Augmentin is a penicillin antibiotic. Augmentin contains a combination of amoxicillin and clavulanate potassium. Amoxicillin is an antibiotic in a group of drugs called penicillins. Amoxicillin fights bacteria in the body.
Clavulanate potassium is a form of clavulanic acid, which is similar to penicillin. Clavulanate potassium fights bacteria that is often resistant to penicillins and other antibiotics.