How long does it take to lower your blood pressure with lifestyle changes? I am 27. There is a history of heart disease in my father s family. 2 months ago my blood pressure(B.P.) was 151/102 the last two weeks it has ranged from 125/80 - 138/88 usually closer to 134/85. I have lost over 20 pounds in this time period (from 252-230). My doctor wants to put me on medication and I feel like my B.P. is still lowering and is near or below 130/80 so why should I go on medication now?