Polymicrobial
Cefazolin 2gm IV q8h
PLUS
Metronidazole 500mg IV q8h
OR
Piperacillin/tazobactam 4.5gm IV q6-8h
If given as q8h, to be given as extended infusion (over 3-4 hours)
Ciprofloxacin 400mg IV q12h
Clindamycin 450-600mg IV q8h