The National Drug Code Directory contains prescription pharmaceuticals, over-the-counter drugs and insulin products that are in final marketed form, reports the U.S. Food and Drug Administration. The National Drug Code Directory lists only products intended for humans. The directory, which is maintained online by the FDA, contains drugs intended for commercial distribution. Each drug's listing information is submitted electronically by registered drug establishments that manufacture, prepare, compound or process drug products distributed in the United States.
The National Drug Code Directory does not include drugs intended for animals, blood products or human drugs not in final marketed form, notes the FDA. Assignment of an National Drug Code to a nondrug product is prohibited.
The federal Drug Listing Act of 1972 requires that drug establishments registered with the FDA provide updated lists of their products, according to the FDA. Products in the National Drug Code Directory have individual assigned specific numbers. The National Drug Code is a unique 10-digit identifier composed of three segments that identify the product labeler company, the product and the trade package size. The FDA assigns a labeler code to each manufacturer, repackager or distributor, explains Drugs.com. Each labeler provides the product code numbers, which identify the product's specific formulation, strength and form of dosage, as well as the package code, which identifies the size and type of packaging on the market.