What are the four main classes of antihypertensives?

What are the four main classes of antihypertensives?

• A. Antibodies, antivirals, antifungals, steroids
• B. Diuretics, beta blockers, ACE inhibitors, and calcium channel blockers
• C. Calcium, potassium, sodium, chloride
• D. Nitrates, beta agonists, diuretics, ACE inhibitors

Answer: (B)

Lowering blood pressure relies on targeting different parts of the cardiovascular system, and the four main drug classes commonly taught for hypertension are diuretics, beta-blockers, ACE inhibitors, and calcium channel blockers. Diuretics help reduce blood pressure by increasing urine output, which lowers plasma volume and, over time, reduces arterial pressure. Beta-blockers decrease the heart’s workload by lowering heart rate and contractility, and they also dampen renin release, which helps reduce blood pressure. ACE inhibitors block the enzyme that forms angiotensin II, a powerful vasoconstrictor, leading to vasodilation and less aldosterone-driven water retention. Calcium channel blockers prevent calcium from entering vascular smooth muscle and cardiac cells, causing vasodilation and a drop in peripheral resistance. Other options don’t fit as the four main antihypertensives: antibodies, antivirals, antifungals, and steroids are not primary antihypertensive classes; electrolytes like calcium, potassium, sodium, and chloride are minerals, not drug classes; nitrates and beta agonists are used for other conditions (nitrates mainly for angina, beta agonists for bronchodilation or acute cardiac effects) and do not comprise the standard four foundational antihypertensive categories.

Lowering blood pressure relies on targeting different parts of the cardiovascular system, and the four main drug classes commonly taught for hypertension are diuretics, beta-blockers, ACE inhibitors, and calcium channel blockers.

Diuretics help reduce blood pressure by increasing urine output, which lowers plasma volume and, over time, reduces arterial pressure. Beta-blockers decrease the heart’s workload by lowering heart rate and contractility, and they also dampen renin release, which helps reduce blood pressure. ACE inhibitors block the enzyme that forms angiotensin II, a powerful vasoconstrictor, leading to vasodilation and less aldosterone-driven water retention. Calcium channel blockers prevent calcium from entering vascular smooth muscle and cardiac cells, causing vasodilation and a drop in peripheral resistance.

Other options don’t fit as the four main antihypertensives: antibodies, antivirals, antifungals, and steroids are not primary antihypertensive classes; electrolytes like calcium, potassium, sodium, and chloride are minerals, not drug classes; nitrates and beta agonists are used for other conditions (nitrates mainly for angina, beta agonists for bronchodilation or acute cardiac effects) and do not comprise the standard four foundational antihypertensive categories.