Reasons for: my doctor wants to change me to Norvasc. And I was told by numerous of others that it is a powerful formula. Well, I have good blood pressure readings at home 108/66. And I am currently on Losartan, but when I go to my doctors appointment it goes up like 150/78. I personally me think its an error reading I don't want to take Norvasc, 5mg I feel as if It may bottom out please help..