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What are Beta Blockers?

Beta-blockers are used to treat several conditions, usually by regulating heart activity. Also called beta-adrenoreceptor blocking agents, these medications bind to beta receptors present on the cells of the heart, arteries, kidneys and other tissues that are

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Beta-blockers are used to treat several conditions, usually by regulating heart activity.

Also called beta-adrenoreceptor blocking agents, these medications bind to beta receptors present on the cells of the heart, arteries, kidneys and other tissues that are stimulated by the stress hormones (e.g. adrenaline and noradrenaline).

Beta blockers are often used to treat high blood pressure, angina, heart attack and atrial fibrillation. Less common indications include migraine, tremor and anxiety.

Examples of drugs in this class include acebutolol, atenolol, bisoprolol, carvedilol, celiprolol, labetalol, metoprolol, nadolol, nebivolol, oxprenolol, pindolol and timolol.

Mechanism of action

The sympathetic nervous system is part of the autonomic nervous system that controls various vital functions of the body including heart rate and blood pressure.

The two main beta receptors that are targeted by beta blockers are the beta 1 receptor and the beta 2 receptor. A large number of beta 1 receptors are present on the heart and kidney cells, while the beta 2 receptor is the predominant regulator of vascular and nonvascular smooth muscles.

Some beta blockers are selective and block the beta 1 receptor more than the beta 2 receptor. These are called cardioselective agents. Nonselective beta blockers are those that bind to both types of receptors.

Some of the effects of using beta blockers to block these receptors include:

Effects on the kidney - Blocking of the beta 1 receptors on the kidneys prevents the release of renin from juxta-glomerular cells. This suppresses the renin-angiotensin-aldosterone system, helping to regulate blood pressure as well as fluid and electrolyte balance.

Effects on the heart - Beta 1 receptors are present on the sino-atrial node, which is responsible for generating the impulses that make the heart beat. Blocking the sino-atrial node therefore reduces heart rate.

Uses of beta blockers

Some examples of the conditions beta blockers are used to treat include high blood pressure, angina, heart failure, cardiac arrhythmias and atrial fibrillation, anxiety, severely overactive thyroid (thyrotoxicosis), glaucoma and migraine.

Pharmacological Properties

Beta blockers can be taken in the form of capsules, a solution, eye drops or by injection and are usually eliminated from the body via the liver or kidney.

Beta blockers that are soluble in fats such as labetalol, metoprolol, pindolol and propranolol are excreted by the liver, while those that are soluble in water such as atenolol are cleared by the kidney. Fat soluble drugs have a short duration of action, while water soluble drugs have a longer duration of action.

Side effects

Some of the side effects of beta blockers are more common than others.

Some examples of more common side effects are given below:

  • Dizziness
  • Fatigue
  • Cold extremities (hands and feet)
  • Slow heartbeat
  • Blurred vision
  • Diarrhea and nausea

Some examples of the less common side effects include:

  • Insomnia
  • Loss of libido
  • Depression

Sources

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Last Updated: Jun 17, 2023

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Related questions

01What Do Beta-Blockers Do?

These medicines block the actions of stress hormones to help your heart beat more slowly and with less force. They also open up your blood vessels to improve blood flow and lower your blood pressure. Beta-blockers mechanism of action Your body makes two hormones that control your body's stress response: adrenaline (also called epinephrine) and noradrenaline (norepinephrine). Your stress response gets your body ready to fight or run if you're threatened. However, your body can also release these hormones as you go through the stress of everyday life. So, you may have constant high levels of adrenaline and noradrenaline in your system. Adrenaline and noradrenaline trigger your stress response in part by binding to proteins called receptors on the surface of cells in your heart, blood vessels, and muscles. When adrenaline and noradrenaline bind with a receptor, they trigger the cell to behave a certain way. There are a few different types of receptors, but the ones that beta-blockers work on are the beta receptors: beta-1 (B1), beta-2 (B2), and beta-3 (B3). B1 receptors are mainly on the cells of your heart and kidneys. When they are activated in your heart, they increase your heart rate and the force with which your heart pumps blood. When they are activated in your kidneys, they release an enzyme called renin into your bloodstream. B2 receptors are mainly in the tissues of your respiratory system (such as your windpipe and airway tubes), blood vessels, and nervous system. When they're activated, they do the following:

Source: www.webmd.com ↗
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