The is a critical compendium of quality standards for medicines, active pharmaceutical ingredients (APIs), and excipients. Released for use in 2015, this version remains a foundational reference for pharmaceutical professionals, researchers, and students worldwide.

is a historical pharmaceutical reference that became official on May 1, 2015. While some websites claim to offer "free downloads," the USP-NF text is fully copyrighted

Contains monographs for drug substances, dosage forms, and compounded preparations.

The is a copyrighted, proprietary reference standard published by the US Pharmacopeial Convention (USP) . It is not legally available as a free PDF download from any authorized source. USP actively monitors and enforces its copyrights.

It featured significant updates to General Chapters and , which established limits and testing procedures for elemental impurities (like lead and mercury) in drug products.

United States Pharmacopeia 38 (USP 38) and National Formulary 33 (NF 33)

First, let us decode the search term. USP 38–NF 33 refers to the combined and the National Formulary (NF) .