I am on Remicade and imuran also (imuran is also called "azathioprine"). I too used to be just on Remicade, which worked well for me; however, my GI had me meet with a doctor who does research solely on Crohn's treatments, and he said that using imuran while on Remicade helps the Remicade to do its job better--thus, healing my insides more completely, which lowers my risk of colon cancer in the future. That convinced me that being on it in addition to Remicade is worthwhile.
You said you can't tolerate 6MP--I believe imuran is similar, though I could be wrong. Perhaps ask your doc. about
this med? I have been on the combo for about
a year now, and feeling well.