I used Flecainide for three months after ablation, and suffered a great deal with constipation. Also had vision issues, and heart pounding. I was taken off of it two days ago, and now I am having big problems with palpitations. I think they should have tapered me off it but did not. Can’t get them to call me back. Terrible patient service. I was on Sotalol for over 15 years. It worked pretty good. But not good if you have asthma.