How to classify drugs in retail pharmacies? The third nine-day solstice after beginning of winter-the coldest day in winter.

Drugs are divided into prescription drugs and over-the-counter drugs. * * * There are seven departments: internal medicine, surgery, orthopedics, gynecology, pediatrics, dermatology and ENT. Some drugs in various subjects are also divided into oral and external drugs, including different dosage forms. Among them, OTC drugs are also divided into Class A and Class B (the red OTC mark is Class A and the green OTC mark is Class B).