Losartan Potassium is an angiotensin II receptor blocker (ARB) widely prescribed to manage high blood pressure (hypertension) and reduce the risk of stroke in patients with cardiovascular disease. By blocking the effects of angiotensin II, it helps relax blood vessels, lowering blood pressure and easing strain on the heart. It is also used to protect kidney function in patients with type 2 diabetes and proteinuria, slowing the progression of diabetic nephropathy. Additionally, losartan is prescribed for heart failure when other treatments are unsuitable. Its dual role in cardiovascular and renal protection makes it a vital therapy in long‑term care.