Losartan potassium is primarily used in the treatment of high blood pressure (hypertension). It helps to relax blood vessels, allowing blood to flow more smoothly and reducing the strain on the cardiovascular system. This medication is also prescribed to lower the risk of stroke in patients with hypertension and an enlarged heart. Additionally, it is used in managing kidney disease in patients with type 2 diabetes and high blood pressure, as it helps to slow the progression of kidney damage. Losartan potassium is often part of a comprehensive treatment plan that may include lifestyle changes and other medications to effectively manage these conditions.