Key takeaways
Losartan (Cozaar) and valsartan (Diovan) are both angiotensin II receptor blockers (ARBs) used to treat high blood pressure, but they have some key differences. Losartan is also used to lower the risk of stroke in people with high blood pressure and thickened heart walls, and to slow kidney problems in people with Type 2 diabetes. Valsartan, on the other hand, is used to lower the risk of serious heart-related problems in adults with heart failure or after a heart attack. Both medications are available as lower-cost generics and are typically taken once daily, though valsartan can also be taken twice daily depending on the condition being treated. Common side effects for both include dizziness and fatigue. Additionally, both medications can raise potassium levels and are not safe to use during pregnancy. The choice between the two often depends on your specific health needs and your prescriber's preference.
