Substance guides
How long do shrooms stay in your system?
Published October 4, 2024 · 6 min read · Updated April 2026
Reviewed for accuracy by licensed clinical professionals.
Psilocybin and its active metabolite psilocin have very short half-lives, making detection difficult and rare.
Detection
Urine: 24-48 hours with specialized testing. Blood: less than 24 hours. Standard drug panels do NOT test for psilocybin. Specialized testing exists but is extremely rare.
Why they are hard to detect
Psilocin has a half-life of approximately 50 minutes. The body eliminates it rapidly. Standard immunoassay tests do not cross-react with psilocybin.
Practical reality
Psilocybin testing is essentially never performed in workplace or standard treatment settings.
Frequently asked questions
Do shrooms show on a drug test?
Not on any standard drug panel. Specialized testing exists but is almost never used.
How long do shrooms stay in urine?
24-48 hours with specialized testing that is rarely performed.
Are shrooms addictive?
Psilocybin does not produce physical dependence. Rapid tolerance development prevents compulsive daily use.
Disclaimer: Informational only. Not medical advice. SAMHSA: 1-800-662-4357.