initial public offering ("IPO") not close as planned, management intends to reduce its future spending level to preserve cash and continue its operations on a limited basis until more funding is secured.

3.     Summary of Significant Accounting Policies

Significant Risks and Uncertainties

        The Company's operations are subject to a number of factors that can affect its operating results and financial condition. Such factors include, but are not limited to: the results of clinical testing and trial activities of the Company's product candidates; the Company's ability to obtain regulatory approval to market its products, if approved; competition from products manufactured and sold or being developed by other companies; the price of, and demand for, Company products, if approved; the Company's ability to negotiate favorable licensing or other manufacturing and marketing agreements for its products, if approved; and the Company's ability to raise additional financing. If the Company does not successfully commercialize any of its product candidates, it will be unable to generate recurring product revenue or achieve and maintain profitability.

Use of Estimates

        Management considers many factors in developing the estimates and assumptions that are used in the preparation of these financial statements. Management must apply significant judgment in this process. In addition, other factors may affect estimates, including expected business and operational changes, sensitivity and volatility associated with the assumptions used in developing estimates, and whether historical trends are expected to be representative of future trends. The estimation process often may yield a range of potentially reasonable estimates of the ultimate future outcomes and management must select an amount that falls within that range of reasonable estimates. This process may result in actual results differing materially from those estimated amounts used in the preparation of the financial statements if these results differ from historical experience, or other assumptions do not turn out to be substantially accurate, even if such assumptions are reasonable when made. In preparing

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these financial statements, management used significant estimates in the following areas, among others: stock-based compensation expense; the determination of the fair value of stock-based awards and the warrant and embedded derivative liabilities; the accounting for research and development costs; and the recoverability of the Company's net deferred tax assets and related valuation allowance.

        The Company utilizes significant estimates and assumptions in determining the fair value of its common stock and convertible notes. The Board determined the estimated fair value of the Company's common stock based on a number of objective and subjective factors, including external market conditions affecting the biotechnology industry, the prices at which the Company issued convertible notes, and the likelihood of achieving a liquidity event, such as an IPO or sale of the Company.

Segment and Geographic Information

        Operating segments are defined as components of an enterprise which separate discrete information is available for evaluation by the chief operating decision maker or decision making group, in deciding how to allocate resources and in assessing performance. The Company views its operations and manages its business as one operating segment, which is the business of developing novel therapies for the management of pain and other central nervous system disorders.

Cash Equivalents

        The Company considers all highly-liquid investments that have maturities of three months or less when acquired to be cash equivalents. Cash equivalents are valued at cost, which approximates their fair value. There were no cash equivalents at December 31, 2013 and 2014 or June 30, 2015.

Concentration of Credit Risk

        Financial instruments that potentially subject the Company to a concentration of credit risk consist of cash. The Company maintains its cash at financial institutions, which at times, exceed federally insured limits. At December 31, 2013 and 2014 and June 30, 2015, the Company's cash was held by one financial institution and the amount on deposit was in excess of FDIC insurance limits. The Company has not recognized any losses from credit risks on such accounts since inception. The Company believes it is not exposed to significant credit risk on cash.

Fair Value of Financial Instruments

        Fair value is defined as the exchange price that would be received for an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants at the measurement date. Assets and liabilities that are measured at fair value are reported using a three-level fair value hierarchy that prioritizes the inputs used to measure fair value. This hierarchy maximizes the use of observable inputs and minimizes the use of unobservable inputs. The three levels of inputs used to measure fair value are as follows:

        Level 1—Quoted prices in active markets for identical assets or liabilities that the Company has the ability to access at the measurement date.

        Level 2—Inputs other than quoted prices in active markets that are observable for the asset or liability, either directly or indirectly.

        Level 3—Inputs that are unobservable for the asset or liability.

        To the extent that valuation is based on models or inputs that are less observable or unobservable in the market, the determination of fair value requires more judgment. Accordingly, the degree of judgment exercised by the Company in determining fair value is greatest for instruments categorized in Level 3. A financial instrument's level within the fair value hierarchy is based on the lowest level of any input that is significant to the fair value measurement.

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        The carrying amounts reported in the accompanying consolidated financial statements for loan from related party, accounts payable and accrued expenses approximate their respective fair values due to their short-term maturities. The fair value of the warrant and embedded derivative liabilities are discussed in Note 4, "Fair Value Measurements." The fair value of the convertible notes as of December 31, 2014 and June 30, 2015 was $5,455,000 and $13,123,000, respectively, which were calculated using Level 3 inputs.

Deferred Financing Fees

        The Company capitalizes certain legal, accounting, and other third-party fees that are directly associated with the Company's equity financing to deferred financing fees. Upon consummation of the financing, the fees are reclassified to additional paid-in capital as an offset of the proceeds.

Debt Issuance Costs

        The Company incurred third-party costs, which include the issuance of warrants, in connection with certain issuances of convertible notes as described in Note 7. These costs are classified on the consolidated balance sheet as a direct deduction from the debt liability.

Equipment

        Equipment consists of computer equipment and is recorded at cost. Equipment is depreciated on a straight-line basis over its estimated useful life, which the Company estimates to be three years. When equipment is sold or otherwise disposed of, the cost and related accumulated depreciation are removed from the accounts and the resulting gain or loss is included in operating expenses.

Research and Development Costs

        Research and development expenses primarily consist of costs incurred in performing research and development activities, including preclinical studies, clinical trials, manufacturing costs, employee salaries and benefits, stock-based compensation expense, contract services, including external research and development expenses incurred under arrangements with third parties, such as contract research organizations ("CROs"), facilities costs, overhead costs, depreciation and other related costs.

