Its a shame that you are taking that while the scientific community generally dismisses its effectiveness entirely. It barely registers above placebo. Have a number of friends who have recently completed medical school in the past few years. A few of them I still train with. They studied the use of ephedrine and other supplements extensively....They have the same general conclusion as mine;The side effects are not worth the minimal effect. "Ephedrine and ephedra promote modest short-term weight loss (≈0.9 kg/mo more than placebo) in clinical trials. There are no data regarding long-term weight loss, and evidence to support use of ephedra for athletic performance is insufficient. Use of ephedra or ephedrine and caffeine is associated with increased risk of psychiatric, autonomic, or gastrointestinal symptoms, and heart palpitations."