Which classification of drugs is used primarily to treat hypertension?

Beta-blockers are a class of medications that are commonly used to treat hypertension, otherwise known as high blood pressure. They work by blocking the effects of adrenaline (epinephrine) on the beta receptors in the heart, which leads to a decrease in heart rate and the force of heart contractions. This results in lowered blood pressure and reduced strain on the heart. Additionally, beta-blockers help in managing symptoms related to heart conditions and can be beneficial in reducing the risk of future heart complications.

In contrast, antidepressants primarily address mood disorders and do not have a direct effect on lowering blood pressure. Antibiotics target bacterial infections and have no application in managing hypertension. Antihistamines are primarily used to alleviate allergic reactions and symptoms associated with such allergies, offering no therapeutic effect on blood pressure control.

Thus, beta-blockers are specifically designed and effective in treating hypertension, making them the correct choice in this context.