PSYCHEDELIC GUIDES · GUIDE 01
Psilocybin
Psilocybin is the psychoactive compound in "magic mushrooms," converted in the body to psilocin. It acts mainly on serotonin 2A receptors, producing several hours of altered perception, emotion, and sense of self. It has been used ceremonially for centuries and studied clinically since the 1950s; modern research restarted in the 2000s.
This project examines psychedelic research; it does not recommend psychedelic use. Outside approved medical care and registered clinical trials, these substances are illegal in most places, uncontrolled in content and dose, and genuinely dangerous for some people. Nothing in these guides is a how-to. If you are struggling, established treatments exist — and the medication and treatment sections of this site cover many of them.
EVIDENCE REVIEW
OCTOBER 18, 2026
What the research shows
In controlled trials — with screening, preparation, and professionally supported sessions — psilocybin has shown rapid and sometimes durable antidepressant effects, including in treatment-resistant depression, with a first positive Phase 3 trial reported in 2025, and benefits for end-of-life anxiety and some addictions. The FDA has granted it "breakthrough therapy" designations for depression. It is not an approved medicine: trials remain small, blinding is nearly impossible, and long-term comparative data are still thin.
Risks — and who should not take them
Psilocybin has low physiological toxicity, but the psychological risks are real: intense fear or panic during a session, dangerous behavior while impaired, and — most seriously — the possibility of triggering lasting psychosis in people with schizophrenia or another psychotic disorder, or a strong family history of one. That group should not take psychedelics. Interactions matter too: combining serotonergic substances can be dangerous, case reports link psilocybin with lithium to seizures, and MAOIs can intensify and prolong effects unpredictably. Unregulated mushrooms vary enormously in strength, and misidentified wild mushrooms can be poisonous.
Legal status
Psilocybin is a US federal Schedule I substance — illegal to possess outside approved research. A few exceptions are narrow and local: Oregon licenses supervised adult psilocybin service centers, Colorado has a regulated program, and some cities have deprioritized enforcement. State programs are not medical treatment, and they do not make mushrooms legal anywhere else.
