· Generic name: losartan [ loe-SAR-tan ] Brand name: Cozaar Drug class: Angiotensin receptor blockers. Medically reviewed by Sanjai Sinha, MD. Last updated on Sep 30, 2021. Uses; Warnings; Before taking; Dosage; Side effects; Interactions; FAQ; What is losartan? Losartan belongs to a group of drugs called angiotensin II receptor antagonists. It keeps blood ….