Metronidazole is an antibiotic and antiprotozoal medication primarily used to treat infections caused by anaerobic bacteria and certain parasites. It is commonly prescribed to treat bacterial infections such as bacterial vaginosis, trichomoniasis, and certain types of gastrointestinal infections caused by Clostridium difficile. Metronidazole works by disrupting the DNA and cellular processes of bacteria and parasites, leading to their death. It is available in various formulations, including tablets, capsules, creams, gels, and intravenous solutions.