Losartan Potassium Tablets IP 50 mg is an oral antihypertensive medication used to treat high blood pressure and protect kidney function in patients with type 2 diabetes and proteinuria. It belongs to a class of drugs called angiotensin II receptor blockers (ARBs), which work by relaxing blood vessels, reducing resistance, and lowering blood pressure. Losartan also helps reduce the risk of stroke and slows the progression of kidney damage.