I Was Just Out On Coversyl Low Dosage To Replace

i was just out on coversyl low dosage to replace my Valsartan hct 160/25 mg. How long will it take it to lower my blood pressure like the Valsartan did, my Doc says the coveryl is the best. Reason for the change is my Potasium was extremely low as I was even taking Potasium pills 600 mg per day on my own without him directing me to...