Beta blockers (sometimes written as β-blockers) are a class of drugs used for various indications, but particularly for the management of hypertension and cardiac arrhythmias. Beta blockers may also be referred to as beta-adrenergic blocking agents, beta-adrenergic antagonists, or beta antagonists.

Pharmacology

There are three known types of beta receptor, designated β₁, β₂ and β₃. β₁-Adrenergic receptors are located mainly in the heart, kidney, and adipose tissue. β₂-Adrenergic receptors are located mainly in the heart, lung, GI tract, liver, pancreas, and skeletal muscle. The role and location of β₃-receptors is less well-defined.