        Research and development costs are expensed as incurred. Advance payments for goods or services for future research and development activities are deferred and expensed as the goods are delivered or the related services are performed. As part of the process of preparing its financial statements, the Company is required to estimate its accrued expenses. This process involves reviewing quotations and contracts, identifying services that have been performed on the Company's behalf and estimating the level of service performed and the associated cost incurred for the service when the Company has not yet been invoiced or otherwise notified of the actual cost. The majority of the Company's service providers invoice monthly in arrears for services performed or when contractual milestones are met. The Company makes estimates of its accrued expenses as of each balance sheet date in its financial statements based on facts and circumstances known at that time. The Company periodically confirms the accuracy of its estimates with the service providers and makes adjustments if necessary. The significant estimates in accrued research and development expenses are related to fees paid or payable to CROs and other vendors in connection with research and development activities for which the Company has not yet been invoiced.

        The Company bases its expenses related to CROs on its estimates of the services received and efforts expended pursuant to quotes and contracts with CROs that conduct research and development on its behalf. The financial terms of these agreements are subject to negotiation, vary from contract to contract and may result in uneven payment flows. There may be instances in which payments made to vendors will exceed the level of services provided and result in a prepayment of the research and development expense. In accruing service fees, the Company estimates the time period over which

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services will be performed and the level of effort to be expended in each period. If the actual timing of the performance of services or the level of effort varies from its estimate, the Company adjusts the accrual or prepayment accordingly in the period in which the facts that give rise to the revision become known. Although the Company does not expect its estimates to be materially different from amounts actually incurred, the Company's understanding of the status and timing of services performed relative to the actual status and timing of services performed may vary and could result in reporting amounts that are too high or too low in any particular period.

Income Taxes

        Income taxes are accounted for under the asset and liability method. Under this method, deferred tax assets and liabilities are recognized for the future tax consequences attributable to the differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax bases, operating losses and tax credit carryforwards. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled. The effect on deferred tax assets and liabilities of a change in tax rates is recognized in income in the period that includes the enactment date. Valuation allowances are provided if, based upon the weight of available evidence, it is more likely than not that some or all of the deferred tax assets will not be realized.

        The Company recognizes the tax benefit from an uncertain tax position only if it is more likely than not to be sustained upon examination based on the technical merits of the position as well as consideration of the available facts and circumstances. When uncertain tax positions exist, the Company recognizes the tax benefit of tax positions to the extent that the benefit will more likely than not be realized. As of December 31, 2013 and 2014, and as of June 30, 2015, the Company does not believe any material uncertain tax positions are present. In the event the Company determines that accrual of interest or penalties are necessary in the future, the amount will be presented as a component of income tax expense.

Stock-Based Compensation

        The Company accounts for stock-based compensation in accordance with the provisions of ASC Topic 718, Compensation-Stock Compensation ("ASC 718"), which requires the recognition of expense related to the fair value of stock-based compensation awards in the consolidated statement of operations. For stock options issued to employees and members of the Company's board of directors for their services, the Company estimates the grant date fair value of each option using the Black-Scholes option pricing model. The use of the Black-Scholes option pricing model requires management to make assumptions with respect to the expected term of the option, the expected volatility of the common stock consistent with the expected term of the option, risk-free interest rates, the value of the common stock and expected dividend yield of the common stock. For awards subject to service-based vesting conditions, the Company recognizes stock-based compensation expense on a straight-line basis over the requisite service period, which is generally the vesting term. For awards subject to performance-based vesting conditions, the Company recognizes stock-based compensation expense using the accelerated attribution method when it is probable that the performance condition will be achieved. Forfeitures are required to be estimated at the time of grant and revised, if necessary, in subsequent periods if actual forfeitures differ from those estimates.

        For stock-based payments issued to non-employees, compensation expense is determined at the "measurement date," which is the earlier of (i) the date at which a commitment for performance by the counterparty to earn the equity instrument is reached or (ii) the date at which the counterparty's performance is complete. The expense is recognized over the vesting period of the award. Until the measurement date is reached, the total amount of compensation expense remains uncertain. The Company records compensation expense based on the fair value of the award at the reporting date. The awards to non-employees are then revalued, or the total compensation is recalculated based on the then current fair value, at each subsequent reporting date.

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Basic and Diluted Net Loss per Common Share

        Basic net loss per share of common stock is computed by dividing net loss by the weighted average number of shares of common stock outstanding during the period. Diluted net loss per share of common stock includes the effect, if any, from the potential exercise or conversion of securities, such as convertible notes, warrants, and stock options, which would result in the issuance of incremental shares of common stock. As the impact of these items is anti-dilutive during periods of net loss, there was no difference between basic and diluted net loss per share of common stock for the years ended December 31, 2013 and 2014 or the periods ended June 30, 2014 and 2015.

Recent Accounting Pronouncements

        In April 2015, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Updates ("ASU") 2015-03, Interest—Imputation of Interest (Subtopic 835-30). The update requires debt issuance costs related to a recognized debt liability to be presented in the balance sheet as a direct deduction from the debt liability rather than as an asset. The guidance is effective for fiscal years beginning after December 15, 2015. The Company early adopted this guidance for all periods presented.

        In August 2014, the FASB issued ASU 2014-15, Presentation of Financial Statements—Going Concern (Subtopic 205-40), which requires management of an entity to evaluate whether there are conditions or events, considered in the aggregate, that raise substantial doubt about the entity's ability to continue as a going concern within one year after the date that the financial statements are issued or available to be issued. The guidance is effective for fiscal years ending after December 15, 2016. Early adoption is permitted. The Company expects to adopt this guidance when effective and is currently evaluating the effect that the updated standard will have on its financial statements and related disclosures.

