OPEN Foundation

Psilocybin induces schizophrenia‐like psychosis in humans via a serotonin‐2 agonist action

Abstract

Psilocybin, an indoleamine hallucinogen, produces a psychosis-like syndrome in humans that resembles first episodes of schizophrenia. In healthy human volunteers, the psychotomimetic effects of psilocybin were blocked dose-dependently by the serotonin-2A antagonist ketanserin or the atypical antipsychotic risperidone, but were increased by the dopamine antagonist and typical antipsychotic haloperidol. These data are consistent with animal studies and provide the first evidence in humans that psilocybin-induced psychosis is due to serotonin-2A receptor activation, independently of dopamine stimulation. Thus, serotonin-2A overactivity may be involved in the pathophysiology of schizophrenia and serotonin-2A antagonism may contribute to therapeutic effects of antipsychotics.

Vollenweider, F. X., Vollenweider-Scherpenhuyzen, M. F., Bäbler, A., Vogel, H., & Hell, D. (1998). Psilocybin induces schizophrenia‐like psychosis in humans via a serotonin‐2 agonist action. Neuroreport, 9(17), 3897-3902. https://dx.doi.org/doi:10.1097/00001756-199812010-00024
Link to full text

OPEN Foundation

Share This Post

get the latest

The OPEN Minded Newsletter keeps you informed about the latest psychedelic research & news, articles, exclusive events, job opportunities, programmes, and free resources!

By clicking SUBSCRIBE, I confirm to receive emails from the OPEN Foundation and agree with its privacy policy.

interested in becoming a trained psychedelic-assisted therapist?

Q&A with Rachel Harris: Wisdom from the Psychedelic Underground - Online Event - Oct 16th