A prescription drug is a drug that must be dispensed, purchased and used only with a prescription from a licensed physician or a licensed physician assistant. Prescription drugs are indicated by Rx, which are drugs prescribed by a doctor with prescribing authority and then purchased from a hospital pharmacy. Such drugs usually have certain toxicity or other potential effects, and the method and timing of administration have special requirements and must be used under the guidance of a doctor. As a special item to maintain human health, drugs are strictly controlled by the corresponding regulations in every aspect of development, production, sales and use, so they need to be granted authority by the relevant organizations and governments, and they are called prescription rights and prescription drugs. Prescription drugs are not allowed to be advertised, and the state has declared that they cannot be advertised for, and can only be sold and used in hospitals, and they require prescription rights.