When I was in highschool I took a lot of diet pills with ephedrine. I am just curious if any others out there also took it. I know that when I was on it my heart rate was elevated all the time. I also have read the studies correlating heart problems with CFIDS. I had to go on a halter monitor last week and my results came back saying I have a heart rate above 100 46% of the time with the high at 152 bpm, mean 110bpm. This with out any exercise, just simply laying, sitting and standing. I am just wondering if there could possibly be acorrelation between ephedrine and later onset of CFIDS.