Post-acute psychological effects of classical serotonergic psychedelics: a systematic review and meta-analysis.

Abstract:

BACKGROUND:Scientific interest in the therapeutic effects of classical psychedelics has increased in the past two decades. The psychological effects of these substances outside the period of acute intoxication have not been fully characterized. This study aimed to: (1) quantify the effects of psilocybin, ayahuasca, and lysergic acid diethylamide (LSD) on psychological outcomes in the post-acute period; (2) test moderators of these effects; and (3) evaluate adverse effects and risk of bias. METHODS:We conducted a systematic review and meta-analysis of experimental studies (single-group pre-post or randomized controlled trials) that involved administration of psilocybin, ayahuasca, or LSD to clinical or non-clinical samples and assessed psychological outcomes ⩾24 h post-administration. Effects were summarized by study design, timepoint, and outcome domain. RESULTS:A total of 34 studies (24 unique samples, n = 549, mean longest follow-up = 55.34 weeks) were included. Classical psychedelics showed significant within-group pre-post and between-group placebo-controlled effects on a range of outcomes including targeted symptoms within psychiatric samples, negative and positive affect-related measures, social outcomes, and existential/spiritual outcomes, with large between-group effect in these domains (Hedges' gs = 0.84 to 1.08). Moderator tests suggest some effects may be larger in clinical samples. Evidence of effects on big five personality traits and mindfulness was weak. There was no evidence of post-acute adverse effects. CONCLUSIONS:High risk of bias in several domains, heterogeneity across studies, and indications of publication bias for some models highlight the need for careful, large-scale, placebo-controlled randomized trials.

journal_name

Psychol Med

journal_title

Psychological medicine

authors

Goldberg SB,Shechet B,Nicholas CR,Ng CW,Deole G,Chen Z,Raison CL

doi

10.1017/S003329172000389X

subject

Has Abstract

pub_date

2020-12-01 00:00:00

pages

2655-2666

issue

16

eissn

0033-2917

issn

1469-8978

pii

S003329172000389X

journal_volume

50

pub_type

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