Metronidazole is an antibiotic and antiprotozoal medication used to treat various infections, particularly those caused by anaerobic bacteria and certain parasites. It is commonly prescribed for conditions such as bacterial vaginosis, trichomoniasis, and gastrointestinal infections like Clostridium difficile. Metronidazole works by disrupting the DNA of microorganisms, ultimately leading to their death. It is available in oral, topical, and intravenous forms.