Losartan is used in the treatment of hypertension (high blood pressure), the prevention of heart attack and stroke, and heart failure.
How Losartan works Losartan is an angiotensin receptor blocker (ARB). It relaxes blood vessels by inhibiting the action of a chemical that typically constricts them. This action lowers blood pressure, allowing blood to flow more smoothly to various organs and enabling the heart to pump more efficiently.
Common side effects of Losartan include dizziness, back pain, upper respiratory tract infection, nasal congestion, and cough.