Benevolent advice your specialist before taking any remedy. Dull Name: losartan (loe SAR tan) Brand Names: Cozaar What is losartan? Losartan is in a social event of meds called angiotensin II receptor rivals. Losartan keeps veins from narrowing, which cuts down circulatory strain and upgrades circulation system. Losartan is used to treat (hypertension) and to reduce the peril of stroke in people with hypertension. Losartan is moreover used to treat kidney issues in people with sort 2 diabetes. Losartan may similarly be used for purposes other than those recorded in this arrangement guide.