aminosalicylate aminosalicylate an aminosalicylate is a class of medications that is often used to treat ulcerative colitis and crohn's disease. the class includes among others: 4-aminosalicylic acid balsalazide olsalazine sulfasalazine mesalazine (5-aminosalicylic acid) side effects may include abdominal pain, diarrhea, headaches, and nausea.