This is a medication (steroid) similar to Prednisone but is released only at the terminal ileum and colon. Because it does not circulate through your entire body, like Prednisone, it is much less problematic. You can also go off it without tapering. I started on Budesonide when I was first diagnosed but I had problems with it. I had an allergic reaction for some reason, plus it didn't seem to do much. Prednisone was then prescribed and it was very successful in stopping the flare, despite some of the less pleasant side effects (moon face!) I think that if Budesonide works it is good. Like Prednisone, the goal is not to stay on Budesonide, but to treat a flare with it.
Once a flare is over the Pentasa you are taking should keep things under control, so keep taking it. I am largely under control with Salofalk (same as Pentasa) and have only had to do steroids twice, thank goodness.