I was on high dose of Sotacor, 3x per day for almost 2 years. It stopped the a-fib completely. The cardiologist told me to lower the dose because he said that such a high dose could stop my heart!... But if I took slightly less, my heart would go into wild arrhythmia pounding and misfiring in my chest, feeling dizzy and air hungry. I started going to a gym every day except Sunday for 65 minutes; half hour on the treadmill and the rest strength and flexibility training. At the end of a month, bit by bit I was OFF the beta blockers. I kept up my exercise routine for 4 months and was cured! The cardiologist said it would come back but here I am 24 years later and I only have the very occasional blip if I have chocolate, coffee or alcohol...which I avoid like the plague.