Metronidazole is an antibiotic used to treat a wide variety of infections caused by certain types of germ (anaerobic bacteria) and types of micro-organisms called protozoa. These types of organisms often cause infections in areas of the body such as the gums, pelvic cavity and tummy (stomach or intestines) because they do not need oxygen to grow and multiply.
This is a companion discussion topic for the original article at https://patient.info/medicine/metronidazole-for-infection-flagyl