After being only on the Beta Blocker, Metoprolol 25 mg. x 3 daily, and not being afib free, my doctor put me on Flecainide in addition to the Metoprolol. After one week on Flecainide 50 mg. x 2 day and Metoprolol 25 mg. x 2 day, I went into afib at 11:05 am on 12/28 with the kind of ragged, wild, rapid heart beat I'd never had before. This one scared the hell out of me and, came close to going to the E.R. The only new variable was the Flecainide which I thought must have caused the rapid heart rate, I'd heard that some people take Flecainide to return the heart to Sinus (regular) rate so I took another one. I felt pretty bad the rest of that day but, converted to Sinus relatively quickly around 8:00 am the next morning. (My pattern is to convert to Sinus either the next or second day.) So, concluding that this event was caused by the Flecainide, I stopped taking it and went back to my earlier regimen of just Metoprolol 25 mg. x 3 daily. Then, only FIVE days later, on 1/2/19, I went into afib again around 2:30 am. I went back to the Metoprolol/Flecainide regimen and converted to Sinus on 1/4 at 2:00 am. (36 hours) My cardiologist has been out of the country for two weeks to return on Monday, Jan 7. I wonder what his observations and advice will be. I know that, if afib can't be blocked by meds, the next usual step is ablation.