Yohimbine's a tryptamine alkaloid and's the active chemical constituent of the medicinal herb Pausinystalia yohimbe (formerly Corynanthe yohimbe), also known as yohimbe or yohimbe bark. Yohimbine's a stimulant drug and purportedly has aphrodisiac qualities. Function Aphrodisiac The NIH states that yohimbine hydrochloride's the standardized form of yohimbine that's available as a prescription medicine in the United States, and has been shown in human studies to be effective in the treatment of m… (More on Yohimbine)