Control group improvement lower in psilocybin trials for depression
The Brown University Psychopharmacology Update – October 10, 2025
Source: OpenAlex
Summary
Surprisingly, psilocybin's perceived efficacy in treating depression might be overstated. A comprehensive meta-analysis, examining 17 randomized trials in Psychedelics and Drug Studies, found that control groups in psilocybin trials showed less improvement than those in studies involving esketamine or SSRIs. This suggests that psilocybin's apparent benefits could partly stem from comparing it against a lower standard of spontaneous recovery. Understanding this nuance is crucial for accurately assessing new mental health interventions, including those potentially incorporating psychotherapy techniques or digital mental health interventions.
Abstract
A meta‐analysis comprising 17 randomized trials has found that rates of control group improvement in depression studies were lower in psilocybin trials than in studies of esketamine or a selective serotonin reuptake inhibitor (SSRI). The results suggest that psilocybin's overall efficacy in the treatment of depression might be overestimated.