I am a 24 year old female who was recently diagnosed with Inappropriate Sinus Tachycardia. I have been on 100 mg of Toprol XL
for about one month now. My symptoms were major exercise intolerance, high resting heart rate and spells of tachycardia, fatigue, shortness of breath, profuse sweating, dizziness and blackout spells. The medicine seems to help more than any other I have been on. However, I am wondering about its side effects.