The National Drug Code (NDC) is a unique product identifier used in the United States for drugs. It is a unique 10-digit, 3-segment numeric identifies the labeler, product, and trade package size. The first segment, the labeler code, is assigned by the FDA and both the product and package codes are assigned by the firm. The NDC labeler code of our company is 43666, while NDC number of our main API product, Clarithromycin, is 43666-0001-4.