PD (Pharmacodynamics)

Pharmacodynamics (PD) is the branch of pharmacology that studies how drugs affect the body. It explores the relationship between drug concentration and the resulting effects on biological systems, including how drugs interact with receptors, enzymes, and other molecules. Essentially, PD helps us understand what a drug does once it enters the body—how it produces its effects, what doses are needed for desired outcomes, and how these effects can vary from person to person. This knowledge is crucial for developing safe and effective medications.