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(Science: chemical) A plant alkaloid with alpha-2-adrenergic blocking activity. Yohimbine has been used as a mydriatic and in the treatment of impotence. It is also alleged to be an aphrodisiac.

Pharmacological action: adrenergic alpha-antagonists, aphrodisiacs, mydriatics, sympatholytics.

Chemical name: Yohimban-16-carboxylic acid, 17-hydroxy-, methyl ester, (16alpha,17alpha)-