Known MRSA, injection drug use, antibiotics in past 3 months, vascular catheter, or medical device in situ

Empiric Therapy Dose Duration
Piperacillin-tazobactam 3.375-4.5g IV q6h 7-10 days
+    
Vancomycin 25-30mg/kg IV once then 15mg/kg IV q8-12h  

Severe penicillin allergy/anaphylaxis

Empiric Therapy Dose Duration
Ciprofloxacin 400mg IV q12h/750mg PO bid 7-10 days
+    
Vancomycin 25-30mg/kg IV once then 15mg/kg IV q8-12h  
+    
Metronidazole 500mg IV/PO q12h