Common antibiotics for dental infections include erythromycin, amoxicillin, penicillin, clindamycin and metronidazole, according to WebMD. Dentists and doctors routinely give the antibiotics orally in a liquid or pill form for seven to 10 days. Typical side effects of these medicines include skin rash, diarrhea, nausea and vomiting.
Patients who experience side effects such as breathing problems or swelling of the tongue, face, lips or throat should call 911 or seek emergency medical help, notes WebMD. Patients must take their medications for the prescribed period to kill the bacteria completely. Even when patients feel better, if they do not finish their prescriptions, bacteria that do not die early during treatment can become stronger and reduce the antibiotic effect. Antibiotic resistance can develop when patients do not use antibiotics properly or when they overuse them.