Brand Names: Cozaar.
Definition: Losartan is a medication belonging to the angiotensin II receptor blocker (ARB) class, primarily used to treat hypertension (high blood pressure) and to protect the kidneys from damage caused by diabetes. It works by blocking the binding of angiotensin II to its receptors, which prevents blood vessels from narrowing and promotes vasodilation, thereby lowering blood pressure and improving blood flow. Additionally, it is frequently prescribed to reduce the risk of stroke in patients with high blood pressure and left ventricular hypertrophy, and to slow the progression of diabetic nephropathy in patients with type 2 diabetes.