        On June 10, 2014, the FASB issued ASU 2014-10, Development Stage Entities (Topic 915). The update removes the definition of a development stage entity from FASB ASC 915 and eliminates the requirement for development stage entities to present inception-to-date information on the statements of operations, cash flows and stockholders' deficit. The Company early adopted this guidance in this and all subsequent reporting periods.

4.     Fair Value Measurements

        The Company considers its warrant and embedded derivative liabilities as Level 3 fair value measurements. The valuation of these liabilities therefore requires inputs that reflect the Company's own assumptions that are both significant to the fair value measurement and unobservable.

        On the grant date and in subsequent periods, the Company estimated the fair value of the warrant liability using the Black-Scholes option-pricing model, which requires inputs such as the expected volatility based on comparable public companies, the estimated fair value of the common stock, and the estimated time to liquidity. As of December 31, 2014 and June 30, 2015, the following inputs were used for the warrant liability:

        The fair value of the embedded derivative liabilities related to the Company's outstanding convertible notes was estimated on the grant date and at each reporting period using a probability

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weighted estimated returns method, which incorporated the "with-and-without" method to bifurcate the embedded derivatives. The Company used three different exit scenarios in valuing the embedded derivative liabilities: an initial public offering, a private equity financing, and a liquidation. A Monte Carlo simulation was run for each exit scenario as of December 31, 2014 and June 30, 2015 with the following inputs:

        Changes to these highly subjective Level 3 assumptions can have a significant impact on the fair value of the warrant liability and the embedded derivative liabilities.

        The following table provides the fair value measurements of applicable financial liabilities measured at fair value on a recurring basis as of December 31, 2014 and June 30, 2015:

 

        The following table sets forth a summary of changes in the fair value of Level 3 liabilities for the year ended December 31, 2014 and for the six months ended June 30, 2015:

 

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5.     Net Loss per Common Share

        The following table sets forth the computation of basic and diluted net loss per common share:

        The following potentially dilutive securities outstanding at December 31, 2013 and 2014 and June 30, 2014 and 2015 have been excluded from the computation of diluted weighted average shares outstanding, as they would be anti-dilutive:

6.     Accrued Expenses

        At December 31, 2013 and 2014 and June 30, 2015, accrued expenses consisted of the following:

7.     Convertible Notes

        During March 2013, the Company issued a total of $211,000 in convertible notes ("March 2013 Notes") to several investors. The March 2013 Notes accrued interest at an annual rate of 8.0% and were due and payable one year from the date of issuance. The principal and accrued interest were convertible into shares of the Company's common stock at the option of the holder, upon the occurrence of a qualified financing, as defined in the March 2013 Notes, immediately prior to the closing of a change in control event, or on the maturity date. In March 2014, all outstanding March 2013 Notes and related accrued interest were converted into 23,859 shares of common stock at a conversion price of $9.55 per share.

        During the period from June through October 2013, the Company issued a total of $3,904,000 in convertible notes to several investors ("June 2013 Notes"). The June 2013 Notes accrued interest at an

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annual rate of 8.0% and were due and payable one year from the date of issuance. The principal and accrued interest were convertible into shares of the Company's common stock at the option of the holder, or upon the occurrence of a qualified financing, as defined in the June 2013 Notes, in which the conversion price would be equal to the lesser of (i) 90% of the lowest price per share at which the Company's shares of equity securities were sold or (ii) $9.55, as adjusted for capitalization change. The Company recorded an initial discount on the June 2013 Notes of $339,735 for fees paid directly to the placement agent.

        In June 2014, the Company and the holders of the June 2013 Notes amended the June 2013 Notes pursuant to which the June 2013 Notes and any accrued and unpaid interest would convert into shares of the Company's common stock on the due date at a conversion price of $9.55 (see further discussions in "—Accounting Analysis" below). In accordance with this amendment, during the period from June 2014 through October 2014, all of the outstanding balance of the June 2013 Notes and accrued and unpaid interest converted into 441,470 shares of common stock.

        During the period from September 2014 through November 2014, the Company issued a total of $4,140,000 in convertible notes to several investors ("September 2014 Notes"). The September 2014 Notes accrue interest at an annual rate of 8.0% and will become due and payable ten years from the date of issuance. The principal and accrued interest are convertible into shares of the Company's common stock at the option of the holder ("Optional Conversion"), or upon the occurrence of an equity financing of at least $2.0 million in gross aggregate cash proceeds, in which the conversion price would be equal to the lesser of (i) 75% of the lowest price per share at which the Company's shares of equity securities are sold (see further discussions in "—Accounting Analysis" below) or (ii) $39.67, as adjusted for capitalization change. Upon a sale or liquidation of the Company at a per share price greater than or equal to the fixed conversion price of $39.67, the September 2014 Notes will automatically convert into common stock of the Company immediately prior to the sale or liquidation at the fixed conversion price of $39.67 per share. Upon a sale or liquidation of the Company at a per share price less than the fixed conversion price of $39.67, the Company will provide five days' notice during which the holder may exercise the Optional Conversion. If the Optional Conversion is not exercised, the Company will prepay the September 2014 Notes upon consummation of the sale or liquidation. The Company recorded an initial discount on the September 2014 Notes of $244,807 for fees paid directly to the placement agent.

