Cammy, that's exactly what Asacol did to me. They're both mesalamine, so it makes sense. You may want to revisit the meds with your doctor. It usually takes 3-6 months for the azathioprine to be effective, and that's a pretty low dose of prednisolone to try to control things until it begins working.
I'm guessing Colazal isn't available as a choice within your health care system since your doctor hasn't mentioned it. That's too bad because several of us who don't tolerate mesalamine do well on Colazal.
Hope you find the right combination very soon. I know exactly what you're going through, and no one deserves that!
UC Forum Moderator
Moderate to severe left-sided UC (21 cm) diagnosed 2001.
Asacol, Rowasa, Pentasa, Prednisone, Entocort, Azathioprine
Colazal, Remicade, Nature's Way Primadophilus Reuteri.
In remission since April, 2006. Remicade has been my wonder drug.