Set and setting of psychedelics for therapeutic use in psychiatry: A systematic review
Journal of Psychopharmacology – May 12, 2025
Source: OpenAlex
Summary
Psychedelics, like psilocybin, show promise in psychiatry, yet how psychological interventions are delivered varies widely. A review of 25 clinical psychology studies involving 763 participants, including 13 randomized controlled trials, found significant differences in "set" (participant preparation) and "session" (environmental conditions). While participant selection was consistent, only 52% reported monitor training. Psilocybin was used in 47% of cases. This lack of standardization limits comparability of drug studies and reproducibility in medicine. Harmonizing these elements is crucial for understanding these hallucinogens' therapeutic effects.
Abstract
Psychedelics offer promising outcomes in psychiatry. However, the preparation of participants (set) and the environmental conditions of taking a psychedelic (setting) are not standardized. We describe the set and setting for therapeutic use of psychedelic drugs in people with psychiatric disorders. In this systematic review, articles were identified in the PubMed and Web of Science databases until 12 December 2023. Only clinical trials published in English or French were eligible, and studies using psychedelics for withdrawal were excluded. Sixteen domains of set and setting were assessed covering participant selection, pre- and post-session interventions, monitor presence, environmental management, and end-of-session procedure. Of 4912 articles screened, 27 articles were retained reporting on 25 studies. Thirteen of the included studies reported randomized trials, while 12 were open-label studies, on a total of 763 participants. Studies considered features of set and setting to different extents. Participant selection and the creation of a safe environment were consistently present, but articles were more heterogeneous about reporting monitor training (52%), controlling visual distractors (64%) and creating a pleasant environment (68%). Psilocybin was over-represented (47%). Many key elements were described in each study, but differences in set and setting limit comparability and reproducibility. Harmonizing these aspects would aid the interpretation of future studies and help understand the effect of psychedelics in psychiatry.