Antibiotic Regimens for Intraabdominal Sepsis

Treatment Recommendations

The World Journal of Emergency Surgery recommends meropenem 1g IV every 6h by extended infusion as the preferred first-line agent for patients with intraabdominal sepsis due to its broad spectrum of activity and effectiveness against resistant organisms 1
For septic shock, the World Journal of Emergency Surgery suggests initiating meropenem 1g IV every 6h by extended infusion, doripenem 500mg IV every 8h by extended infusion, imipenem/cilastatin 500mg IV every 6h by extended infusion, or eravacycline 1mg/kg IV every 12h (for patients with beta-lactam allergy) immediately upon diagnosis 1, 2
The Infectious Diseases Society of America recommends source control through surgical intervention or drainage as soon as possible for patients with intraabdominal sepsis 3, 4

The World Journal of Emergency Surgery recommends 4 days of antibiotic therapy for immunocompetent and non-critically ill patients with adequate source control, and up to 7 days for immunocompromised or critically ill patients based on clinical conditions and inflammatory indices 1, 4, 5
The Clinical Infectious Diseases journal suggests monitoring inflammatory markers (WBC, CRP, PCT) to guide duration of therapy 1, 4

For patients with beta-lactam allergies, the World Journal of Emergency Surgery recommends eravacycline 1mg/kg IV every 12h or tigecycline 100mg IV loading dose, then 50mg IV every 12h 1, 2
For patients at high risk for intra-abdominal candidiasis, the Praxis Medical Insights recommends considering adding an echinocandin (caspofungin, anidulafungin, or micafungin) 2

Delaying appropriate antimicrobial therapy increases mortality risk, necessity for reoperation, and prolongs hospitalization, according to the Praxis Medical Insights and Clinical Infectious Diseases 2, 6
Continuing antibiotics beyond 7 days when adequate source control has been achieved is not recommended by the World Journal of Emergency Surgery 4, 5, 7