Which of the following medications is classified as a calcium channel blocker?

Nifedipine is indeed classified as a calcium channel blocker. This group of medications works by inhibiting the influx of calcium ions into the smooth muscle cells of the myocardium and vascular smooth muscle. This leads to relaxation of these muscles, resulting in vasodilation and subsequently lowering blood pressure. Calcium channel blockers, like nifedipine, are commonly used to manage conditions such as hypertension and certain types of angina.

In addition to nifedipine, verapamil is another example of a calcium channel blocker, as it also works through the same mechanism. This highlights the importance of recognizing multiple medications within a class and understanding their therapeutic uses and side effects. Propranolol, on the other hand, is a beta-blocker and works primarily by blocking beta-adrenergic receptors, impacting heart rate and contractility rather than calcium influx. Hydralazine is a direct vasodilator that works through a different mechanism, acting on peripheral arterioles without involving calcium channels. Recognizing the specific classifications of these medications aids in understanding their effects on the cardiovascular system.