The Mechanics of Medicine: An Essay on Pharmacodynamics Pharmacodynamics is the study of a drug's molecular, biochemical, and physiological effects on the body. While pharmacokinetics describes "what the body does to the drug" through absorption and metabolism, pharmacodynamics describes . This field is fundamental to medicine as it explains how chemical compounds translate into therapeutic outcomes or adverse reactions. Mechanisms of Drug Action
Central to pharmacodynamics is the , which quantifies how the intensity of an effect changes with varying drug concentrations. This is typically visualized using a concentration-response curve. Key metrics include: Emaxcap E sub m a x end-sub : The maximal effect a drug can produce regardless of dose. EC50cap E cap C sub 50 pharmacodynamic
indicates higher affinity, meaning lower doses are often required for effect. The Dose-Response Relationship The Mechanics of Medicine: An Essay on Pharmacodynamics