Clindamycin, doxycycline, metronidazole and penicillin are antibiotics commonly prescribed by dentists to treat gum disease. These antibiotics are more commonly known under the brand names Cleocin, Periostat and Flagyl, according to WebMD.
Gum disease can be caused by bacteria found in plaque. Antibiotics kill the bacteria found in plaque, which helps fight and reduce gum disease and infection, advises WebMD.
Antibiotics are delivered by several different methods such as medicated mouthwash, pill form and topical form. In more advanced cases of gum disease, antibiotics can be administered directly into the gum pockets, says WebMD. Toothpastes can also be medicated to fight bacteria in the mouth when used regularly.