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Metronidazole antibiotic blister pack. This antibiotic drug is used in the treatment of anaerobic bacterial infections, particularly psuedomembranous colitis, a severe infection of the colon. Pseudomembranous colitis is caused by the bacterium Clostridium difficile. It usually occurs after the normal gut flora has been destroyed by a course of antibiotics, allowing Clostridium difficile to flourish.
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