The FDA rejected the first psychedelic PTSD treatment less than two years ago. Now it is handing out priority review vouchers for three more — including one for a drug that looks deliberately designed to fix every problem that killed its predecessor.
The agency awarded a Commissioner's National Priority Voucher on April 24 to Transcend Therapeutics for TSND-201, a methylone-based drug — methylone is a serotonin-releasing agent that acts as a neuroplastogen, a class of compounds thought to promote neural remodeling — for PTSD, according to the FDA. The award followed an April 18 executive order directing HHS to accelerate psychedelic treatments. The voucher slashes FDA review time to one or two months from the usual six to ten. Commissioner Makary said the first psychedelic approval could come by the end of summer 2026.
The TSND-201 program was built around the MDMA failure. The FDA rejected Lykos Therapeutics' MDMA-assisted therapy for PTSD in 2024, citing unreported adverse events, no durability data, and selection bias — high rates of prior psychedelic use among trial participants and prescreening failures that skewed the results. TSND-201 addressed each of those gaps directly. In a 65-patient Phase 2 trial called IMPACT-1, the drug showed a 9.64-point improvement over placebo on the CAPS-5, a clinically validated PTSD symptom scale, at day 64 — statistically significant, p=0.011. Unlike MDMA, TSND-201 is non-hallucinogenic. Transcend enrolled only patients with no prior psychedelic experience, directly eliminating the selection-bias problem. The FDA granted TSND-201 Breakthrough Therapy designation in July 2025 and met with the company in September 2025 to confirm the Phase 3 design before patient recruitment began.
The question is whether Phase 3 carries forward the lessons. TSND-201 went into its next trial with more FDA guidance than MDMA ever had — a Special Protocol Agreement process that the agency and Lykos never completed. The voucher is the FDA saying it is watching closely enough to tell the difference.
Otsuka is acquiring Transcend for up to $1.225 billion, expected to close Q2 2026, contingent on approval, according to Psychedelic Alpha. The deal was announced four weeks ago; the regulatory action that makes it meaningful came today.
Compass Pathways also received a voucher on April 24 for its psilocybin — the active compound in magic mushrooms — program for treatment-resistant depression. Its Phase 3 trial met its primary endpoint. Compass aims to be launch-ready by the end of 2026. Usona Institute received a voucher for psilocybin in major depressive disorder and expects to file its NDA on the basis of a single Phase 3 study.
Whether this represents a genuine regulatory learning moment — or a second attempt at the same bet with better talking points — will depend on what the Phase 3 data show.