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There are very few side effects associated with lactulose. However, belching, bloating, flatulence, diarrhea, vomiting, nausea and stomach discomfort or pain are fairly common side effects, and need not be reported unless they bother you. If you experience severe or ongoing diarrhea or if you notice any signs of an allergic reaction (i.e. difficulty breathing, hives, or swelling in the face, tongue, lips, or throat), you should stop taking lactulose and contact your doctor immediately.
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