it appears that NTRIF 550 may be a brand name for a tablet containing Rifaximin 550 mg. Rifaximin is a broad-spectrum antibiotic that acts locally in the gastrointestinal tract.
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Traveler's diarrhea caused by non-invasive Escherichia coli strains
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Hepatic encephalopathy (a liver-related brain dysfunction)
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Irritable Bowel Syndrome with Diarrhea (IBS-D)
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Infectious diarrhea
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It's important to follow your doctor's directions when taking medicine
