Metronidazole is an antibiotic.
It’s used to treat skin infections, rosacea and mouth infections (including infected gums and dental abscesses). It’s used in the treatment of conditions such as bacterial vaginosis and pelvic inflammatory disease.
It’s also used to treat infected insect bites, skin ulcers, bed sores and wounds, and to treat and prevent bacterial and parasitic infections.
Metronidazole is only available on prescription.
It comes as a tablet, gel, cream, a liquid you drink or a suppository which is a medicine that you push gently into your anus. It’s also given by injection, but this is usually only done in hospital.
Source: NHS UK