usp.org -- USP Provides Additional Information on Recall and Reissuance of USP 33–NF 28. With this second notice following the first notice of January 8, 2010, The United States Pharmacopeial Convention (USP) provides additional information about its recall of the United States Pharmacopeia 33 – National Formulary 28 (USP 33–NF 28) and its plans to reissue the publication.