I found this interesting information (amongst others on crohns.net)
I've been taking probiotics off and on for a few months now and found them beneficial. In particular, the one I take is in pill form and contains 1 billion CFU (Lactobacillus acidophilus and Bifidobacterium lactis) Advanced 4-Strain.
I did find, after some trial and error, that I get better results taking the pill about 5-10 minutes before eating.
The Imuran treatment seems to be rolling along just fine. No problems yet, but I don't "feel" any difference than when I wasn't taking it. Only a scope will tell I guess.
So far so good.....stay the course.