Which drug is an example of an ACE inhibitor?

Lisinopril is an example of an ACE inhibitor, a class of medications used primarily to treat high blood pressure and heart failure. ACE inhibitors, or angiotensin-converting enzyme inhibitors, work by blocking the conversion of angiotensin I to angiotensin II, a potent vasoconstrictor. This leads to the relaxation of blood vessels, reduced blood pressure, and decreased workload on the heart.

In addition to being effective for hypertension, ACE inhibitors like lisinopril have been shown to offer protective benefits to the kidneys, particularly in diabetic patients, and can improve survival rates in patients with heart failure. The efficacy of lisinopril and other ACE inhibitors in managing these conditions emphasizes their importance in clinical practice and pharmacotherapy.

The other options listed—metoprolol, amlodipine, and sildenafil—belong to different classes of medications. Metoprolol is a beta-blocker, amlodipine is a calcium channel blocker, and sildenafil is a phosphodiesterase type 5 inhibitor. While each of these medications serves specific purposes in cardiovascular or erectile function management, they do not function as ACE inhibitors.