I'd probably check with your doc to get his opinion. Some say it is OK, others not. I think using it sparingly is fine, which is what I do. Two a day might cause some problems, but I know others who do that and are fine.
Dx Left-sided UC Dec. 2006
Azathioprine (Imuran) 125mg/day
Prednisone 2.5mg/day (trying to taper-started at 60 6/1)
Multivitamin, B complex vit., fish oil, calcium, fiber supplement, probiotic