Psilocybin is a hallucinogenic substance people ingest from certain types of mushroom that grow in regions of Europe, South America, Mexico, and the United States.

The mushrooms containing psilocybin are known as magic mushrooms.

Psilocybin is a schedule-I controlled substance, meaning that it has a high potential for abuse and serves no legitimate medical purpose.

Individuals use psilocybin as a recreational drug. It provides feelings of euphoria and sensory distortion that are common to hallucinogenic drugs, such as LSD.

Although medical bodies do not consider psilocybin to be an addictive substance, users can experience disturbing hallucinations, anxiety, and panic from using the drug.