Remicade is the best way to get heal fistula's but we are all different. I had problems in my 3rd infusion but it was rare. Most people if they get past the 3rd or 4th infusion, it will most likely work for them. Yes the cost is high. Here in Canada it is $4,100 a in infusion and I forget how many infusions there are right off. I was on it 3 or more years ago so I forget. There are risks but there is with any medication, as is surgery. What is your main concern?
Hope it works for your son, and he gets relief. Keep us posted. When is the remistart to begin? Hang in there!