Yohimbe is an evergreen tree native to western Africa in Nigeria, Cameroon, the Congo and Gabon. The bark of the yohimbe plant contains the active compounds called alkaloids, of which the principal alkaloid is called yohimbine. Yohimbe has been used for centuries in African folk medicine to treat fevers, leprosy, coughs, and as a local anesthetic. Generally, yohimbe is an herbal remedy that is claimed to be useful as an aphrodisiac and for treating several health conditions, such as depression, high blood pressure, and various sexual problems. Yohimbe bark is also smoked or snuffed for its hallucinogenic effects.