Beta Blockers

Pharmacy Author:
Medical and Pharmacy Editor:

What are beta blockers and how do they work?

Beta blockers, also known as beta-adrenergic blocking agents, are drugs that block norepinephrine and epinephrine (adrenaline) from binding to beta receptors on nerves. There are three types of beta receptors and they control several functions based on their location in the body.

  • Beta-1 (β1) receptors are located in the heart, eye, and kidneys;
  • beta (β2) receptors are found in the lungs, gastrointestinal tract, liver, uterus, blood vessels, and skeletal muscle; and
  • beta (β3) receptors are located in fat cells.

Beta blockers primarily block β1 and β2 receptors. By blocking the effect of norepinephrine and epinephrine, beta blockers reduce heart rate; reduce blood pressure by dilating blood vessels; and may constrict air passages by stimulating the muscles that surround the air passages to contract.

What are some examples of beta blockers?

What are the side effects of beta blockers?




Report Problems to the Food and Drug Administration

You are encouraged to report negative side effects of prescription drugs to the FDA. Visit the FDA MedWatch website or call 1-800-FDA-1088.

Pill Finder Tool

Need help identifying pills and medications?
Use the pill identifier tool on RxList.


Back to Medications Index

Get the latest health and medical information delivered direct to your inbox FREE!