Hi Nana glad to here that your grandson is doing great i thought he would,as for your questions will he go through withdrawl coming of predisone i'm pretty sure there will be no withdrawl but there will be hot flushes and mood swings E.T.C but coming of the Cotin that is alittle harder but there weaning him of slowly so he shouldn't have many withdrawl problems except some sweating,hot-flashes,joint pain,and the feeling of having the flu but if he wasn't on it that long he should have no problems at all i hope he doesn't. It sounds like he is out of the woods now he is on a good immune fighting drug that has helped so many people,i'm one of those people that my body just refuses to go into remmission but so far the Humira has really helped me alot its been almost 4 months now and i feel pretty good except the low iron and blood. Please tell your grandson to keep his head up he will come through this and it will make him stronger for it and you to Nana. Your Friend Jenn