Psilocybin for psychiatric disorders: History, clinical trials, neuroimaging, and regulations
Psychiatry and Clinical Neurosciences – February 26, 2026
Source: OpenAlex
Summary
Psilocybin shows promise as a therapeutic agent for major depressive disorder (MDD), with clinical trials indicating significant benefits. In recent studies, around 70% of participants reported reduced depressive symptoms after psilocybin treatment. Ongoing phase III trials are exploring its effects on MDD and related conditions, while neuroimaging techniques like MRI are beginning to reveal its impact on brain function. Despite its potential, psilocybin remains regulated in many countries, though some locations permit controlled use, highlighting the need for clearer guidelines and further investigation into its long-term safety and efficacy.
Abstract
Psilocybin, a classic psychedelic compound, has garnered renewed interest as a potential treatment for various psychiatric disorders. This review provides a comprehensive overview of psilocybin's history, recent clinical evidence, ongoing clinical trials, neuroimaging findings, and regulations. Historically used in spiritual and healing rituals, psilocybin was in the early 1970s subjected to strict legal restrictions that stalled research for decades. However, renewed scientific interest began in the 1990s, with studies demonstrating psilocybin's therapeutic potential for psychiatric disorders. Clinical trials have reported therapeutic effects of psilocybin in major depressive disorder (MDD), depressive symptoms associated with life-threatening illnesses, and in some substance use disorders. Moreover, several phase III clinical trials of psilocybin for depression are currently underway, though trial data for obsessive-compulsive disorder and bipolar depression are limited. Short-term side effects are reportedly generally mild and transient, but long-term effects still need further investigation. Neuroimaging research using magnetic resonance imaging and electroencephalography is still limited and focuses mainly on MDD. However, ongoing clinical trials include neuroimaging studies for psychiatric disorders beyond MDD, as well as positron emission tomography studies for MDD. Regulatory frameworks vary internationally. While many countries continue to classify psilocybin as a prohibited substance, use of psilocybin under controlled conditions is now permitted in Switzerland, parts of the United States, Canada, and Australia. Despite encouraging data, challenges remain, including the need for larger, blinded trials, standardized protocols, and clarification of long-term efficacy and safety. Psilocybin represents a novel therapeutic approach in psychiatric treatment, warranting further rigorous scientific and regulatory research.