There are different manufacturers of the different types of contrasts that are used. Sometimes, people react badly to one brand but not another. The severity of the reaction also dictates how future CTs procede. If you had a mild reaction, then it might be possible to have them try a different brand of contrast in the future. I would call and get the brand name of the contrast that was used on you. Then you can discuss trying a different brand with your doctor. And yes, prednisone and benadryl are the treatments used when one needs a CT in the future after having a mild reaction.
your drainage - Exactly where is the drainage coming from? Your rectum? Or is it a separate area?
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CD, Ankylosing Spondylitis, lupus, small fiber peripheral neuropathy, avascular necrosis, Sjogren's ?