This section provides background information on the United States Pharmacopeial Convention (USP), as well as general information about the United States Pharmacopeia and the National Formulary (USP–NF). Whether a document is official or not official is not linked to when a specific publication becomes official, but is based on the individual document. USP publishes the USP–NF on a set schedule, and each individual document is associated with its indicated official date. Learn more about USP’s document-centric official dates on our website (www.uspnf.com/new-uspnf-online-faqs/end-user#irg1).