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Definition of Drug Dynamics

by Angela Cafiero Moroney, PharmD

Drug dynamics (pharmacodynamics) involves what a drug does to the body.

Drug dynamics describes the therapeutic effects of drugs (such as relief of pain and reduction of blood pressure) and their side effects. But drug dynamics also describes where (the site) and how (the mechanism) a drug acts on the body. A drug’s effects on the body may be influenced by many factors, such as a person’s age (see Aging and Drugs), genetic makeup, and other medical conditions the person has other than the one being treated (see Overview of Response to Drugs).