The United States Pharmacopoeia is a compendium of drug information published annually by the United States Pharmacopoeial Convention.

Somewhat confusingly, both the compendium and the organization are referred to as the USP.

Drug products and ingredients must conform to established USP quality standards in order to receive USP or NF (National Formulary) designators. Drugs designed for humans (over-the-counter, prescription and otherwise), drugs designed for animals, dietary supplements and food ingredients are subject to this set of standards: failure to meet requirements for purity, strength or quality result in an adulterated product that may no longer bear the USP or NF designators.

The United States Pharmacopoeial Convention is not responsible for enforcement, which is carried out by the US FDA and other government authorities.

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