List of Psychedelic Drugs
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Serotonergic psychedelics (serotonin 5-HT2A receptor agonists)
This class of psychedelics includes the major hallucinogens, including the ergolines like LSD and LSA, tryptamine-based compounds like psilocybin and DMT, and phenethylamine-based compounds like mescaline and 2C-B.
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Empathogen-entactogens (serotonin releasers)
The empathogen-entactogens are phenethylamines such as MDMA (Ecstasy), MDA, and MDEA, among others.
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Cannabinoids (CB-1 cannabinoid receptor agonists)
The cannabinoid tetrahydrocannabinol (THC) and related compounds are capable of activating the brain's endocannabinoid system.
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Salvia divinorum is an atypical psychedelic.
http://en.wikipedia.org/wiki/Psychedelic_drug
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A psychedelic substance is a psychoactive drug whose primary action is to alter the cognition and perception of the mind. Psychedelics are part of a wider class of psychoactive drugs known as hallucinogens, which also includes related substances such as dissociatives and deliriants. Unlike other drugs such as stimulants and opioids which induce familiar states of consciousness, psychedelics tend to bend and twist the mind in ways that result in the experience being qualitatively different from those of ordinary consciousness. The psychedelic experience is often compared to non-ordinary forms of consciousness such as trance, meditation, yoga, and dreaming.
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Many pharmacologists define psychedelic drugs solely as chemicals that have an LSD- or mescaline-like action, working on the serotonin 5-HT2A receptor in the brain. Some people have applied the term psychedelic to other hallucinogens including dissociative NMDA receptor antagonists such as phencyclidine, dextromethorphan, and ketamine, tropane deliriants such as atropine, and other psychoactives such as Amanita muscaria, cannabis (to some extent), Salvia divinorum.