Fosinopril is an angiotensin-converting enzyme (ACE) inhibitor used to treat high blood pressure and heart failure. It works by blocking the production of angiotensin II, a substance that causes blood vessels to narrow and increases blood pressure. By relaxing blood vessels, fosinopril helps lower blood pressure, improve blood flow, and reduce the workload on the heart. Unlike other ACE inhibitors, fosinopril is eliminated by both the liver and kidneys, making it a suitable option for patients with kidney impairment.