Most often isolated organisms are Escherichia coli, Klebsiella pneumonia, and anaerobes, especially Bacteroides fragilis
Pathogenicity of Enterococci remains unclear and specific coverage is not routinely suggested for community-acquired infections
Ertapenem 1g IV once daily OR
Metronidazole 500mg IV q8hrs PLUS
Ciprofloxacin 400mg IV q12 hrs OR
Levofloxacin 750mg IV q24hrs OR
Ceftriaxone 1g IV q24hrs
Ciprofloxacin 400mg IV q12 hrs OR
Levofloxacin 750mg IV q24hrs OR
Ceftriaxone 1g IV q24hrs
Examples of complication include severe sepsis or hemodynamic instability
Vancomycin 15-20mg/kg PLUS any of the following options
Options:
Metronidazole 500mg IV q8hrs PLUS Ciprofloxacin 400mg IV q12hrs
Piperacillin/Tazobactam 4.5g IV q8hrs
Imipenem/Cilastin 500mg IV q6hrs
Doripenem 500mg IV q8hrs
Meropenem 1g IV q8hrs
GI antibiotics
Sepsis antibiotics
GU antibiotics
Antiemetics
Proton-pump inhibitor
Analgesics and sedatives 
OB/GYN antibiotics
Biliary ultrasound