        In December 2014 through January 2015, the Company issued a total of $1,570,000 in convertible notes to several investors ("December 2014 Notes"). The December 2014 Notes accrue interest at an annual rate of 8.0% and will become due and payable ten years from the date of issuance. The principal and accrued interest are convertible into shares of the Company's common stock at the option of the holder, or upon the occurrence of an equity financing of at least $2.0 million in gross aggregate cash proceeds, in which the conversion price would be equal to the lesser of (i) 75% of the lowest price per share at which the Company's shares of equity securities are sold (see further discussions in "—Accounting Analysis" below) or (ii) $43.63, as adjusted for capitalization change. Upon a sale or liquidation of the Company at a per share price greater than or equal to the fixed conversion price of $43.63, the December 2014 Notes will automatically convert into common stock of the Company immediately prior to the sale or liquidation at the fixed conversion price of $43.63 per share. Upon a sale or liquidation of the Company at a per share price less than the fixed conversion price of $43.63, the Company will provide five days' notice during which the holder may exercise the Optional Conversion. If the Optional Conversion is not exercised, the Company will prepay the December 2014 Notes upon consummation of the sale or liquidation. The Company recorded no initial discount on the December 2014 Notes.

        During May through July 2015, the Company issued a total of $7,166,469 in convertible notes ("2015 Notes"). The Company issued $7,066,469 of the 2015 Notes prior to June 30, 2015, and $100,000 was issued in July 2015. The 2015 Notes accrue interest at an annual rate of 8.0% and will

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become due and payable ten years from the date of issuance. The principal and accrued interest are convertible into shares of the Company's common stock at the option of the holder, or upon the occurrence of an equity financing of at least $2.0 million in gross aggregate cash proceeds, in which the conversion price would be equal to the lesser of (i) 75% of the lowest price per share at which the Company's shares of equity securities are sold (see further discussions in "—Accounting Analysis" below) or (ii) $43.63, as adjusted for capitalization change. Upon a sale or liquidation of the Company at a per share price greater than or equal to the fixed conversion price of $43.63, the 2015 Notes will automatically convert into common stock of the Company immediately prior to the sale or liquidation at the fixed conversion price of $43.63 per share. Upon a sale or liquidation of the Company at a per share price less than the fixed conversion price of $43.63, the Company will provide five days' notice during which the holder may exercise the Optional Conversion. If the Optional Conversion is not exercised, the Company will prepay the 2015 Notes upon consummation of the sale or liquidation. The Company recorded no initial discount on the 2015 Notes.

Accounting Analysis

        The June 2014 amendment of the June 2013 Notes, pursuant to which the June 2013 Notes plus any accrued and unpaid interest automatically converted into shares of the Company's common stock on the due date, was considered substantive. As such, the June 2013 Notes were considered extinguished, and the amended notes were recorded at fair value. The difference between the fair value of the amended notes of $6,691,000, which was measured using the backsolve method, and the carrying value of the extinguished notes of $3,820,097 was recorded as a loss on extinguishment of debt in the Company's consolidated financial statements. The difference between the fair value and the face value of the amended notes was recorded as a premium to the notes and amortized over the remaining life of the notes. The amortization of the premium is included in interest and amortization of debt discount/premium (expense) income in the consolidated statement of operations.

        The September 2014 Notes, December 2014 Notes, and 2015 Notes each include a redemption provision, which is an embedded derivative. These embedded derivatives required bifurcation from the host debt instrument. The Company aggregated these bifurcated features and reflected the values of these embedded derivatives in the account "embedded derivative liabilities" that will be re-measured at each reporting period and any changes in fair value will be recognized in the consolidated statements of operations. See Note 4, "Fair Value Measurements."

        As of December 31, 2013 and 2014 and June 30, 2015, the convertible notes consisted of the following:

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(1)

Includes the estimated fair value of the warrants issued to the placement agent of the convertible notes and the bifurcated embedded derivative features of the convertible notes at the time of issuance. The Company records interest expense on a quarterly basis. The components of interest expense include (i) accrued interest at the stated 8% rate, (ii) the amortization of the debt discount/premium, and (iii) the amortization of the debt issuance costs.

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Placement Agent Warrants

        In connection with the issuance of the June 2013 Notes, the placement agent received warrants to purchase 31,372 shares of the Company's common stock with an exercise price of $9.55 per share. The Company classified these warrants as equity in the consolidated financial statements since they did not meet the requirements to be included as a liability. The initial fair value of the warrants was $145,565, which was recorded as a discount to the notes and amortized over the term of the June 2013 Notes.

        In connection with the issuance of the September 2014 Notes, the placement agent received warrants to purchase 5,727 shares of the Company's common stock with an exercise price of $43.64 per share. The Company has classified these warrants as a liability in the consolidated financial statements, as upon a qualified financing, as defined in the September 2014 Notes, the warrant price will automatically adjust to a 10% premium to the conversion price of the September 2014 Notes in such mandatory conversion. The initial fair value of the warrant liability was $79,129 which was recorded as a discount to the notes and is being amortized over the term of the September 2014 Notes. The warrant liability is being carried at fair value (see Note 4).

8.     Capital Structure

        As of December 31, 2013 and 2014, the Company was authorized to issue 2,000,000 shares of common stock at $0.0001 par value per share. The holders of shares of common stock are entitled to one vote for each share of common stock held at all meetings of stockholders and written actions in lieu of meetings. The holders of shares of common stock are entitled to receive dividends, if and when declared by the board of directors. In April 2015, the Company's board of directors and stockholders approved an increase of the Company's authorized shares of common stock to 3,000,000 shares.

