Ontario Registered Pharmacy Technician (RphT) Practice Exam

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Which of the following drugs is classified as a Calcium Channel Blocker?

Amlodipine
Atenolol
Enalapril
Nitroglycerin

The correct answer is: Amlodipine

Amlodipine is a calcium channel blocker because it relaxes and widens blood vessels by blocking the influx of calcium into muscle cells, leading to lower blood pressure. This mechanism is unique to calcium channel blockers and not found in the other options. Atenolol is a beta blocker and Enalapril is an ACE inhibitor, both of which work differently to lower blood pressure. Nitroglycerin is a vasodilator and does not block calcium channels. Therefore, it is not classified as a calcium channel blocker.