yohimbine

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yohimbine

[yō′him‚bīn]
(pharmacology)
C21H26N2O3 An alkaloid derived from plants that is a weak blocker of alpha-adrenergic receptors, used as a mydriatic and in the treatment of impotence.
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Along with yohimbe bark, the drink contains vitamins B-12, B-6 and taurine, which is an essential amino acid.