"The USP-NF" is a single-volume combination of two official compendia, the United States Pharmacopeia (USP) and the National Formulary (NF). Monographs for drug substances and preparations are featured in the USP. Monographs for dietary supplements and ingredients appear in a separate section of the USP. Excipient monographs are included in the NF.The U.S. Federal Food, Drug, and Cosmetics Act designates the USP-NF as the official compendia for drugs marketed in the United States. A drug product in the U.S. market must conform to the standards in USP-NF to avoid possible charges of adulteration and misbranding. The USP-NF is also widely used by manufacturers wishing to market therapeutic products worldwide. Meeting USP-NF standards is accepted globally as assurance of high quality.This title provides six-Month implementation guideline. "United States Pharmacopoeia 31 - National Formulary 26" and its Supplements will become official six months after being released to the public. The USP-NF, which is released on 1 November of each year, will become official on 1 May of the following year. This change was adopted to give users more time to bring their methods and procedures into compliance with new and revised USP-NF requirements.The "United States Pharmacopoeia 31 - National Formulary 26" and any following Supplements and Interim Revision Announcements (IRAs) to that edition, are official as of 1 May 2008, superseding the "United States Pharmacopoeia 30 - National Formulary 25".The CD-ROM edition of the "United States Pharmacopoeia 31 - National Formulary 26" (ISBN 0119899078) is available to buy separately, see below.