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medRxiv PreprintsInternational29 October 2026

Psilocybin, cognitive stability and drinking reduction in co-occurring alcohol use disorder and depression: a pilot secondary analysis of a randomized, placebo-controlled trial

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Background. Change in cognitive control is a candidate transdiagnostic mechanism of psychedelic therapy. One account predicts that, once acute effects resolve, psilocybin shifts control toward flexibility while sparing inhibition and working memory. A motivational account (PRISM) predicts that psilocybin increases the willingness to exert control rather than the ability to do so. We tested both in patients with co-occurring alcohol use disorder (AUD) and major depression. Methods. In this secondary analysis of a randomized, double-blind, placebo-controlled trial of psilocybin for AUD with como
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