Flecainide
"I am a 58 year old female who had two afib episodes in a 6 week period that did not stop until I was converted back to sinus rhythm in the ER. I had been on Metoprolol for two years but after the second afib incident, I was also put on 50mg of Flecainide two times a day. I have had no side effects except a lower heart rate, therefore my Metoprolol dosage had to be adjusted down to 25 mg. a day from 50."