Yohimbine is an indole alkaloid ester first identified in several herbal species by the American botanist R. Raymond-Hamet in 1934. Today its main sources are the African evergreen yohimbe (Pausinystalia yohimbe) and Indian snakeroot (Rauwolfia serpentina). Yohimbe bark is sold over the counter as an herbal aphrodisiac. Yohimbine hydrochloride is a prescription drug that has been used to treat erectile dysfunction with varying results.
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