Hi Blueflame.
My diagnosis has also changed to indeterminate IBD just this last week, and I also have been researching different treatments for my condition.
From what I have been reading, the use of pentasa with another combined therapy is more for maintenance after the inflammation has been put into remission. Though, the pentasa is going to have to be combined with something much stronger in order to retain remission. However, you may also be taking it unnecessarily because the strength of pentasa is not enough to control the inflammation, and may be controlled with the stronger medication anyways. I was on pentasa enemas for about a year and a half, and it didn't even make a dent in my inflammation.
I know side-effects are a concern, but I'd rather have the inflammation controlled before thinking about maintenance of the disease. I guess for me, I'd rather go for something stronger to put the inflammation into remission as I have severe symptoms, absorption issues and unable to eat. I've been suffering for two years with these debilitating symptoms, so I can't even tell the difference between my illness and a side-effect anymore.
Good luck with your treatment. I hope you are able to find something quicker than I have.
-Rina