Aldeyra Therapeutics announced receipt of a complete response letter (CRL) from the US Food and Drug Administration (FDA) for the new drug application (NDA) of reproxalap, an investigational drug candidate for the treatment of dry eye disease.
According to a company press release, the CRL stated that there is “a lack of substantial evidence consisting of adequate and well-controlled investigations … that the drug product will have the effect it purports or is represented to have under the conditions of use prescribed, recommended, or suggested in its proposed labeling” and that “the application has failed to demonstrate efficacy in adequate and well controlled studies in the treatment of signs and symptoms of dry eye disease.” The letter also stated that the “inconsistency of study results raises serious concerns about the reliability and meaningfulness of the positive findings” and that the “totality of evidence from the completed clinical trials does not support the effectiveness of the product.” Consistent with prior NDA reviews of reproxalap, no safety or manufacturing concerns were identified, the company said in the press release.
During the NDA review, label drafts were provided by the FDA in December 2025 and again in March 2026. Aldeyra said it does not believe that label negotiations were completed.
The FDA recommended that the reasons for failure in certain trials be explored, and that populations or certain conditions in which reproxalap may be effective be identified. The FDA did not recommend conducting additional trials or request submission of additional confirmatory evidence. As such, Aldeyra said it does not currently expect to pursue additional clinical trials, and intends to expeditiously request a Type A meeting to understand the actions needed for NDA approval. Per Prescription Drug User Fee Act (PDUFA) goals, the target Type A meeting date is within 30 days of receipt of the meeting request.
As of December 31, 2025, Aldeyra said it reported cash, cash equivalents, and marketable securities of $70 million, which are expected to support operations into 2028.