In the 54-year-old male patient’s regimen, which medication is a calcium channel blocker?

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Calcium channel blockers work by preventing calcium from entering smooth muscle cells in the vessel walls, which relaxes the vessels and lowers blood pressure. Amlodipine is a dihydropyridine calcium channel blocker, so its primary action is on vascular smooth muscle to cause vasodilation. The other drugs listed do not block calcium channels: cetirizine is an antihistamine, ramipril is an ACE inhibitor, and indapamide is a diuretic. Therefore, the medication acting as a calcium channel blocker is amlodipine.