Drugs that alter nervous-system function are among the most widely used medications. Neuropharmacology studies how these agents act on receptors, ion channels, transporters, and intracellular signaling pathways to produce therapeutic or adverse effects.

Targets include neurotransmitter systems for dopamine, serotonin, acetylcholine, GABA, and glutamate, as well as voltage-gated channels and second-messenger cascades. Understanding these interactions guides the development of treatments for depression, schizophrenia, epilepsy, Parkinson’s disease, pain, and many other conditions. It also explains the actions of drugs of abuse and the mechanisms of tolerance and dependence.

Modern neuropharmacology combines molecular biology, electrophysiology, behavioral testing, and increasingly precise imaging of drug occupancy in the living brain. The goal is both better medicines and deeper insight into the neural basis of behavior and disease.

A single receptor subtype can be the difference between a useful therapeutic and a compound with unacceptable side effects.