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.