Allergic reactions are also possible. If you develop an unexplained rash, hives, itching, or breathing difficulties during treatment with Asacol, contact your healthcare provider right away.
(Click Asacol Side Effects and Asacol Warnings and Precautions to learn more about potentially dangerous reactions to this drug. These articles also cover more safety precautions to be aware of before starting treatment and what to do if serious problems occur.)