How does quinapril work to treat high blood pressure?

Quinapril belongs to a group of medicines called angiotensin-converting enzyme (ACE) inhibitors. ACE is needed to make your blood vessels constrict, or become narrower. When you take an ACE inhibitor, one of the ways it reduces blood pressure is that it prevents the enzyme from doing its job, so your blood vessels are not as constricted. More relaxed blood vessels means that your blood pressure will be lower.

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