My cardiologist wants me on amlodipine my nephrologist has recommended nifedipine. Can anyone tell me the difference? Im sick to death of all these BP meds! I was on atenolol for over 20 years with no side effects ever but for some reason my pulse dropped to 43 so i have been taken off it. I feel terribly anxious, bad tempered and ive only taken one dose 5mg of the amlodipine. Anyone?? please give me advice. I do believe atenolol has a calming influence and now im off it i just feel bad. I also finally was taken off the candesartan (atacand) which is a diabolical drug.