Drug therapy is a part of human culture, and the history of human using drug therapy is almost as long as the history of human itself. The use of drug therapy has about two purposes: one is to fight diseases and maintain health.

Medication is either because a healthy human body can't make some substances needed to maintain health, and these substances need to be ingested from the outside. Another purpose of medication is that medication has become a mysterious cult, and its role is no longer just to fight diseases and maintain health, but also to make drug users live forever.

Throughout the ages, from the warlocks in ancient Greece to the literati in Wei and Jin Dynasties, from Faust to the emperors in China, taking medicine to make an alchemy and pursuing eternal life is one of the important contents of their lives. Of the two purposes of drug therapy, the former always floats on the surface, while the latter is hidden in the deep heart of every drug user. Therefore, the use of medication not only reflects our dissatisfaction with our own congenital defects (lack, disease, aging, death), 

but also includes our own care and love for ourselves.

Drug therapy can be classified in many ways, the most common of which is based on efficacy, drug properties and affected body parts. The anatomical therapeutics and chemical classification system (ATC) introduced by the World Health Organization (WHO) in 1976 is widely used.

Antipyretic: Relieve body fever.

Analgesics: Relieve pain

Anti-malarial: A drug to eliminate malaria.

Antibiotics: Inhibit the growth of bacteria

Antimicrobial: Prevent bacteria from growing in the wound.