Question: what is the difference in losartan and valsartan?
Answer: The main differences between losartan (Cozaar) and valsartan (Diovan) are: Losartan has a shorter duration of action (length of time it works for) at lower dosages than valsartan. Research1 indicates losartan lasts less than 24 hours at dosages of 25mg a day and 50mg a day.