Angiotensin converting enzyme (ACE) is an enzyme produced in the body to help regulate blood pressure. ACE inhibitors expand blood vessels and decrease resistance by lowering levels of angiotensin II. Allows blood to flow more easily and makes the heart's work easier or more efficient. Commonly prescribed include: Benazepril (Lotensin), Captopril (Capoten), Enalopril (Vasotec), Fosinopril (Monopril), Lisinopril (Prinivil, Zestril), Moexipril (Univasc), Peridopril (Aceon), Quinapril (Accupril), Ramipril (Altace) and Trandolapril (Mavik)