Lykos reiterated its concerns about the “structure and conduct” of the June advisory committee meeting for its MDMA therapy for post-traumatic stress disorder as it prepares to formally challenge the US Food and Drug Administration’s 9 August complete response letter.
US FDA Advisory Committee Conduct Could Take Center Stage in Lykos Appeal of MDMA Rejection
Sponsor of psychedelic PTSD treatment will try rarely successful formal dispute resolution process after receiving a complete response letter.

More from Complete Response Letters
Organizational turmoil has not yet affected reviews of novel agent applications, with Q1 2025 approvals coming in low, but the first quarter share of the entire year is variable.
While CMC glitches linger over a US NDA for Elevar/Hengrui’s novel liver cancer combination following a second complete response letter, the separate issue of underrepresentation of US patients in multiregional trials is looming large after new FDA draft guidance last year.
Acting Commissioner Sara Brenner rejected the company’s request for a hearing, saying the lack of an adequate and well-controlled trial showing tasimelteon's effectiveness in treating sleep-onset insomnia is “fatal to the application.”
Prospects are promising for many of the 16 novel candidates that received complete response letters in 2024 after half of the 2023 CRL class was approved the following year.
More from Product Reviews
This is an update of recommendations from the European Medicines Agency's Committee for Medicinal Products for Human Use on the authorization of new medicines in the EU, and updates on EU marketing authorization changes recommended by the CHMP.
Sanofi’s Dupixent, Amgen’s Uplizna, and Bristol’s Opdivo seek new indications, while J&J hopes to start a franchise with nipocalimab and Stealth’s day of reckoning approaches.
The European Medicines Agency has recommended five drugs for EU-wide approval , including Averoa’s Xoanacyl for concomitant hyperphosphatemia. Two companies have withdrawn their marketing authorization applications.