Penicillin G 2-4 mu IV q4-6h
PLUS
Metronidazole 500 mg IV q6h
ALTERNATIVELY, CONSIDER
Ceftriaxone 2 g IV q24h
Metronidazole 500 mg PO/IV q8h
Piperacillin/Tazobactam 4.5 g IV q8h
Meropenem 0.5-1 g IV q8h
OR
Imipenem 500 mg IV q6h
Clindamycin 600 mg IV q6h
Fusobacterium necrophorum
S. viridans or other streptococci
Staphylococci
Peptostreptococci
Bacteroides spp.
Oral anaerobes