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A colourless, viscous, liquid alkaloid that is found in henbane and other plants and that acts pharmacologically to inhibit muscarinic acetylcholine activity by competing with acetylcholine for receptor sites, having the effect of a central nervous system depressant that crosses the blood-brain barrier and produces sedation and amnesia, used as an adjunct to analgesics in surgery and obstetrics and as a preventative of motion sickness. Also called hyoscine. Formula: C17H21NO4. See also methyl scopolamine, truth drug. Compare atropine. [From Latin Scopolia the belladonna genus of plants, named after the Italian naturalist Giovanni Scopoli (1723–88) + amine]

Subjects: Psychology.

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