And if not a drug, what do they do then?
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Typically a sedative, such as a benzodiazepine. Hallucinogenic drugs usually work by stimulating certain parts of the brain, while benzodiazepines have an overall calming effect on brain activity.
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It's hard to say.. usually just time. Possibly a tranquilizer to induce sleep because moat halucinogenics are also stimulating thus preventing much sleep.