arrhythmia
"I have been taking this for only 1 week and my side effects are hard to deal with. I am very tired and my pulse dips to the 40s. I am taking 400mg 2 times a day so hopefully at my follow up the Dr will reduce it.My chest hurts on and off but that could be due to 3 cardio-versions in 6 weeks time. I have had A-fib episodes for the last 5 years so this is my last medicine to try. So far it is working. I feel the familiar flutters and then...nothing. I am glad it is keeping my rhythm intact."