Valsartan
"When I took Diovan with HCTZ, it took a couple of weeks to get my blood pressure down to 125/80.  I am an active 61 year old male that plays tennis and walks 40 minutes a day. Then my health plan would only cover the generic valsartan with HCTZ. It was fine. Lately, my valsartan was made by a generic manufacturer McLeod's.  All of a sudden my blood pressure shot up to 180/100.  I now have to take 5 mg. amlodipine to get my blood pressure normal."