Metronidazole 200mg/400mg is an antibiotic and antiprotozoal medication commonly used to treat various infections caused by anaerobic bacteria and certain parasites. It works by inhibiting the growth of bacteria and protozoa by interfering with their DNA, effectively preventing their replication. Metronidazole is frequently prescribed for conditions such as bacterial vaginosis, pelvic inflammatory disease, giardiasis, trichomoniasis, and infections caused by anaerobic bacteria in the gastrointestinal tract, skin, and other body systems. It is often available in tablet form for oral administration, and the dosage varies based on the type and severity of the infection being treated.