I used to take prozac off and on over 20 years., but since i have gotten older, i have trouble with it affecting my heart rate, as i am over 60 now. I still have some trouble with depression and someone suggested the Sam-e supplement. Will it affect my heart rhythm as the SSRI's have in the past year? I am 68 years old now and really need something for my mood. Please advise or give information. thank you!