Tier 2 — strong

A phase 2, multicenter, double-blind, randomized, placebo-controlled study of the safety and efficacy of forvisirvat (SP-624) in the treatment of adults with major depressive disorder

Joel Raskin, Anita H Clayton, Susan G Kornstein, George I Papakostas, Yuki Prescott, Kelly Abernathy, John Hall, Michael Ackermann, William Wargin, Greg Rigdon, SP-624-201 study investigators
Current Medical Research and Opinion 2025 41(9):1723-1734

Bibliography

PubMed
PMID 41099447
Trial registry
View on ClinicalTrials.gov Registered trial — results not yet published in a peer-reviewed journal.
Funding
Industry-sponsored development program for forvisirvat/SP-624; several authors are affiliated with Sirtsei Pharmaceuticals / Arrivo BioVentures.
Competing interests
The study was funded by Sirtsei Pharmaceuticals, a wholly owned subsidiary of Arrivo BioVentures. Several authors were Sirtsei consultants and held minority equity interests in Arrivo BioVentures; other academic authors reported additional industry relationships detailed in the publication.

Study snapshot

DesignMulticenter Phase 2 double-blind randomized placebo-controlled trial.
ModelAdults with moderate-to-severe major depressive disorder.
Sample319 randomized: 163 forvisirvat and 156 placebo; 317 treated.
InterventionForvisirvat (SP-624) 20 mg orally once daily versus placebo.
Duration4 weeks.
EndpointsChange in MADRS score at Week 4; secondary depression efficacy measures; treatment-emergent adverse events; discontinuations

What the study showed, in plain terms

This Phase 2 trial is the strongest direct human efficacy test of a synthetic SIRT6 activator currently in the corpus. Forvisirvat 20 mg daily did not significantly beat placebo on the prespecified primary depression endpoint overall; a post-hoc signal was reported in women, and no serious adverse events were reported in the treated group.

Key findings

The overall primary endpoint was negative. Post-hoc sex-stratified analyses favored forvisirvat in women but not men, so those subgroup findings require prospective confirmation.

What this study can and cannot tell us

The trial studied major depressive disorder, not aging or longevity. The subgroup efficacy result was post-hoc, treatment lasted four weeks, and the development program has industry involvement.

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