The trade name of a drug is the name of the drug selected by each enterprise. The same drug may have different trade names in different enterprises, which brings some inconvenience and trouble to clinical use and mutual communication. On this basis, the generic names of drugs were established and developed. The generic drug name, also known as the International Generic Drug Name (INN), is the name recommended by the World Health Organization (WHO). INN usually refers to the active drug substance, not the final drug, and is the same name used by pharmaceutical researchers and medical staff. Therefore, a drug has only one generic name, which is more convenient to use than the trade name. The generic name of a drug is not protected by patents and administration, but is the name of the active ingredient indicated in all documents, materials, teaching materials and drug instructions. The generic name of a drug is also the name used in the Pharmacopoeia.