9.     Stock-Based Compensation

Equity Incentive Plans

        The Company adopted its 2013 Equity Compensation Plan (the "Plan") for employees and consultants for the purpose of advancing the interests of the Company's stockholders by enhancing its ability to attract, retain and motivate persons who are expected to make important contributions to the Company. The board of directors is responsible for determining the individuals to receive option grants, the number of options each individual will receive, the option price per share and the vesting period of each option. Upon inception of the Plan, the number of shares of common stock available for grant was 110,000, subject to certain adjustments. On June 29, 2015, the board of directors authorized an increase of the number of shares of common stock available for grant under the Plan to 135,000, subject to certain adjustments.

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Stock Options

        The following table sets forth the activity under the Company's Plan for the years ended December 31, 2013 and 2014 and for the six months ended June 30, 2015:

        At December 31, 2014, there were 67,505 options vested and expected to vest at a weighted average exercise price of $17.22, with a weighted average remaining contractual term of 9.4 years and an aggregate intrinsic value of $1,690,682. Also at December 31, 2014, there were 39,888 options exercisable at a weighted average exercise price of $11.06, with a weighted average remaining contractual term of 9.2 years and an aggregate intrinsic value of $1,244,999.

        The fair value of each stock option grant is estimated on the date of grant using the Black-Scholes option-pricing model. The Company periodically remeasures the fair value of stock-based awards issued to non-employees and records the expense over the requisite service period. The expected term of the Company's stock options has been determined utilizing the "simplified" method as described in the Securities and Exchange Commission's Staff Accounting Bulletin No. 107 relating to stock-based compensation. The simplified method was chosen because the Company has limited historical option exercise experience because the Company was privately-held. The risk-free interest rate is based on the U.S. Treasury yield in effect at the time of grant for a period approximately equal to the expected term of the award. Expected dividend yield is based on the fact that the Company has never paid cash dividends and does not expect to pay any cash dividends in the foreseeable future. Expected volatility is based on historical volatilities of similar entities within the Company's industry which were commensurate with the Company's expected term assumption. The relevant data used to determine the

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value of the stock option grants for the years ended December 31, 2013 and 2014 and the six months ended June 30, 2015 is as follows:

        The weighted average valuation date fair value of options granted was $4.92, $17.54, and $23.09 per option for the years ended December 31, 2013 and 2014 and the six months ended June 30, 2015, respectively. As of June 30, 2015 and December 31, 2014, there was $948,442 and $609,980, respectively, of total unrecognized compensation cost related to non-vested stock options which is expected to be recognized over a weighted average period of 2.6 years and 2.4 years, respectively. These amounts do not include, as of June 30, 2015, 28,609 options outstanding which are performance-based and vest upon the achievement of certain corporate milestones. Stock-based compensation will be measured and recorded if and when it is probable that the milestone will occur.

        Stock-based compensation expense recognized for the years ended December 31, 2013 and 2014 and the six months ended June 30, 2014 and 2015 was as follows:

Performance-Based Awards

        In 2014, the Company issued 35,999 options, with a weighted average exercise price of $9.55, to employees and non-employees that vest upon the completion of certain clinical and regulatory events. For awards granted to employees with performance conditions, no expense will be recognized, and no measurement date can occur, until the occurrence of the event is probable. For awards granted to non-employees, the Company will recognize the lowest aggregate amount within the range of potential values as expense until the measurement date is established. For the year ended December 31, 2014 and the six months ended June 30, 2015, the Company recognized $75,325 and $0, respectively, as expense related to performance-based awards.

10.   Warrants

        As of December 31, 2013, the Company had warrants to purchase 31,372 shares of common stock outstanding with an exercise price of $9.55 per share ("2013 Warrants"). As of December 31, 2014 and June 30, 2015, the Company had the 2013 Warrants outstanding in addition to warrants to purchase 5,727 shares of common stock outstanding with an exercise price of $43.64 per share ("2014 Warrants"), for a total of 37,099 warrants outstanding. The Company has classified the 2014 Warrants as a liability in the consolidated financial statements, as upon a qualified financing, as defined in the September 2014 Notes, the warrant price will automatically adjust to a 10% premium to the conversion price of the September 2014 Notes in such mandatory conversion. The 2013 Warrants were issued in 2013 to the placement agent in connection with the issuance of the June 2013 Notes, and the 2014

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Warrants were issued in 2014 to the placement agent in connection with the issuance of the September 2014 Notes.

        The initial fair value of the outstanding warrants to purchase shares of common stock of the Company were estimated using the Black-Scholes option pricing model with the following assumptions:

11.   License Agreements

        In 2012, the Company entered into three exclusive license agreements with Antecip Bioventures II LLC, or Antecip, an entity owned by Axsome's Chief Executive Officer and Chairman of the Board, Herriot Tabuteau, M.D., in which it was granted exclusive licenses to develop, manufacture and commercialize Antecip's patents and applications related to the development of AXS-02, AXS-05, and AXS-04, a product candidate that is currently in early stage development, anywhere in the world for veterinary and human therapeutic and diagnostic use. Pursuant to the agreements, the Company is required to use commercially reasonable efforts to develop, obtain regulatory approval for and commercialize AXS-02, AXS-05, and AXS-04. Under the terms of the agreements, the Company is required to pay to Antecip a royalty equal to 4.5% for AXS-02, 3.0% for AXS-05, and 1.5% for AXS-04, of net sales of products containing the licensed technology by the Company, its affiliates, or permitted sublicensees. These royalty payments are subject to reduction by an amount up to 50.0% of any required payments to third parties. Unless earlier terminated by a party for cause or by the Company for convenience, the agreements shall remain in effect on a product-by-product and country-by-country basis until the later to occur of (1) the applicable product is no longer covered by a valid claim in that country or (2) 10 years from the first commercial sale of the applicable product in that country. Upon expiration of the agreements with respect to a product in a country, the Company's license grant for that product in that country will become a fully paid-up, royalty-free, perpetual non-exclusive license. If Antecip terminates any of the agreements for cause, or if the Company exercises its right to terminate any of the agreements for convenience, the rights granted to the Company under such terminated agreement will revert to Antecip. To date, the Company has not been required to make any payments to Antecip under any of the license agreements.

