Which of the following medications is a calcium channel blocker?

All three medications listed—Norvasc, Felodipine, and Nifedipine—are classified as calcium channel blockers. These are a group of medications that work by inhibiting the influx of calcium ions into the smooth muscle cells of the heart and blood vessels, leading to relaxation of these muscles. This mechanism is particularly beneficial for treating conditions such as hypertension and certain kinds of angina, as it helps to lower blood pressure and reduce the workload on the heart.

Norvasc, the brand name for amlodipine, is often prescribed for high blood pressure and chest pain. Felodipine is another medication in this class that is primarily used to manage hypertension. Nifedipine is frequently used in the treatment of hypertension and angina as well. Given that all these medications share the same mechanism of action as calcium channel blockers, the correct answer encompasses all of them.

This classification is key in pharmacology, as it informs treatment choices based on the specific cardiovascular condition being addressed.