What kinds of drugs are common?

There are many common drugs and many classification methods. For example, therapeutic drugs, preventive drugs, diagnostic drugs, western medicine, traditional Chinese medicine, prescription drugs and over-the-counter drugs, analgesics and antibacterial drugs generally do not need to fully understand these complicated drug classifications, but they need to have some common sense of drug classification, especially what western medicine and traditional Chinese medicine are and what prescription drugs and over-the-counter drugs are.