Published by U.S. Pharmacopeia (USP), a private nonprofit organization, the USP is a compendium of drug uses, covering both on-label and off-label uses. Using panels of expert physicians who evaluate the literature and clinical practice, the USP presents information on which drugs are recommended for which uses, warnings, contraindications, dosages, etc. To keep up with best practices, it is updated regularly. The USP is the best known of several such compendia. The USP also publishes the National Formulary. The Complete Drug Reference, published jointly with Consumer Reports, is the consumer version of the USP. The Complete Drug Reference contains more information than the Physicians Desk Reference (PDR), which is useful but compiles product label information only and thus does not deal with off-label usages.