This section is from the "A Handbook of Useful Drugs" book, by State Medical Examining and Licensing Boards.
The dried bark of different species, principally hybrids, of Cinchona yielding not less than 5 per cent, of anhydrous cinchona alkaloids, the chief of which is quinin.
Action and Uses: The preparations of cinchona are seldom used to obtain the systemic effects of quinin. They are mostly employed as bitter tonics. (See Quinin.)