Sources of Drugs. Drugs are obtained from many sources. Many inorganic materials, such as metals, are chemotherapeutic; hormones, alkaloids, vaccines, and antibiotics come from living organisms; and other drugs are synthetic or semisynthetic.ore on drugs Sources of Drugs from Infoplease: 1  drugs: Sources of Drugs-Sources of Drugs Drugs are obtained from many sources. 2  Many inorganic materials, such as metals, ...