NiceCupOfTea said...
I thought the reason why mesalazines didn't work for Crohn's was because Crohn's affects all layers of the bowel and mesalazines can't reach that far - they only work on the inner lining of the bowel (which is fine for UC, which only affects the inner lining, but not for Crohn's)...
That's a reasonable explanation; but since it's not even known how mesalamines work for UC, it's not surprising that it's not known why they *don't* work for Crohn's. So it's probably too oversimplified to say it like that, but it's probably fine for explaining it to the average patient.