Psychedelic assisted psychotherapy (2020–2025): a scoping review of clinical evidence, mechanisms, safety, and ethics

Background: Clinical research on psychedelic-assisted therapy (PAT) has expanded substantially in recent years, particularly for post-traumatic stress disorder (PTSD) and depressive disorders. Contemporary studies have generally evaluated psychedelic administration within controlled therapeutic settings that include psychological support, preparation, and integration. However, variability in clinical response and methodological challenges have highlighted the importance of individual, relational, and contextual factors, often described as “set and setting,” in understanding therapeutic outcomes. The role of psychotherapy and the broader therapeutic context therefore remains an important area of investigation.

Objective: This scoping review aimed to map the contemporary evidence on PAT, characterize the clinical and psychotherapeutic approaches used with psilocybin, MDMA, LSD, and DMT, summarize reported clinical and safety findings, and identify methodological, mechanistic, ethical, and implementation considerations across existing protocols.

Methods: A structured search of PubMed, PsycINFO, Scopus, and ClinicalTrials.gov was conducted on 23 February 2026. Sources published or publicly available between January 2020 and November 2025 were eligible. The review included peer-reviewed and relevant non-peer-reviewed sources addressing psychedelic-assisted interventions, including primary clinical studies, reviews, clinical trial registrations, regulatory documents, and other relevant contextual sources. Records were managed using Zotero and screened against predefined Population, Concept, and Context criteria. Findings were synthesized descriptively according to source type and evidence domain.

Results: The mapped evidence was most developed for MDMA-assisted therapy in PTSD and psilocybin-assisted interventions for depressive disorders. Randomized clinical trials reported reductions in PTSD and depressive symptoms following MDMA- and psilocybin-based interventions, respectively, while emerging clinical evidence also investigated LSD-based treatment for generalized anxiety disorder. Evidence for DMT-assisted therapy remained comparatively preliminary, with several available sources consisting of trial registrations or industry-reported information. Across the literature, preparation, supervised psychedelic administration, and integration were common therapeutic components, although the structure and intensity of psychotherapy varied substantially. Functional unblinding, expectancy effects, heterogeneity of psychotherapeutic approaches, and limitations in long-term safety data were recurring concerns. Ethical issues included informed consent during altered states of consciousness, therapist competence and boundaries, cultural considerations, and equitable access.

Conclusion: PAT represents a rapidly developing area of clinical research, but the evidence base remains heterogeneous across compounds, indications, therapeutic models, and levels of evidential maturity. Future research should improve the standardization and reporting of psychotherapeutic interventions, strengthen methods for assessing blinding and expectancy, establish consistent long-term safety monitoring, and develop robust ethical and equity frameworks. Clear distinction between peer-reviewed clinical findings and preliminary or contextual evidence will also be essential as PAT research progresses toward broader clinical implementation.