I am one of those who cannot tolerate mesalamine medications of any kind - I tried Asacol, Lialda, Rowasa enemas, and Colazol. Started out good - seemed to be helping the UC - THEN, I got flu-like symtoms minus the fever. Chills, nausea, muscle pain, and UC symtoms got worse after a few days with more blood and mucous. It took a while to convince my doctor I could not tolerate the 5 ASAs/ Seems I could tolerate small doses but not high enough to "work".
After a third scope (last one a sigmoid) in 18 months, he put me on prednisone and then 6MP. Found I could not take high enough dose of 6MP to be therapuetic (had blood tests to find out) - sooooo, that is when he sent me to another specialist with more experience. The new doctor weaned me off the prednisone (which I took for 5 months and it worked) and he put me on rectal steroid medication only - I used Cortifoam followed by Anusol suppository twice a day for a couple weeks and then every other day and taped down now to once a week or if I feel symptoms coming on. NO blood - very little mucous and occasional diarrhea since August. I do have IBS so that is affected also by what I eat (causing loose stool, etc.)
Hope this helps you some.
ElaineNY