Which class of medication is a calcium channel blocker?

Amlodipine belongs to the class of medications known as calcium channel blockers. These drugs work by inhibiting the influx of calcium ions into the smooth muscle and cardiac muscle cells during depolarization. As a result, they help to relax and widen blood vessels, which decreases blood pressure and improves blood flow. Calcium channel blockers are primarily used in the management of hypertension and certain types of angina.

The other medications listed serve different purposes: Hydrochlorothiazide is a thiazide diuretic that reduces blood pressure by eliminating excess sodium and water. Lisinopril is an ACE inhibitor that lowers blood pressure by preventing the conversion of angiotensin I to angiotensin II, a potent vasoconstrictor. Simvastatin is a statin that is used to lower cholesterol levels in the blood and reduce the risk of cardiovascular disease. Each of these medications has unique mechanisms of action and uses in treating various conditions, distinguishing them from amlodipine, which specifically functions as a calcium channel blocker.