Cammy, is Colazal an option in your health system? Some of us who don't tolerate Pentasa and Asacol are helped by Colazal.
I was on Azathioprine for several years, now off because I'm on Remicade. It did help me, although it didn't get me into full remission. The only side effect I had was problems with yeast infections. You'll need to watch for infections and be sure to clean and protect cuts, because it works by lowering your immunity.
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.