I have a dog and cat and have done nothing differently with them since starting Imuran. I also have an 11 month old in daycare and visit him daily on my lunch hour - the other kids are always crawling all over me and I've been OK and haven't caught any colds or anything else, I just wash my hands a lot more.
My GI said the most common side effects from Imuran are abdominal pain, joint pain, nausea. He said it's extreme so you will know it if you have it, usually within the first few days after starting it. I have not had any side effects from the Imuran. (Pred is a different story.) I think the Imuran is starting to kick in for me because the last three days I have noticed more formed BM's, yahoo!