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Psilocibin: Current Evidence, Safety Signals, and Challenges in Assessing Potential Multi-Organ Effects
Kasper Buczma1, Katarzyna Kamińska1, Kaja Kasarełło1
1Laboratory of Centre for Preclinical Research, Chair and Department of Physiology and Pathophysiology, Medical University of Warsaw, Banacha 1b, 02-097 Warsaw, Poland.
Biomedicines
|July 28, 2026
Summary
Psilocybin (PSY) shows potential for treating depression, but its safety profile requires further study. Current controlled data do not indicate significant organ toxicity, though some safety signals warrant investigation.
Area of Science:
- Neuroscience
- Pharmacology
- Toxicology
Background:
- Psilocybin (PSY), a psychedelic compound, is gaining attention for its therapeutic potential in conditions like treatment-resistant depression.
- Concerns exist regarding PSY's safety profile, including potential effects on major organs.
Purpose of the Study:
- To systematically review and synthesize existing evidence on potential multi-organ safety signals associated with psilocybin exposure.
- To critically appraise the current state of knowledge regarding PSY's organ-specific toxicity.
Main Methods:
- A narrative review encompassing preclinical studies, pharmacological data, clinical trials, and case reports.
- Inclusion of all available sources addressing toxicological outcomes, irrespective of exposure context.
Main Results:
- The evidence base is limited and heterogeneous, with reported adverse events being rare and often confounded.
- Biologically plausible mechanisms for organ-specific effects exist, but controlled clinical data do not consistently support intrinsic multi-organ toxicity.
- Current controlled data do not show clinically significant intrinsic multi-organ toxicity of psilocybin.
Conclusions:
- Controlled psilocybin administration does not currently confirm clinically meaningful intrinsic multi-organ toxicity.
- Potential safety signals identified in the literature necessitate further systematic research.
- Understanding the organ-specific safety profile of psilocybin is crucial given its increasing clinical interest.