12.   Commitments and Contingencies

Operating Leases

        The Company's offices are located in New York, New York. The Company is not currently under a lease agreement. Rent expense incurred during the years ended December 31, 2013 and 2014 and the six months ended June 30, 2014 and 2015 was $20,573, $59,798, $16,928, and $62,900, respectively.

13.   Income Taxes

        As of December 31, 2013 and 2014, the Company had U.S. net operating loss ("NOL") carryforwards of $2.2 million and $6.6 million, respectively, which will expire beginning in 2033. The NOL carryforwards are subject to review and possible adjustment by the Internal Revenue Service and state tax authorities. NOL carryforwards may become subject to an annual limitation in the event of certain cumulative changes in the ownership interest of significant stockholders, as defined under Sections 382 and 383 of the Internal Revenue Code of 1986, as amended, as well as similar state tax

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provisions. This could limit the amount of NOLs that the Company can utilize annually to offset future taxable income or tax liabilities.

        The components of the Company's deferred tax assets are as follows:

        ASC Topic 740, Income Taxes requires a valuation allowance to reduce the deferred tax assets reported if, based on the weight of available evidence, it is more likely than not that some portion or all of the deferred tax assets will not be realized. After consideration of all the evidence, both positive and negative, the Company has recorded a full valuation allowance against its deferred tax assets at December 31, 2013 and 2014 because the Company's management has determined that it is more likely than not that these assets will not be realized. The valuation allowance for deferred tax assets was $982,096 and $3,479,619 as of December 31, 2013 and 2014, respectively.

        A reconciliation of income tax expense (benefit) at the statutory federal income tax rate and income taxes as reflected in the consolidated financial statements is as follows:

        The Company is not currently under examination at the federal or state levels and as of the date of the consolidated financial statements there were no known assessments.

14.   Related Party Transactions

        From March 2013 through June 2015, members of the Company's board of directors, officers, and some family members participated in the Company's issuance of convertible notes for a total investment of $3,371,469. The terms of these convertible notes were identical to the terms of the convertible notes issued to unrelated third parties. See Note 7 for further information regarding the convertible notes. As of June 30, 2015, $100,000 of principal plus interest under these convertible notes issued to these related parties have converted into 11,308 shares of the Company's common stock.

        In April 2012, the Company entered into a three-year consulting agreement with Mark Coleman, M.D., a member of our board of directors, which was subsequently amended in June 2014, to engage Dr. Coleman to provide certain consulting services in connection with the Company's development of pharmaceutical and other therapeutic product candidates. The consulting agreement provided the Company with the ability to compensate Dr. Coleman in cash or options. In March 2013, the Company

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issued to Dr. Coleman an option grant to purchase 2,859 shares of the Company's common stock with an exercise price of $9.55 per share that vested immediately; in June 2014, the Company issued to Dr. Coleman an option grant to purchase 10,471 shares of the Company's common stock with an exercise price of $9.55 per share which are subject to certain performance-based vesting restrictions; and in June 2015, the Company issued to Dr. Coleman an option grant to purchase 4,549 shares of the Company's common stock with an exercise price of $43.63 per share that vested immediately. The Company recorded stock-based compensation expense of $14,066, $0, and $99,234 for the years ended December 31, 2013 and 2014 and the six months ended June 30, 2015, respectively, related to these option grants.

        As of December 31, 2013, the Company had an outstanding loan payable to its Chief Executive Officer and Chairman of the Board in the amount of $62,469 pertaining to payment of startup costs of the Company. The loan carried no interest and was payable on demand. In December 2014, the Company satisfied a portion of the loan payable with a cash payment of $21,000, leaving a balance at December 31, 2014 of $41,469. In June 2015, the Company paid the remaining balance of the loan obligation, which Dr. Tabuteau then reinvested into the Company by purchasing an equivalent amount of 2015 Notes.

        From the Company's inception, Herriot Tabuteau, M.D. has been the Company's founder, Chief Executive Officer, Chairman of the Company's board of directors, and the beneficial owner of more than 5% of the outstanding shares of the Company's common stock. In connection with the formation of the Company, in January 2012, the Company issued to Antecip Capital LLC, an entity controlled by Dr. Tabuteau, an aggregate of 1,000,000 shares of the Company's common stock for nominal consideration.

        The Company is a party to three exclusive license agreements with Antecip Bioventures II LLC, an entity owned by Dr. Tabuteau. See Note 11 for further information regarding the license agreements.

15.   Subsequent Events

        The Company has evaluated subsequent events through August 25, 2015, the date the consolidated financial statements were available for issuance noting the following event:

        During July 2015, the Company issued $100,000 in convertible notes. See Note 7 for further information regarding the convertible notes.

Event (unaudited) subsequent to the date of the independent auditor's report

        In September 2015, the Company and the holders of its outstanding convertible notes amended the terms of the notes to provide that the principal and any accrued and unpaid interest would automatically convert into shares of the Company's common stock upon the occurrence of an equity financing of at least $2.0 million in gross aggregate cash proceeds at a conversion price equal to the applicable fixed conversion price for the notes; provided, however, if the lowest price per share at which the shares of equity securities are sold in such equity financing is less than the applicable fixed conversion price, then the note conversion price will equal 75% of lowest price per share at which the shares of equity securities are sold. The Company is currently evaluating the effect the accounting for the amendment will have on its financial statements and related disclosures. The amendment may result in extinguishment accounting and therefore a non-cash charge to the statement of operations. This evaluation will be completed during the third quarter of 2015.

