General Info:

Zelnorm increases the action of serotonin (a body chemical) in the intestines. This speeds the movement of stools (bowel movements) through the bowels.

Zelnorm is used to treat severe, chronic, irritable bowel syndrome (IBS) in women who have constipation as their main bowel problem (constipation-predominant).

Zelnorm has not been shown to be helpful for men with irritable bowel syndrome.

Zelnorm should be taken twice a day on an empty stomach shortly before you eat a meal or as your doctor prescribes it.

If you experience an allergic reaction (difficulty breathing; closing of the throat; swelling of the lips, tongue, or face; or hives) to Zelnorm , stop taking this medication and seek emergency medical attention.

Diarrhea is an occasional side effect of Zelnorm . Most often, diarrhea has been reported during the first week of starting Zelnorm . Typically, diarrhea diminishes with continued therapy. If severe diarrhea, or diarrhea together with bad cramping, abdominal pain, or dizziness develops, contact your doctor.