Fosinopril sodium is the sodium salt of fosinopril, a synthetic phosphinic acid derivative and angiotensin-converting enzyme (ACE) inhibitor used as a pharmaceutical reagent and active ingredient in medications. It is primarily used in the treatment of high blood pressure (hypertension). It works by relaxing blood vessels, which helps to lower blood pressure and improve blood flow. This medication is also prescribed to manage heart failure, as it reduces the workload on the heart and enhances its efficiency. In some cases, it is used to improve survival rates after a heart attack. Additionally, it may be used in patients with chronic kidney disease to help slow kidney deterioration. By inhibiting the angiotensin-converting enzyme (ACE), it prevents the production of a substance that narrows blood vessels, thereby aiding in maintaining cardiovascular health. Always taken under medical supervision, it is part of a comprehensive treatment plan that may include diet, exercise, and other medications.