My son was doing well in remission on 100mg of azathioprine but then his metabolites went through the roof and his appetite disappeared completely. He was taken off it then put on a lower dose but it is not enough to put him in remission and he has benn flaring for a few weeks now. His GI gave us the choice of methotrexate injections or imixiflab infusions. After much thought we chose methotrexate. He is to stop azathioprine today and gets his first injection tomorrow. He continues with omeprazole. He has not been at all good lately going three times a day with lots of pain and bleeding and most distressingly he has been suffering leaks, which started infrequently but now three times yesterday. What can we expect from methotrexate? How soon will it kick in? Will he be able to get to school each day? Will his hair fall out? If anyone has experience I would be grateful, thanks. He is 14 and coming up to important exams in school.