I'm curious as to what kind of affects your father experienced after being off the drug for a few days? Amiodarone levels are still present for up to a year after stopping the drug; so technically, he still has plenty of the drug in his system to go on for a pretty long time. It doesn't make too much sense that he would be feeling any affects at all after just a few days. If your father had an ICD placed, I would also wonder why he would have to be on any drugs anyway. The ICD is placed to prevent any type of life threatening arrhythmia, which is why he was probably placed on Amiodarone in the first place. With the ICD placed maybe he doesn't need to be on any drugs at all. I would certainly ask about that.
I too was alarmed by the effects of Amiodarone risks. After 10 months of the drug I decided to stop taking it on my own. I told my doctor of this decision and he understood my concerns. The drug worked wonders for the svts, but I was too frightened by what I read about this drug. It would be a wonder drug if it didn't carry all the baggage with it. At any rate, my doctor told me that if my symptoms return to the magnitude they were at when I started the amiodarone, he would prescribe something different. To date (6 months since this) I haven't had any episodes that would warrant any notice of svts. I know that ablation will be the next step for me. But to answer your question, yes, there are alternative drugs for this. Ask his doctor about those. I wish I had a name for one, but I haven't had the need yet.
I hope and pray you can get some help with this.
Ally †