You can read about amiordarone if you google the correct syntax. It's pretty much the biggest hammer there is for arrhythmias. It's also quite toxic, and has to be carefully monitored.

The way it usually works is that there is initially a 'loading dose' of between 600 and 800 mg for about a week. That means two potent tablets each day for a week. Then, you go on a maintenance dose that might be weight-dependent, not sure about that, but in my case if was 400 mg, so 200 mg BID. Depending on your condition, and its recent treatment (in my case it was a week after my first, or index, ablation, and I went into intractable and rapid AF), I kept the maintenance dose for three weeks, after which I was to taper with a single 200 mg tablet PO for two more weeks. Your prescription might be considerably longer for reasons I don't know.

The drug really works. I wasn't keen to begin taking it, but the alternative was AF upwards of 180 bpm. Nobody can live at that rate for long, so amiodarone it was. It is potentially dangerous for the lungs and for the kidneys, as examples, so the ideal strategy would be to maintain you on the drug until you can be corrected via catheter ablation or a pacemaker, or some other strategy that will allow your heart to function quasi-normally without it.