princesscolon, I'm not currently on Humira but, after seeing my GI Tuesday, he has decided not to keep me on Cimzia, now that it is approved and my clinical trial will be ending (just found that out on Monday), but to try Humira instead. I am currently on 6mp as well. My doctor did a Prometheus test on Tuesday to check my levels of 6mp. He said that they used to say it was okay to take 6mp and a biological together but that some studies came out last year that said you shouldn't be on both. He said some things now say it's okay and some don't, so he's checking my levels to see if they are even at the therapeutic level. If not, he is taking me off of the 6mp and keeping me on the biological. If my levels are therapeutic, we'll decide if it's worth the possible risk or not. This doesn't really answer your question, but just thought I'd share what he told me this week.