Lopressor

How Does It Work?

Lopressor is part of a class of drugs called beta-adrenergic blocking agents, or beta blockers for short. As the name implies, beta blockers work by blocking beta receptors in the body. Beta receptors are located in a number of places within the body, including the heart and blood vessels. These receptors are what stress hormones (such as adrenaline) attach to, and they cause certain reactions in the body, such as an increase in:
 
Lopressor helps to block a specific type of beta receptor called beta-1 receptors. By blocking these receptors, the medication causes the reverse effect of these stress hormones. It decreases heart rate and both systolic and diastolic blood pressure, as well as the workload of the heart. This means that the heart requires less blood and oxygen to work properly.
 
Lopressor is a beta-1 selective (or cardioselective) beta blocker. This means that it mostly blocks beta-1 receptors, especially at normal doses. However, it can block beta-2 receptors in the lungs to some extent, especially at higher dosages. This can lead to breathing problems, especially in people with asthma or similar conditions.
 

Clinical Effects

By lowering blood pressure, Lopressor can decrease the risks that accompany long-term high blood pressure (see Effects of High Blood Pressure). By decreasing the workload of the heart, the drug can also decrease the number of angina attacks and increase exercise tolerance. Finally, although the exact mechanism is not known, Lopressor can increase the rate of survival for people who have just suffered a heart attack.
 
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Information on Lopressor

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