I'm in the usa and i get generic "Mesalamine DR" from my local riteaid pharmacy. It's made by zydus pharmaceuticals out of NJ. It's a $10 copay as a generic without the need for a discount card with my insurance. I got a prescript
ion for asacol and it's a generic for it. Here's a link with more info to bring to your pharmacist.
www.zydususa.com/product-details/?id=216Besides that, they're older generics like balsalazide disodium (colazal), Olsalazine (Dipentum) and Sulfasalazine.