Complicated:

  • distal colon surgery

  • ascending cholangitis/hepatic/pancreatic infection

  • prosthetic intravascular device

  • chronic illness

  • immunosuppression

Empiric Therapy Dose Duration
Piperacillin-tazobactam 3.375-4.5g IV q6h See Duration

Penicillin allergy

Empiric Therapy Dose Duration
Ceftriaxone 2g IV daily See Duration
+    
Metronidazole 500mg IV/PO q12h  
+/-    
Vancomycin 25-30mg/kg IV once then 15mg/kg IV q8-12h  

Cephalosporin allergy

Empiric Therapy Dose Duration
Ciprofloxacin 400mg IV q12h/500mg PO bid See Duration
+    
Metronidazole 500mg IV/PO q12h  
+    
Vancomycin 25-30mg/kg IV once then 15mg/kg IV q8-12h