Propafenone
"I'm 56 yr old male, active and I was dignosed with afib about 20 months ago. When it first started I thought it was anxiety and didn't go to doctor until I had an episode that lasted 9 hours.
After 2 months of tests doctor put me on 150 mg twice a day. After 7/8 months it was 3 times a day because episodes were almost everyday and getting worse. After 12 months it was 225 twice an 150 one time a day and I was still having episodes everyday. Told him that and was told to learn to live with it.
New doctor put me on 325ER 2 times per day an after 1 week called and said worst week I have had in a year. I'm now on 425 twice a day for last 8 weeks. I have episodes every day still, some days worse than others. Have more tests  scheduled for next week"