Anyone out there, when first put on this medication, hospitalized to watch for severe side effects? I have never taken any meds for my AF and am frankly, just scared to try it. Although I gather from most posts that the majority of people on flecainide have benefitted. At first my AF was severe and would happen walking across a room, and the ablations stopped that, but now it only happens when I over exert myself in the gym. So my thought process is just keep it at bay by not over doing the cardio and forget the medication. Any advice? I see my EP doc again Feb. 17 to possibly begin the flecainide. I also had open heart surgery for tricuspid valve replacement in 2002 due to rheumatic fever and a year or so after the open heart surgery is when the AF started.