The FDA enforces the edition current on the date of testing unless a specific prior edition is referenced in an approved NDA or ANDA (rare). For compendial status, the latest edition applies.
(United States Pharmacopeia 39th Edition) was a landmark publication in pharmaceutical history, primarily because it signaled the major transition to modern safety standards for elemental impurities Key Scientific Shift: Out with the Old, In with the Precise usp 39 pdf
If you need a for compliance, research, or litigation, always obtain it legally through USP, a university library, or a legitimate resale of the print edition. Never risk your professional reputation or your organization’s regulatory standing by downloading an unauthorized copy. Understanding USP 39 PDF: A Complete Guide to