Drug receptors are specialized proteins located on the surface of cells or within cells that interact with drugs or other molecules. When a drug binds to a receptor, it can trigger a response in the cell, leading to various biological effects. This interaction is crucial for the drug's therapeutic action, as it determines how effectively the drug can influence bodily functions. Receptors can be classified into different types, such as G protein-coupled receptors, ion channels, and nuclear receptors. Each type has a unique mechanism of action and is involved in specific physiological processes. Understanding drug receptors is essential for developing new medications and improving existing treatments.