Physicians may prescribe the generically named drug mesalamine in the treatment of Crohn's disease or ulcerative colitis, both classified as inflammatory bowel diseases. The medicine, sold in the United States with several brand names including Asacol, functions to decrease inflammation as well as other types of symptoms. People with ulcerative colitis experience sores and redness inside the colon while Crohn's disease sufferers have deep bowel inflammation. Both produce pain and other symptoms. Only less common and rare serious side effects occur with the use of Asacol. If any symptoms seem severe or do not stop, consult a physician.
Cramps
Taking Asacol can induce cramps in the stomach or abdomen, but for most people who get these non-serious common side effects, the pain from such cramps should feel mild. Cramps occur as the person's body adjusts to the drug and should cease to bother the person as acclimation occurs.
Diarrhea
Typically during initial use of Asacol, people taking it may experience diarrhea caused by a change in the balance of fluids in the stools. Such disturbances do not continue in most people after adjustment to Asacol, and diarrhea is mild in most cases. Temporary constipation may also occur with the use of Asacol.
Pain
Minor pain such as headaches or pain in the joints and muscles can occur with the use of Asacol. Patients may feel pain in the back or in the throat or the ears. Pain also may occur in the rectum, but none of these common side effects classifies as serious and they do not generally require medical treatment.
Flu-Like Symptoms
Along with the aforementioned pain in the throat, Asacol may induce other side effects that appear as symptoms of the flu. It may cause a runny nose, known as rhinitis, as well as congestion in the sinuses and chest. It can induce a cough, sneezing, a fever and chills, as well. Flu-like symptoms do not necessarily indicate a serious problem exists because of taking Asacol.
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