For my husband he saw a marked difference after his second infusion. After the first one, he thought he felt better, but after the second one he was sure he felt better, and it also showed an improvement in the stool quality - from diarrhea, he was starting to have more formed stool.
Remicade has kept my husband stable now for about 3 years, and I'm hoping will last him a lot longer. I hope Remicade helps your son a lot, with no adverse effects. My hubby has a flu like reaction to remicade, where he gets fever, body and joint aches and pains for about 2 days following an infusion. After pre-medication with benedryl and solumedrol, those reactions are much less, and he just takes tylenol for any residual pain or fever. Feeling a little crummy 2 days out of every 8 weeks is a pretty good deal.
They gave my boy benedryl and tylenol pre infusion. my problem with measuring success, is that my boy doesn't really have symptoms. no D, no pain, no blood. rank gas on occasion, but that's it other than being smaller than other guys his age.