This document summarizes the molecular and cellular mechanisms of anesthesia. It discusses that anesthetics act through multiple pathways in the central nervous system and cells. While earlier hypotheses proposed that anesthetics act primarily by disrupting neuronal lipid membranes, more recent evidence suggests that specific protein interactions play a key role. Many anesthetics enhance the effects of the neurotransmitter GABA and inhibit NMDA receptors. Overall, anesthetics seem to exert their effects through direct actions on specific ligand-gated ion channels in the central nervous system.