Premedicate. For a long trip, it's a good idea for IBS patients with diarrhea to take antidiarrheal medicines such as Imodium or Lomotil if they know they can tolerate it, says Crowe. Some people become too constipated with the drugs.
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Make sure your pre-travel diet includes plenty of fiber, which makes stools softer and more comfortable to pass. Foods high in fiber include many fruits, like apples (with the skin), raspberries, and pears; beans; and whole-grain foods such as bran cereal.