A psychedelic substance is a psychoactive drug whose primary action is to alter cognition and perception. Psychedelics are part of a wider class of psychoactive drugs known as hallucinogens, a class that also includes structurally unrelated substances such as dissociatives and deliriants. Unlike other drugs such as stimulants and opioids which ind...
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http://en.wikipedia.org/wiki/Psychedelic_drug
any of the so-called mind-expanding drugs that are able to induce states of altered perception and thought, frequently with heightened awareness of ... [6 related articles]
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http://www.britannica.com/eb/a-z/p/127
Synonym for hallucinogen ... <pharmacology> A class of medications (for example LSD, marijuana, peyote, heroin, cocaine) that result in a distorted perception of reality. Often accompanied by hallucinations. ... (27 Sep 1997) ...
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http://www.encyclo.co.uk/local/20973
Type: Term Synonyms: hallucinogen
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http://www.medilexicon.com/medicaldictionary.php?t=26726
Any drug that produces hallucinations or altered states of consciousness. Such sensory experiences may be in the auditory, visual, tactile, olfactory, or gustatory fields or in any combination. Among drugs known to have psychedelic effects are LSD (lysergic acid diethylamide), mescaline, and, to a mild degree, marijuana, along with a number of othe...
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https://www.encyclo.co.uk/local/21221
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