I haven't been able to take them long enough to see if they work for tachycardia, due to the side effects. I've been prescribed Cardizem
CD now, and we'll see how that goes. My guess is that it will do the same as the others, due to the fact that I naturally have low blood pressure. They made me dizzy, floaty feeling, visual problems, shakey, cold, SO tired, and off balance.
My heartrate sits between 120 - 160+ bpm for the majority of the time.