No. They didn't say outright not to, but when I was afraid to go off my Asacol after getting on Imuran, they told me it could cause liver problems. Or maybe they were just trying to scare me off the Asacol lol
I was on Asacol and Imuran for about
a year. My doctor or pharmacist didnt warn me of any extra dangers regarding taking those meds. I was told that Imuran is an antisuppressant and so is pred so I should be careful as far as that goes but nothing else.
Also as another poster mentioned, your urine will be extremely yellow or orange while on sulf.