I'm on Asacol HD right now, after being on Pentasa and Entocort. Asacol has worked better then Pentasa for me, due to where the medication was being released. It has cut my frequency of bathroom trips in half, along with decreasing urgency but still has yet to put me in remission of any sort. I'm having weight loss issues still, as well as severe joint issues and am going for a colonoscopy endoscopy Thursday, before moving on to immunosuppressants and or biologics.
Melasamine whether asacol pentasa..etc, is a great choice for mild to moderate crohns, at least as being a "safe" drug. My only real side effect from both pentasa and asacol has been hair thinning/ stop growing completely, though I've known people who never experience this. Other then that no complaints!