I was put on Cordarone(amiodorone) for Afib and Flutter. It did absolutely nothing to help and I was told it may have made things worse. I think the risks of amiodorone are too high.
"The Cordarone brand name has been discontinued in the U.S. If generic versions of this product have been approved by the FDA, there may be generic equivalents available."

Warning
"This medicine is only used to treat abnormal heartbeats that may be deadly. It may cause severe and sometimes deadly side effects like lung, thyroid, or liver problems. This medicine can also cause the abnormal heartbeats to get worse. If you have questions, talk with the doctor."

I have since had severe Afib and gone into Vtac. I am now on my 2nd pacemaker and taking metoprolol succinate 150mg once a day. I was scheduled to have an ablation but the the doctor found that it was on the left side and they couldn't do it that day. So they did a Cardio-conversion three years ago. I had been on Matoprolol tartrate but my insurance took it off their formulary. I had severe fluid retention 2 years ago and that caused lots of heart problems with my CHF. I was hospitalized and went into Vtac. They immediately sent me to the Heart Hospital of our Med Center and with treatment I lost almost 50 lbs of fluid in one week. I have been Afib and Flutter free since then. Although I do get breathless during any activity but that is due to Stage 4 severe CKD.