I didn't know what it was... Someone said it was a corticosteroid with a coating that lets it get to its desired location (the colon) before it releases, maximizing its ability to decrease inflammation right where needed (again, the colon). I would suppose, though a pharmacist would have better knowledge, that its coating would likely not allow the small bowel pouch to absorb it, hence leaving it kind of worthless to us. And pouchitis isn't normally treated with steroids, anyway, like TE Marie said.