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            Shares

Common Stock

Ladenburg Thalmann

                    , 2015

   

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PART II
INFORMATION NOT REQUIRED IN PROSPECTUS

Item 13.    Other Expenses of Issuance and Distribution

        The expenses (other than underwriting discounts and commissions) payable in connection with this offering are as follows:

        All expenses are estimated except for the SEC registration fee, the FINRA filing fee and the NASDAQ listing fee.

Item 14.    Indemnification of Directors and Officers

        Section 102(b)(7) of the Delaware General Corporation Law, or DGCL, provides that a Delaware corporation, in its certificate of incorporation, may limit the personal liability of a director to the corporation or its stockholders for monetary damages for breach of fiduciary duties as a director, except for liability for any:

(1)

Transaction from which the director derived an improper personal benefit;



(2)

Act or omission not in good faith or that involved intentional misconduct or a knowing violation of law;



(3)

Unlawful payment of dividends or purchase or redemption of shares; or



(4)

Breach of the director's duty of loyalty to the corporation or its stockholders.

        Section 145(a) of the DGCL provides, in general, that a Delaware corporation may indemnify any person who was or is a party, or is threatened to be made a party, to any threatened, pending or completed action, suit or proceeding, whether civil, criminal, administrative or investigative (other than an action by or in the right of the corporation) because that person is or was a director, officer, employee or agent of the corporation, or is or was serving at the request of the corporation as a director, officer, employee or agent of another corporation or other enterprise. The indemnity may include expenses (including attorneys' fees), judgments, fines and amounts paid in settlement actually and reasonably incurred by the person in connection with such action, so long as the person acted in good faith and in a manner he or she reasonably believed was in or not opposed to the corporation's best interests, and, with respect to any criminal action or proceeding, had no reasonable cause to believe his or her conduct was unlawful.

        Section 145(b) of the DGCL provides, in general, that a Delaware corporation may indemnify any person who was or is a party, or is threatened to be made a party, to any threatened, pending or completed action or suit by or in the right of the corporation to obtain a judgment in its favor because

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the person is or was a director, officer, employee or agent of the corporation, or is or was serving at the request of the corporation as a director, officer, employee or agent of another corporation or other enterprise. The indemnity may include expenses (including attorneys' fees) actually and reasonably incurred by the person in connection with the defense or settlement of such action, so long as the person acted in good faith and in a manner the person reasonably believed was in or not opposed to the corporation's best interests, except that no indemnification shall be permitted without judicial approval if a court has determined that the person is to be liable to the corporation with respect to such claim. Section 145(c) of the DGCL provides that if a present or former director or officer has been successful in defense of any action referred to in Sections 145(a) and (b) of the DGCL, the corporation must indemnify such officer or director against the expenses (including attorneys' fees) he or she actually and reasonably incurred in connection with such action.

        Section 145(g) of the DGCL provides, in general, that a corporation may purchase and maintain insurance on behalf of any person who is or was a director, officer, employee or agent of the corporation, or is or was serving at the request of the corporation as a director, officer, employee or agent of another corporation or other enterprise against any liability asserted against and incurred by such person, in any such capacity, or arising out of his or her status as such, whether or not the corporation could indemnify the person against such liability under Section 145 of the DGCL.

        Our amended and restated certificate of incorporation and our amended and restated bylaws will provide for the indemnification of our directors and officers to the fullest extent permitted under the DGCL.

        We will enter into indemnification agreements with our directors and executive officers. These indemnification agreements may require us, among other things, to indemnify each such director and executive officer for some expenses, including attorneys' fees, judgments, fines and settlement amounts incurred by him in any action or proceeding arising out of his service as one of our directors or executive officers.

        We intend to purchase and maintain a general liability insurance policy that covers certain liabilities of directors and officers of our corporation arising out of claims based on acts or omissions in their capacities as directors or officers.

        We will enter into an underwriting agreement in connection with this offering, which will provide for indemnification in limited circumstances by the underwriters of us, our officers and directors, for certain liabilities, including liabilities arising under the Securities Act of 1933, as amended, or the Securities Act.

Item 15.    Recent Sales of Unregistered Securities

        During the preceding three years, the Registrant has issued the following securities that were not registered under the Securities Act:

(1)

In March 2013, the Registrant issued convertible notes in the aggregate principal amount of $211,000 to investors. These notes, together with accrued interest, converted into 23,859 shares of common stock in March 2014.



(2)

From June to October 2013, the Registrant issued convertible notes in the aggregate principal amount of $3,904,000 to investors pursuant to a note purchase agreement. These notes, together with accrued interest, converted into 441,470 shares of common stock from June to October 2014.



(3)

In October 2013, in connection with the issuance of convertible notes, the Registrant issued warrants to purchase an aggregate of 31,372 shares of common stock as compensation to the

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placement agent for the offering of the notes. The warrants have a 5-year term and an exercise price of $9.55 per share.

(4)

From September to November 2014, the Registrant issued convertible notes in the aggregate principal amount of $4,140,000 to investors pursuant to a note purchase agreement. All of these notes remain outstanding but will automatically convert upon closing of this offering.



(5)

In November 2014, in connection with the issuance of convertible notes, the Registrant issued warrants to purchase an aggregate of 5,727 shares of common stock as compensation to the placement agent for the offering of the notes. The warrants have a 5 year term and an exercise price of $43.64 per share, subject to adjustment in connection with the closing of this offering.



