Aldeyra Therapeutics, Inc., a biotechnology company, develops and commercializes medicines for immune-mediated ocular and systemic diseases. The company's lead product candidate is reproxalap, an ophthalmic solution, which is in Phase III clinical trial for the treatment of dry eye diseases and allergic conjunctivitis. It also develops ADX-2191, a dihydrofolate reductase inhibitor which is in phase 3 for the prevention of proliferative vitreoretinopathy, and phase II clinical trial for the treatment of primary vitreoretinal lymphoma. The company's portfolio also consists of ADX-1612, a small molecule heat shock protein 90 (Hsp90) inhibitor for the treatment of lymphoproliferative diseases and covid-19; and reactive aldehyde species that are pro-inflammatory (RASP) scavengers, such as ADX-629 for treating autoimmune diseases, allergy, and covid-19, as well as ADX-103 for the treatment of retinal diseases. The company was formerly known as Aldexa Therapeutics, Inc. and changed its name to Aldeyra Therapeutics, Inc. in March 2014. Aldeyra Therapeutics, Inc. was incorporated in 2004 and is headquartered in Lexington, Massachusetts.