Aldeyra Therapeutics Announces First Patient Enrolled in

LEXINGTON, MA--(Marketwired - Feb 7, 2017) - Aldeyra Therapeutics, Inc. ( NASDAQ : ALDX ) (Aldeyra), a biotechnology company focused on the development of products to treat diseases related to aldehydes, today announced that it has enrolled the first patient in a Phase 2b clinical trial of ADX-102 for the treatment of allergic conjunctivitis.

"We are pleased to advance our allergic conjunctivitis program to late-stage clinical testing," commented Todd C. Brady, M.D., Ph.D., President and CEO of Aldeyra Therapeutics. "It is estimated that more than one million allergic conjunctivitis patients in the United States require adjunctive therapy for adequate symptomatic relief. ADX-102 represents a novel mechanistic approach in allergic conjunctivitis that could become a safe and efficacious alternative to anti-histamines and other drugs, such as corticosteroids, which lead to significant side-effects in some patients. We look forward to providing data from this trial in the third quarter of 2017."

A synopsis of the trial is available on www.clinicaltrials.gov (#NCT03012165).

About Allergic Conjunctivitis Allergic conjunctivitis is a common allergic disease that is thought to be mediated in part by pro-inflammatory aldehydes, and is characterized by inflammation of the conjunctiva (a membrane covering part of the front of the eye), resulting in ocular itching, excessive tear production, lid swelling and redness.

About Aldeyra Therapeutics Aldeyra Therapeutics, Inc. is a biotechnology company devoted to improving lives by inventing, developing and commercializing products that treat diseases thought to be related to endogenous aldehydes, a naturally occurring class of pro-inflammatory and toxic molecules. Aldeyra's lead product candidate, ADX-102, is an aldehyde trap in development for ocular inflammation, as well as for Sjögren-Larsson Syndrome and Succinic Semi-Aldehyde Dehydrogenase Deficiency, two inborn errors of aldehyde metabolism. Aldeyra's product candidates have not been approved for sale in the U.S. or elsewhere.

Safe Harbor Statement This release contains forward-looking statements within the meaning of Section 21E of the Securities Exchange Act of 1934, as amended, including but not limited to statements regarding Aldeyra's plans for its product candidates and expected development timelines. In some cases, you can identify forward-looking statements by terms such as "may," "might," "will," "objective," "intend," "should," "could," "can," "would," "expect," "believe," "anticipate," "project," "target," "design," "estimate," "predict," "potential," "aim," "plan" or the negative of these terms, and similar expressions intended to identify forward-looking statements. Such forward-looking statements are based upon current expectations that involve risks, changes in circumstances, assumptions and uncertainties. Aldeyra is at an early stage of development and may not ever have any products that generate significant revenue. Important factors that could cause actual results to differ materially from those reflected in Aldeyra's forward-looking statements include, among others, the timing of enrollment, commencement and completion of Aldeyra's clinical trials, the timing and success of preclinical studies and clinical trials conducted by Aldeyra and its development partners; the ability to obtain and maintain regulatory approval to conduct clinical trials and to commercialize Aldeyra's product candidates, and the labeling for any approved products; the scope, progress, expansion, and costs of developing and commercializing Aldeyra's product candidates; the size and growth of the potential markets for Aldeyra's product candidates and the ability to serve those markets; Aldeyra's expectations regarding Aldeyra's expenses and revenue, the sufficiency of Aldeyra's cash resources and needs for additional financing; the rate and degree of market acceptance of any of Aldeyra's product candidates; Aldeyra's expectations regarding competition; Aldeyra's anticipated growth strategies; Aldeyra's ability to attract or retain key personnel; Aldeyra's ability to establish and maintain development partnerships; Aldeyra's expectations regarding federal, state and foreign regulatory requirements; regulatory developments in the United States and foreign countries; Aldeyra's ability to obtain and maintain intellectual property protection for its product candidates; the anticipated trends and challenges in Aldeyra's business and the market in which it operates; and other risks that are described in the "Risk Factors" and "Management's Discussion and Analysis of Financial Condition and Results of Operations" sections of Aldeyra's Annual Report on Form 10-K for the year ended December 31, 2015, and Aldeyra's Quarterly Report on Form 10-Q for the quarter ended September 30, 2016, which are on file with the SEC and available on the SEC's website at www.sec.gov . Additional factors may be set forth in Aldeyra's Annual Report on Form 10-K for the year ended December 31, 2016, to be filed with the SEC in the first quarter of 2017.

In addition to the risks described above and in Aldeyra's other filings with the SEC, other unknown or unpredictable factors also could affect Aldeyra's results. No forward-looking statements can be guaranteed and actual results may differ materially from such statements. The information in this release is provided only as of the date of this release, and Aldeyra undertakes no obligation to update any forward-looking statements contained in this release on account of new information, future events, or otherwise, except as required by law.