arrhythmia
"I have found this medication at only 100mg to be highly effective in totally eliminating recurrent episodes of afibrillation even after an ablation procedure.  It is used by my doctor in conjunction with metoprolol (toprol XL 25 mg)to help regulate my heartbeat and keep it regular. The dose has already been reduced once from 200mg and my cardiologist hopes to be able to reduce it even further to 50mg.  No side effects that I have noticed."