A. Metoprolol (Lopressor, Toprol) belongs to a class of drugs known as beta blockers. As you mentioned, these drugs reduce your heart rate; they also lower blood pressure. They work by blocking the effects of the hormone epinephrine (also known as adrenaline), causing your heart to beat more slowly and with less force.
How Beta Blockers Lower Blood Pressure. Beta blockers work by blocking the effect of epinephrine (adrenaline) on the tissues—specifically, by blocking the “beta receptors” that bind epinephrine. Among other things, blocking the beta receptors slows the heart rate, reduces the force of contraction of the heart muscle, reduces the amount of oxygen the heart muscle needs to do its work, reduces stress on the vascular system, and tends to lower the blood pressure. 1 .
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Beta blockers slow your heart rate, which can prevent the increase in heart rate that typically occurs with exercise. This means that it might not be possible for you to reach your target heart rate — the number of heartbeats per minute you aim for to ensure you're exercising hard enough.
The Beta blocker Propranolol 20mg twice daily is a relatively low dose, and will not drop your heart rate or BP to dangerously low levels. The question is why are you taking it? If for PVCs, it will help reduce their frequency. However, you need to make sure your heart is otherwise normal. Read this blog: PVCs and a low heart rate Hope this helps, Dr T
In people who have diabetes, beta blockers may block signs of low blood sugar, such as rapid heartbeat. It's important to check your blood sugar regularly if you have diabetes and you're taking a beta blocker. Beta blockers can also affect cholesterol and triglyceride levels.
Beta blockers subvert these processes by settling onto beta receptors and preventing the chemical messengers from binding to their receptors. That slows the heart, improves the conduction of electrical signals in the heart, relaxes blood vessels, and lowers blood pressure.
Beta-blockers work by blocking the effects of epinephrine (adrenaline) and slowing the heart 's rate, thereby decreasing the heart’s demand for oxygen. Long-term use of beta-blockers helps ...
Beta blockers may be used to treat abnormal heart rhythms and to prevent abnormally fast heart rates called tachycardia, or irregular rhythms like atrial fibrillation. Since they reduce the demand of the heart muscle for oxygen, they may be useful in treating angina, or chest pain , which occurs when the oxygen demand of the heart exceeds the supply.