Quassia, Picrasma excelsa, is a member of the Simaroubacea family. It is indigenous to the Caribbean. Quassia bark is used in medicinal formulas. Quassia leaves have also been used occasionally. Quassia contains quassinoids, beta-caboline alkaloids, quassin, quassimarin, canthin-6-one, and smaller amounts of courmain scopoletin. These constituents possess unique pharmacological activities. Quassia has been sued for indigestion, loss of appetite, constipation, and menstrual complaints.