Psychedelics are a hallucinogenic class of psychoactive drug whose primary effect is to trigger non-ordinary states of consciousness and psychedelic experiences via serotonin 2A receptor agonism. This causes specific psychological, visual and auditory changes, and often a substantially altered state of consciousness.

This causes specific psychological, visual and auditory changes, and often a substantially altered state of consciousness. “Classical” psychedelic drugs include mescaline, LSD, psilocybin, and DMT.