(6)

From December 2014 to January 2015, the Registrant issued convertible notes in the aggregate principal amount of $1,570,000 to investors pursuant to a note purchase agreement. All of these notes remain outstanding but will automatically convert upon closing of this offering.



(7)

From May to July 2015, the Registrant issued convertible notes in the aggregate principal amount of $7,166,469 to investors pursuant to a note purchase agreement. All of these notes remain outstanding but will automatically convert upon closing of this offering.



(8)

On February 27, 2015, and June 5, 2015, the Registrant granted stock options outside of the 2013 Equity Compensation Plan to purchase an aggregate of 874 shares of common stock at an exercise price of $43.63 to a service provider. On September 15, 2015, the Registrant granted stock options outside of the 2013 Equity Compensation Plan to purchase an aggregate of 252 shares of common stock at an exercise price of $42.42 to a service provider.



(9)

From March 22, 2013, to date, the Registrant granted stock options under our 2013 Equity Compensation Plan to purchase an aggregate of 137,156 shares of common stock at a weighted average exercise price of $23.21 per share to officers, directors, employees and consultants, of which options to purchase 8,600 shares of common stock were subsequently forfeited.

        The offers, sales and issuances of the securities described in paragraphs (1), (2), (3), (4), (5), (6), (7), and (8) were deemed to be exempt from registration under the Securities Act in reliance on Section 4(a)(2) (or Regulation D promulgated thereunder), in that the issuance of securities to the accredited investors did not involve a public offering. The recipients of securities in each of these transactions acquired the securities for investment only and not with a view to or for sale in connection with any distribution thereof and appropriate legends were affixed to the securities issued in these transactions. Each of the recipients of securities in these transactions was an accredited investor under Rule 501 of Regulation D. No underwriters were involved in these transactions.

        The offers, sales and issuances of the securities described in paragraph (9) were deemed to be exempt from registration under the Securities Act in reliance on Rule 701 in that the transactions were under compensatory benefit plans and contracts relating to compensation as provided under Rule 701. The recipients of such securities were the employees, directors or bona fide consultants of the Registrant and received the securities under the Registrant's 2013 Equity Compensation Plan. Appropriate legends were affixed to the securities issued in these transactions. Each of the recipients of securities in these transactions had adequate access, through employment, business or other relationships, to information about the Registrant.

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Item 16.    Exhibits and Financial Statement Schedules

(a)

Exhibits:

        See the Exhibit Index attached to this registration statement, which is incorporated by reference herein.

(b)

Financial Statement Schedules

        All information for which provision is made in the applicable accounting regulations of the Securities and Exchange Commission is either included in the consolidated financial statements or is not required under the related instructions or is inapplicable, and therefore has been omitted.

Item 17.    Undertakings.

        The undersigned Registrant hereby undertakes to provide to the underwriters at the closing specified in the Underwriting Agreement, certificates in such denominations and registered in such names as required by the underwriters to permit prompt delivery to each purchaser.

        Insofar as indemnification for liabilities arising under the Securities Act may be permitted to directors, officers and controlling persons of the Registrant pursuant to the provisions described under Item 14 above, or otherwise, the Registrant has been advised that in the opinion of the Securities and Exchange Commission such indemnification is against public policy as expressed in the Securities Act and is, therefore, unenforceable. In the event that a claim for indemnification against such liabilities (other than the payment by the Registrant of expenses incurred or paid by a director, officer or controlling person of the Registrant in the successful defense of any action, suit or proceeding) is asserted by such director, officer or controlling person in connection with the securities being registered, the registrant will, unless in the opinion of its counsel the matter has been settled by controlling precedent, submit to a court of appropriate jurisdiction the question whether such indemnification by it is against public policy as expressed in the Securities Act and will be governed by the final adjudication of such issue.

        The undersigned Registrant hereby undertakes that:

(1)

For purposes of determining any liability under the Securities Act, the information omitted from the form of prospectus filed as part of this registration statement in reliance upon Rule 430A and contained in a form of prospectus filed by the registrant pursuant to Rule 424(b)(1) or (4) or 497(h) under the Securities Act shall be deemed to be part of this registration statement as of the time it was declared effective.



(2)

For the purpose of determining any liability under the Securities Act, each post-effective amendment that contains a form of prospectus shall be deemed to be a new registration statement relating to the securities offered therein, and the offering of such securities at that time shall be deemed to be the initial bona fide offering thereof.

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SIGNATURES

        Pursuant to the requirements of the Securities Act of 1933, the registrant has duly caused this Registration Statement to be signed on its behalf by the undersigned, thereunto duly authorized, in the City of New York, State of New York, on October 13, 2015.

        Each person whose individual signature appears below hereby authorizes and appoints Herriot Tabuteau, M.D. and Constance Ames, and each of them, with full power of substitution and resubstitution and full power to act without the other, as his or her true and lawful attorney in fact and agent to act in his or her name, place and stead and to execute in the name and on behalf of each person, individually and in each capacity stated below, and to file any and all amendments to this Registration Statement, including any and all post effective amendments and amendments thereto, and any registration statement relating to the same offering filed pursuant to Rule 462(b) under the Securities Act of 1933, as amended, and to file the same, with all exhibits thereto, and other documents in connection therewith, with the Securities and Exchange Commission, granting unto said attorneys in fact and agents, and each of them, full power and authority to do and perform each and every act and thing, ratifying and confirming all that said attorneys in fact and agents or any of them or their or his substitute or substitutes may lawfully do or cause to be done by virtue thereof.

        Pursuant to the requirements of the Securities Act of 1933, as amended, this Registration Statement has been signed by the following persons in the capacities and on the dates indicated.

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INDEX OF EXHIBITS

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