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The hallucinogens are a class of psychoactive drugs, either synthetic or plant products, that produce auditory and/or visual hallucinations as well as thought, mood, and perceptual changes. Depending on dosage, expectation (set), and environment (setting), they also can induce euphoria and a state similar to a transcendental experience. These hallucinations can be present as part of a delirium (e.g., from jimsonweed [Datura stramonium]) when accompanied by disturbances in judgment, orientation, intellect, memory, and emotion. Delirium also can result from drug withdrawal (e.g., associated with sedative-hypnotic and/or alcohol withdrawal).
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