Pharmacopoeias are official books published by regulatory bodies that set standards for drugs. They contain monographs that provide detailed information about individual drugs, including chemical properties, identification tests, assays, purity levels, and dosage. Formularies are publications that contain lists of medicines and brief information about their uses. Together, pharmacopoeias and formularies are considered drug compendia. Examples of major compendia include the British Pharmacopoeia, United States Pharmacopoeia, and Indian Pharmacopoeia.