Pharmacodynamics: Is the study of how drugs have

Pharmacodynamics is the study of how drugs have effects on the body. The most common mechanism is by the interaction of the drug with tissue receptors located either in cell membranes or in the intracellular fluid. Pharmacodynamics is a branch of pharmacology that focuses on the study of how drugs interact with the body at the molecular, cellular, and systemic levels to produce their effects. Pharmacodynamics (sometimes described as what a drug does to the body) is the study of the biochemical, physiologic, and molecular effects of drugs on the body and involves receptor binding (including receptor sensitivity), postreceptor effects, and chemical interactions. Pharmacodynamics studies a drug's molecular, biochemical, and physiologic effects or actions. It comes from the Greek words "pharmakon," meaning "drug," and "dynamikos," meaning "power."