Pharmacodynamics
Pharmacodynamics describes how a drug interacts with biological targets and generates effects. Concentration–response relationships depend on receptor signaling and the measured endpoint.
Open interactive lesson & self-check ↗Pharmacodynamics — learning map
Original conceptual SVG · scalableOriginal schematic relationship map for this topic; relationships are organized for study, not intended as an anatomical depiction or a diagnostic algorithm.
Receptors and targets
Agonists activate signaling; antagonists may prevent agonist action. Not every drug requires a classical receptor, as enzymes and ion channels are also targets.
Potency
Potency describes the amount or concentration needed for a defined response and does not by itself establish better clinical efficacy or safety.
Efficacy
Intrinsic activity and tissue context help determine maximal effect; a partial agonist can produce a lower maximal response than a full agonist in a given system.
Therapeutic index
A therapeutic window considers exposure associated with benefit and unacceptable adverse effects; monitoring needs vary by drug and patient factors.
Reference and next reading
Explore the original curriculum and publisher-hosted resources for full-depth reading; this note is an original schematic introduction, not an exhaustive chapter.