Avoid using Asacol HD for more than six consecutive weeks., Do not use Asacol HD if you are allergic to salicylates or any of the ingredients found in Asacol HD., If you have liver or kidney disease, you should talk to your doctor about the risks of using Asacol HD., Discuss all of your current medications with your physician before starting Asacol HD., There might be risks associated with using Asacol HD if you are pregnant, intend to become pregnant, or are breastfeeding. Discuss the risks with your physician before starting Asacol HD., Your colitis symptoms might worsen after starting Asacol HD. If you experience any of the following symptoms, contact your doctor: Cramping Abdominal Pain Bloody Diarrhea Fever, Cramping, Abdominal Pain, Bloody Diarrhea, Fever Cramping, Abdominal Pain, Bloody Diarrhea, Fever