This is the only drug that has worked to control my a-fib. I like it, but in high doses, I had lots of
side effects like constipation, urinary retention, low blood pressure, low blood sugar and sinus tachycardia. The lower dose has worked pretty well and I do not have as many side effects. I have heard that it controls PVC's very well in some people. I think the reason it works for me is because it controls vagally-mediated a-fib.