I've been on Asacol since January 30 and Rowasa since February 6. I was in a horrible flare (diarrhea 15+ times a day). By February 6, the Asacol had started to make a small difference, but I noticed a big improvement when I started Rowasa...virtually overnight. Then I kind of stagnated for a week/week and a half. Then this the weekend I started improving again and have been steadily improving since.
So, I really can't say how long the Asacol took to start working. I think it depends on how bad your inflamation is and how well the Asacol works in your system. I think I read on their website that it can take up to three weeks. Just remember that the Asacol may be working in terms of reducing the inflamation, but that it may take a while for the inflamation to heal enough to also reduce your symptoms.
Have you asked your doctor about
a rectal med? I really doubt I'd be doing as well as I am if I weren't using Rowasa.
Symptoms began in November 2008, ~4 weeks after giving birth to my son.
Eased for ~3 weeks in December, possibly b/c of probiotic use?
Returned in January 2009 (with a vengeance), diagnosed with pancolitis on January 30.
Currently taking Asacol (400mg 4 pills 3x daily), Rowasa nightly, Culturelle probiotic, and Zoloft (25 mg).