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Rifaximin, marketed under the name Xifaxan, is an antibiotic used primarily to treat diarrhea caused by E. coli, often referred to as "traveler's diarrhea," in individuals aged 12 and older. Additionally, it is prescribed for adults to manage irritable bowel syndrome with diarrhea (IBS-D) and to prevent hepatic encephalopathy, a brain condition arising from liver disease. The medication functions by inhibiting bacterial growth through preventing the bacteria from producing essential proteins needed for their survival. Rifaximin is taken orally, typically 2 to 3 times daily, based on the specific health condition being treated. Common side effects may include swelling, dizziness, and fatigue. It is important to use this antibiotic only as prescribed to avoid resistance and ensure effectiveness. Always consult with a healthcare professional before beginning any new medication.