Penicillin G 2-4 mu IV q4-6h
OR
Penicillin V 500 mg IV q8h
PLUS
Metronidazole 500 mg PO/IV q8h
ALTERNATIVELY, CONSIDER
Ampicillin/sulbactam 1.5-3 g IV q6-8h
Amoxicillin/clavulanate 500/125 mg PO q8h
Clindamycin 600 mg IV q6-8h (or 450 mg PO q6-8h)
Streptococci
Actinomyces spp.
Oral spirochetes