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Overview. 1  Quinine, a bitter tasting powder made from the bark of the cinchona tree, is known mainly for its use in malaria treatment. 2  Tonic water, a bitter liquid sometimes used as a mix for alcoholic drinks, contains only a small amount of quinine compared to quinine medications.
1. Plant Sources: Plant source is the oldest source of drugs. Most of the drugs in ancient times were derived from plants. Almost all parts of the plants are used i.e. . leaves, stem, bark, fruits and roots. Sheep thyroid is a source of thyroxin, used in hypertension. 2  Cod liver is used as a source of vitamin A and D. 3  Anterior pituitary is a source of pituitary gonadotropins, used in treatment of infertility.