i am currently contacting my cardiologist about metoprolol problems. i have been a competitive runner and mountain biker for some years now. i’m 82 and experienced atrial flutter a couple months ago. was prescribed 100mg metoprolol which was immediately reduced to 50mg because i take prozac. still i experience fatigue and leg pain constantly. my resting pulse which has always been low (upper 40’s) now sits at 38-39. it is difficult to run or bike due to constant washed out feeling and leg pain. this appears to be a common problem.