I have sleep apnea, low blood pressure and already had a heart rate of 64. So after a few months on Metoprolol I blacked out one morning after an Afib episode during sleep and I broke my leg in the collapse. I now have a pacemaker to keep my heart rate at or above 60. I also have gained 30 pounds and can only walk 50 yards without stopping to rest. Before starting Flecainide and Metoprolol I could walk 36 holes of golf.
But I rarely get afib. I think that's due to the Flecainide.