Health Library Beta-Blockers for Fast Heart RatesFrom Healthwise

Beta-blockers help slow the heart rate by blocking the effect of the hormone adrenaline. This reduces the number of electrical impulses that pass through the atrioventricular (AV) node to the lower heart chambers (ventricles).

Beta-blockers are used to help control the heart rate. They are also used to treat high blood pressure and angina (chest pain).

Beta-blockers are very effective at slowing the heart rate. Some of the medicines have also been shown to be helpful for people with coronary artery disease or heart failure.

Side effects of beta-blockers include:

• Fatigue.
• Dizziness.
• Inability to get or maintain an erection (impotence).
• Cold arms, hands, legs, or feet due to poor blood flow to these areas.
• Lack of awareness of severe low blood sugar levels in people with diabetes who take insulin or oral hypoglycemics.
• Depression.
• Slow heart rate.
• Shortness of breath.
• Wheezing in people with asthma.

See Drug Reference for a full list of side effects. (Drug Reference is not available in all systems.)

Beta-blockers can sometimes slow down the heart rate too much. They can also worsen long-term (chronic) heart failure. Close monitoring during treatment is important, although most people do not have serious side effects from this medicine.

Some of these medicines may cause symptoms to worsen in people who have asthma, chronic obstructive pulmonary disease (COPD), and some types of heart failure.

Complete the new medication information form (PDF)(What is a PDF document?) to help you understand this medication.

Author:	Monica Rhodes	Last Updated: September 26, 2006
Medical Review:	Caroline S. Rhoads, MD - Internal Medicine Laurence Epstein, MD - Cardiac Electrophysiologist
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