Pentasa is the mildest of the IBD medications and usually only provides relief to those with mild disease or those taking it as an adjunct to other therapy.
I took 8 pills a day years ago. I don't know if it did anything or not. I often hear the analogy that its like a topical cream like neosporin for the guts but won't help much if your guts are deeply inflamed at the inner levels.
I hated taking so many pills a day because I already took a bunch of other stuff but they are pretty blue pills lol. Hope it helps you.