Cozaar is an angiotensin II receptor (type AT1) antagonist used to treat high blood pressure by working to prevent the narrowing of blood vessels. It is used for the treatment of hypertension. It may be used alone or in combination with other antihypertensive agents including diuretics. Cozaar is also used in Patients with Left Ventricular Hypertrophy and Nephropathy in Type 2 Diabetic Patients. Cozaar’s generic name is Losartan Potassium.