I saw your questions about your young son with UC. I'm sorry to hear that one so young is dealing with UC. Many hugs out to him and to you :)
I thought I'd try to answer at least one of your questions.
Hair loss due to imuran or other meds will usually decrease with time or with stopping the meds. I've lost hair because of prednisone and it's come back - a couple of times. Sometimes the hair loss is due to the fact that the body is fighting the fight and just doesn't have the resources to deal with hair.
Pan-colitis and GERD diagnosed May 2003
Asacol 12 per day, Azathioprine 75mg, Rowasa and Canasa as needed
Aciphex, Effexor XR, BCP, Rhinocort nasal spray
Forvia and a Probiotic
Osteopenia (hip and spine) from prednisone use. Started Azathioprine because I was steroid dependent.
Co-Mod for the UC forum