USP 39 is not the current edition . As of 2025, the current edition is USP–NF 2025 (Issue 1). Using USP 39 for active drug manufacturing or release testing would be non-compliant with FDA regulations.
– Many papers from 2016–2018 reference USP 39 <1225> (Validation of Compendial Procedures) and <1226> (Verification of Compendial Procedures). Example: Journal of Validation Technology (2017) often compared USP 39 to ICH Q2(R1). usp 39 pdf