How Does Quinapril Work?Quinapril is part of a class of drugs called ACE inhibitors. ACE stands for angiotensin-converting enzyme. Quinapril helps to block the angiotensin-converting enzyme, which is normally part of a reaction in the body that causes blood vessels to narrow (constrict). By blocking this enzyme, quinapril causes blood vessels to relax, which can lower blood pressure.
By helping blood vessels relax, quinapril also increases the efficiency of the heart. This means that the heart does not have to work as hard and more blood can be pumped out to the rest of the body. Both of these are helpful for a person with congestive heart failure.
Off-Label Quinapril UsesOn occasion, your healthcare provider may recommend quinapril for treating a condition other than those listed above. This is called an "off-label" use. One off-label quinapril use is the treatment of kidney problems in people with scleroderma, which is hardening and thickening of the skin.