Metronidazole 400 mg is an antibiotic and antiprotozoal medication commonly prescribed in Australia to treat a variety of bacterial and parasitic infections. It is often used for conditions such as dental infections, skin infections, pelvic inflammatory disease, bacterial vaginosis, and gastrointestinal infections caused by certain bacteria or parasites. The medication works by stopping the growth of harmful microorganisms, helping the body eliminate the infection. Metronidazole 400 mg tablets are usually taken with food to reduce stomach upset and should be used exactly as directed by a healthcare professional.