Related entries: Red Cinchona Bark
Quinoidine, chinoidin (Chinoidinum), or amorphous quinine is a mixture of alkaloids, mostly amorphous, obtained from the mother liquors left in preparing quinine and the other crystallisable alkaloids from cinchona bark. From these mother liquors it is precipitated by an alkali, washed, and dried. It occurs in brownish-black masses of a resin-like appearance with a very bitter and nauseous taste.
Almost insoluble in water; soluble in acid solutions.
Action and Uses.—It is used as a cheap febrifuge in intermittent and remittent fever. Salts of quinoidine are prepared; the tannate is sometimes used in veterinary medicine.
Dose.—6 to 90 centigrams (1 to 15 grains).