‘Hallucinogenic mushrooms’ is the name commonly given to psychoactive fungi, containing hallucinogenic compounds, most commonly psilocybin and psilocin. At low doses, hallucinogenic drugs have as their primary effects perceptual distortions and alterations of thought, or mood, with the presence of lucid awareness and minimal effects on memory and orientation. Despite their name, the use of hallucinogenic drugs rarely results in true hallucinations. The hallucinogens are a chemically diverse class. Grouping the hallucinogens based on their chemical structure includes, but is not limited to, three major classes: indolealkylamines or tryptamines (e.g. LSD, psilocybine and psilocin), phenethylamines, including mescaline and methylenedioxymethamphetamine (MDMA); and cannabinoids.