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Biohaven’s depression drug fails mid-stage trial, shares fall

By Thomson Reuters Dec 24, 2025 | 2:24 PM

By Christy Santhosh

Dec 24 (Reuters) – Biohaven said on Wednesday its experimental depression drug did not meet the main goal of a mid-stage trial, adding to a ‍string of trial and regulatory setbacks for the drugmaker this year.

The company’s shares fell 17% in extended trading and are down more than 70% this year, weighed down by a clinical trial failure in March and the U.S. health regulator’s rejection of its ‌drug troriluzole for a rare neurodegenerative disorder.

Biohaven’s ‌drug, BHV-7000, when tested in patients with major depressive disorder in a six-week trial did not show significant reduction in depressive symptoms compared with placebo as measured by change in the Montgomery Asberg ​Depression Rating Scale.

The company considers the depression subgroup analyses as “hypothesis generating” but does not plan on additional psychiatric ‍clinical trials to keep resources focused ​on key priority areas of immunology, obesity and ​epilepsy in 2026.

RBC Capital Markets analyst Leonid Timashev said the ‍trial miss is “not surprising” given the limited clinical efficacy data to date and MDD being a challenging indication with significant variability and placebo-effects.

The company is also testing BHV-7000 in epilepsy and has previously evaluated it for bipolar disorder where ‍it failed in a mid to late-stage trial earlier this year.

“With the highest risk events now behind us, we think downside ‍may be somewhat ‍capped by the story refocusing on near-term ​updates across higher investor interest and greater probability ​of ⁠success programs such as epilepsy,” Timashev said.

Last ‌month, Biohaven said it would cut annual direct R&D spending by about 60% after the U.S. Food and Drug Administration declined to approve its drug troriluzole for spinocerebellar ataxia, a neurodegenerative disorder that affects movement and balance.

(Reporting by Christy Santhosh in Bengaluru; Editing ⁠by Shailesh Kuber)