Quinapril is a blood pressure medication. High blood pressure makes the heart and arteries work harder. If it persists for an extended period of time, the heart and arteries may fail to operate correctly. This can cause damage to the blood arteries in the brain, heart, and kidneys, leading to a stroke, heart failure, or kidney failure. Quinapril works by lowering blood pressure and aids in the prevention of strokes, heart attacks, and kidney problems. Quinapril is an ACE inhibitor, which is a kind of medication. It works by reducing specific molecules that restrict blood arteries, allowing blood to flow more freely and the heart to pump blood more effectively.