You might try eating very lightly for a couple of days ahead - liquids or very low-residue foods. Then if your GI approves, some Imodium or Lomotil before you go in.
Moderate to severe left-sided UC diagnosed 2001.
Current meds are Colazal, Azathioprine and Remicade. Completely off steroids for more than a year now! In remission since April, 2006. Remicade has been my wonder drug.
Now tapering Azathioprine, please pray for me.