Dose is calculated using the ampicillin component.
Max 2000 mg/dose (ampicillin) · Duration: 3–6 weeks · Adjust according to clinical and radiological response; longer courses may be required
Enter weight on Kids to calculate doses
Ceftriaxone • i.v. • 50–75 mg/kg/day • 1×/day
Max 2000 mg/day · Duration: 3–6 weeks · Adjust according to clinical and radiological response; longer courses may be required
• Ceftriaxone + clindamycin: preferred alternative when anaerobic coverage is essential or ampicillin/sulbactam is unsuitable.
• Piperacillin/tazobactam: severe or polymicrobial abscess, healthcare-associated infection, or failure of first-line therapy.
• Meropenem: suspected ESBL-producing organisms, life-threatening infection, or per ICU protocol when carbapenem is indicated.
• Add vancomycin when MRSA is suspected or proven; consider percutaneous drainage for abscesses >3 cm or poor response.
Enter weight on Kids to calculate doses
Clindamycin • i.v. • 10–10 mg/kg/dose • 3×/day
Max 600 mg/dose · Duration: 3–6 weeks · Step down to p.o. when clinically stable; essential anaerobic and S. aureus coverage
Enter weight on Kids to calculate doses
Clinical notes
• Lung abscess requires prolonged antibiotic therapy guided by clinical and radiographic response — typical total duration 3–6 weeks.
• Obtain blood and respiratory cultures before antibiotics when feasible; tailor therapy to culture results and local resistance.
• Step down from i.v. to p.o. when clinically stable, afebrile, tolerating oral intake, and inflammatory markers are improving.
• Percutaneous drainage or surgical intervention is indicated for large cavities, failure to improve despite adequate antibiotics, or threatened rupture.
• Reassess imaging during therapy; extend duration if cavity persists, empyema coexists, or clinical response is slow.
• AAP Red Book — Pneumonia and Antimicrobial Therapy (2024)
• PIDS/IDSA Clinical Practice Guideline — Pediatric CAP (principles applicable) (2011)
