atrial fibrillation
"I had a pacemaker installed in December 2006 for a very slow heart rate but had constant Atrial fibrillation so the doctor started me on Sotalol in 2007.  I did not notice any side effects and have not had an atrial fibrillation attack since then. I no longer worry about my heart and it beats nice and steady.  For me it was a miracle!  My sister tried it for her heart flutters and could not tolerate it so I guess it would depend on your condition."