Are there any medicines that work with UC but not CD

Mesalamines are not considered all that useful for Crohn's, because mesalamine is a topical med and the inflammation in Crohn's tends to involve all the layers of the bowel wall, not just the lining like in UC.

Not major difference. I have indermined colits and my GI says it does not matter as treatment is same. Main difference is in surgery. With UC you can have J-pouch but if it is crohn's colitis, you need stoma bag.

I am just wondering what made your diagnosis changed. I had first GI thought of crohns but my new GI thinks it is UC. He said I have continuous inflamation from rectum to traverse colon and it is diffused.I also had prometheus serology 7 said crohns and prometheus sgi says inconclusive.

I hear people diagnosis changed from UC to crohns very frequently but not other way so I am interested to konw.