When you’re in a stressful or tense situation, your body has a natural fight-or-flight response that causes your heart to beat faster than normal. Beta blockers are a class of medications that prevent the stress hormones that contribute to your body’s fight-or-flight response from affecting your heart.
Most beta blockers are designed to treat heart conditions, such as high blood pressure, an irregular heartbeat or a high risk of heart attack. They’re also used to treat anxiety disorders, hyperthyroidism, tremors and diseases like glaucoma.
Below, we’ve explained what beta blockers are in more detail, as well as what they do to your body when you use them. We’ve also explained how beta blockers can be useful for treating anxiety and calming your nerves in tough, stressful situations.
Also known as beta-adrenergic blocking agents, beta blockers are medications that block the effects of adrenaline, or epinephrine — as well as other stress hormones like noradrenaline — on your heart.
Adrenaline and noradrenaline are used by your body to activate your fight-or-flight mechanism, which is designed to protect you in a dangerous situation.
Normally, being in a stressful situation causes your body to secrete increasing levels of stress hormones, including adrenaline, resulting in a noticeably faster heartbeat. You might also notice your hands becoming shaky and sweaty, as well as your voice becoming unsteady and faint.
Many people also experience dizziness — another physical effect of an increase in your body’s adrenaline levels. This increase in adrenaline — and its noticeable effects — can cause you to panic when under pressure.
Beta blockers reduce the effects of adrenaline on your heart, making it easier for your heart to relax in the presence of stress hormones. Instead of a fast heartbeat, your heart will beat at a normal pace, limiting the physical effects of adrenaline on your body.
There are numerous beta blocker medications available. Most beta blockers target the heart specifically, while others can also target the lungs and blood vessels. Beta blockers can also work to enhance the effects of another class of medications known as ACE inhibitors, which work by reducing your body’s secretion of angiotensin, a hormone that can restrict your blood vessels.
Beta blockers are used to treat several different conditions. Most beta blockers were designed to treat heart conditions such as high blood pressure and irregular heartbeat (atrial fibrillation), both of which can contribute to excessive stress on the heart.
By reducing the amount of stress on the heart muscles, beta blockers can make heart attacks and other major health issues less likely — which is why they’re frequently prescribed to people with these conditions.
Many doctors also prescribe beta blockers for anxiety. By blocking the effects of stress hormones like adrenaline on your heart, beta blockers can block the physical effects of anxiety on your body, such as sweating, a rapid heartbeat or dizziness.
When using beta blockers for anxiety, It’s important to understand they don’t treat the psychological causes of anxiety itself. Instead, they just make it easier for you to handle the physical reaction your body might have to feelings of anxiety.
Some beta blockers are also used to help treat hyperthyroidism, which can contribute to excessive weight loss, tremors, sleep issues, nervousness and other symptoms.
Beyond treating heart conditions and reducing the physical effects of anxiety, beta blockers may also have other health benefits.
For example, some beta blockers are linked to reduced levels of bone mineral loss in people with high blood pressure who are at risk for conditions like osteoporosis and bone resorption, when compared to calcium channel blockers.
Beta blockers have been in use since the 1960s, but today, there are several beta blockers on the market, many of which are actively used as treatments for heart and anxiety conditions. Some of the most widely used beta blockers include:
Like almost all medications, beta blockers can have side effects. Most of the side effects of beta blockers are fairly mild. It’s also possible for beta blockers to interact with other medications and cause more severe, serious side effects.
The vast majority of people who use beta blockers do not experience side effects. Overall, beta blockers are safe and very effective, with a low risk of side effects when used according to your doctor’s instructions.
The most common side effects of beta blockers are:
There are also several less common side effects of beta blockers. These include:
Because beta blockers affect your heart rate, they can also affect your life in ways unrelated to anxiety and heart issues:
Overall, beta blockers are a safe, reliable and effective medication. Most people who take beta blockers experience few or no side effects, especially with the newer medications used today.
There are two main types of beta blocker medications: selective beta blockers and nonselective beta blockers.
Selective beta blockers are designed specifically to block the β1 receptors, which are primarily located in the heart. Because the action of these beta blockers is more specific, they’re usually safe for use if you have diabetes.
Common selective beta blockers include acebutolol, atenolol, bisoprolol, betaxolol, bevantolol, celiprolol, metoprolol, esmolol and nebivolol.
Because selective beta blockers only affect the β1 receptors, which are concentrated in heart tissue, they tend to be used to treat heart conditions and aren’t a popular treatment option for anxiety.
Nonselective beta blockers are designed to block the β1, β2 and β3 receptors. This means that as well as targeting beta receptors in the heart, they also affect the veins, liver, pancreas and a range of other parts of the body.
Common nonselective beta blockers include alprenolol, carteolol, oxprenolol, propranolol and sotalol. As well as being used to treat certain heart conditions, nonselective beta blockers can be used to treat some physical effects of anxiety.
Unlike selective beta blockers, nonselective beta blockers are not considered safe to use if you have diabetes.
Beta blockers are some of the most widely used medications in the world, prescribed for heart conditions, anxiety and more. Safe, easy to use and effective, they provide fast and noticeable results that make them ideal for preventing chronic anxiety and panic attacks.
Our guide to propranolol goes into more detail on how one of the most widely used beta blocker medications works, from its history to major benefits, potential side effects, drug interactions and more.