Which medication is classified as a beta blocker?

Carvedilol is classified as a beta blocker, which is a type of medication primarily used to manage various cardiovascular conditions, such as hypertension and heart failure. Beta blockers work by blocking the effects of the hormone epinephrine (adrenaline) on beta receptors, which results in a decrease in heart rate and blood pressure. This mechanism not only helps to improve symptoms in patients with heart disease but also provides protective effects against complications.

In contrast, the other medications listed in the options serve different purposes. Warfarin sodium is an anticoagulant that prevents blood clots, clopidogrel is an antiplatelet agent often used to reduce the risk of heart attacks and strokes, and cyclobenzaprine hydrochloride is a muscle relaxant used to relieve muscle spasms. None of these act on beta receptors or exhibit the typical beta-blocking effects that characterize carvedilol.