Losartan is an active pharmaceutical ingredient (API) primarily used to treat high blood pressure (hypertension), helping to reduce the risk of strokes and heart attacks. It works by relaxing blood vessels, allowing blood to flow more easily. Additionally, it is prescribed to protect the kidneys in patients with type 2 diabetes and high blood pressure, slowing the progression of kidney disease. In some cases, it is also used to manage heart failure, improving symptoms and increasing survival rates. Losartan is often part of a long-term treatment plan.