I have been on Lialda for a year and a half. At first, I thought it got me out of my 'at that time' worst flare of my life. But it really just relieved me of the extreme urgency, cramping and diarrhea. I still had blood and mucus everyday. I also occasionally found whole pills in my stool. This past January, my UC came back full force. Seemingly everyday, I found 3-4 of the Lialda in my stool. And it's not just that I saw the pills there, but they still were completely covered in their thin maroon shell. I.e. I was receiving no benefit.
I kept taking the Lialda up until two weeks ago. Even with the nightly Canasa it is doing nothing for me. My symptoms have not changed since I stopped. I am in a full-blown flare.