supraventricular tachycardia
"Was diagnosed with Supraventricular tachycardia two weeks ago and was put on Toprol 25 mg a day. It didn't work with bringing down my pulse so doctor increased to 50 mg a day until I see my heart doctor. I have to say that I do not like the side effects. Heavy feeling in my chest, tired all the time, headaches, etc.  Hope my doctor recommends ablation because I don't think I can take this medicine much longer."