Beta Blocker Side Effects (Adverse Effects)

What are beta blockers?

Beta blockers are a class of drugs that block beta-adrenergic substances such as adrenaline (epinephrine), a key agent in the "sympathetic" portion of the autonomic (involuntary) nervous system and activation of heart muscle. By blocking the action of the involuntary nervous system on the heart, beta blockers relieve stress on the heart. These drugs are used for the treatment of irregular heart rhythms, chest pain, heart attack, hypertension, migraine headaches, social phobias, tremors, and glaucoma.

Common side effects of beta blockers are nausea, vomiting, abdominal cramps, diarrhea, and weight gain if you are taking medicine for diabetes (type 1 and type 2). There are other important side effects and serious adverse effects of this drug class that include, blurred vision, insomnia, hair loss, disorientation, CNS system effects, and serious heart problems. Beta blockers interact with several other drugs, for example, chlorpromazine (Thorazine), clonidine (Catapres), Phenobarbital, nonsteroidal anti-inflammatory drugs (NSAIDs) including aspirin, and diabetes medications, including insulin.

Examples of generic and brand names available for beta blockers in the US include: acebutolol (Sectral), atenolol (Tenormin), bisoprolol (Zebeta), metoprolol (Lopressor, Lopressor LA, Toprol XL), nadolol (Corgard), timolol (Blocadren). Talk with your doctor, pharmacist, or other medical professional if you have questions about beta-blockers.

If you notice other effects not listed above, contact your doctor or pharmacist. In the US -Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.In Canada - Call your doctor for medical advice about side effects. You may report side effects to Health Canada at 1-866-234-2345.

Read the entire beta-blockers consumer monograph >>

What are the side effects and adverse effects of beta blockers?

Beta blockers may cause:

Other important side effects include:

As an extension of their beneficial effect, they slow heart rate and reduce blood pressure, but they may cause adverse effects such as heart failure or heart block in patients with heart problems.

Beta blockers should not be withdrawn suddenly because sudden withdrawal may worsen angina (chest pain) and cause heart attacks, serious abnormal heart rhythms, or sudden death.

Central nervous system effects of beta blockers include:

Beta blockers that block β2 receptors may cause shortness of breath in asthmatics.

As with other drugs used for treating high blood pressure, sexual dysfunction may occur.

Beta blockers may cause low or high blood glucose and mask the symptoms of low blood glucose (hypoglycemia) in people with diabetes.

Other serious side effects of beta-blockers include:

  • Toxic epidermal necrolysis
  • Raynaud's phenomenon
  • Lupus erythematosus
  • Bronchospasm
  • Serious allergic reactions
  • Erythema multiform
  • Steven Johnson Syndrome
  • Toxic epidermal necrolysis

If you notice other effects not listed above, contact your doctor or pharmacist. In the US -Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.In Canada - Call your doctor for medical advice about side effects. You may report side effects to Health Canada at 1-866-234-2345.

Read the entire beta-blockers consumer monograph >>

Medically Reviewed by a Doctor on 5/17/2017

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