Nature Clarity Keto Angiotensin-converting enzyme (ACE)inhibitors ACE inhibitors are chemical compounds that narrow arteries in the kidneys, as well as throughout the body. ACE is an abbreviation for angiotensin-converting enzyme. ACE inhibitors contribute to lesser production of angiotensin by the body, which helps blood vessels relax and open, which, in turn, reduces blood pressure. There are generic drugs, for example, benzazepril hydrochloride, lisinopril and others, and common trade names, for example, zestril, monopril and others.