Common antibiotics used to treat an abscessed tooth include amoxicillin, penicillin, clindamycin, metronidazole and erythromycin, according to WebMD. A patient can take these antibiotics either in pill or liquid form, typically for seven to 10 days.
An abscessed tooth is a severe bacterial infection at the root of the tooth that usually causes intense pain. The most common cause of a tooth abscess is tooth decay, but it can also be the result of trauma or gingivitis, explains WebMD. A root canal or tooth extraction, commonly used in conjunction with the antibiotics, can treat the bacterial infection and prevent it from spreading. When using antibiotics, side effects can include nausea, vomiting, diarrhea and skin rash. Other serious side effects that may require immediate medical attention include hives, fainting, swelling of the face and throat, and trouble breathing.