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The following is a list of psychedelic drugs of various chemical classes, including both naturally occurring and synthetic compounds. Serotonergic psychedelics are usually considered the "classical" psychedelics[dubious – discuss], whereas the other classes are often seen as having only secondary psychedelic properties; nonetheless all of the compounds listed here are considered psychoactive and hallucinogenic in humans to some degree.
Some of these compounds may be classified differently or under more than one category due to a unique structural classification, multiple mechanisms of action, or the fact that the precise pharmacodynamic actions of the compound are not yet completely understood. Because of the vast amount of possible substitutions and chemical analogs of most psychedelic compounds, the total diversity of chemical compounds which produce psychedelic effects in humans is not fully reflected within this list, leaving room for many that have not yet been sufficiently investigated and others that have not yet been discovered.
Naturally occurring compounds are marked with a †.