Cefoxitin Pediatric Dose — Antimicrobial Dosing Guide
Cefoxitin is a second-generation cephalosporin with broad-spectrum activity that includes anaerobic coverage, making it particularly useful in polymicrobial and intra-abdominal infections. It exerts its bactericidal effect by inhibiting bacterial cell wall synthesis via binding to penicillin-binding proteins. In pediatric practice, cefoxitin is commonly used for the treatment of intra-abdominal infections, peritonitis, and other serious infections requiring anaerobic coverage.
Pediatric Dosing
| Indication | Dose | Frequency | Adult Reference Dose |
|---|---|---|---|
| Standard infections | 30 mg/kg IV per dose | Every 8 hours | 1 g IV every 8 hours |
| Serious infection / Peritonitis | 30 mg/kg IV per dose | Every 6 hours | 2 g IV every 6 hours |
The per-kilogram dose remains 30 mg/kg regardless of severity; dosing interval is shortened to every 6 hours for serious infections and peritonitis to achieve greater drug exposure.
Worked example: For a 20 kg child with peritonitis: 20 kg × 30 mg/kg = 600 mg IV every 6 hours. For a standard infection in the same child: 600 mg IV every 8 hours. Consult institutional protocol for weight-based maximum single-dose capping.
Indications and Clinical Context
Cefoxitin is indicated for pediatric patients requiring antimicrobial coverage that spans gram-negative aerobic organisms as well as anaerobes, particularly Bacteroides fragilis. Its primary utility lies in intra-abdominal infections such as complicated appendicitis and peritonitis, where polymicrobial flora including anaerobes are expected pathogens. It may also be used for skin and soft tissue infections, pelvic infections, and other serious bacterial infections in appropriate clinical contexts.
The escalation to every-6-hour dosing for serious infections or peritonitis reflects the pharmacodynamic principle of time-dependent bacterial killing characteristic of beta-lactam antibiotics, maximizing the time that free drug concentrations remain above the minimum inhibitory concentration. Antibiotic selection and duration should align with local susceptibility patterns and institutional antimicrobial stewardship guidelines.
Administration and Monitoring
Cefoxitin is administered intravenously. Each dose should be infused over 15–30 minutes as an intermittent IV infusion; direct IV push is generally avoided due to the risk of infusion-related reactions. Ensure IV or IO access patency prior to administration. As with all cephalosporins, obtain a thorough allergy history, particularly regarding penicillin hypersensitivity, noting the low but documented rate of cross-reactivity.
- Route: Intravenous (IV) administration as specified; consult institutional protocol for IO use in emergent settings.
- Monitoring: Renal function (cefoxitin is renally cleared; dose adjustment may be required in renal impairment — consult institutional protocol).
- Adverse effects: Hypersensitivity reactions, thrombophlebitis at infusion site, transient elevation of liver enzymes, and gastrointestinal disturbance.
- Contraindications: Known hypersensitivity to cephalosporins or serious penicillin allergy.
- Max dose: Not specified in source — consult institutional protocol for single-dose capping guidance.
Disclaimer: This article is an educational reference summarizing standard pediatric dosing values. It is not a substitute for clinical judgment. Always verify doses against institutional protocols, the current edition of authoritative references (e.g., Lexicomp, Harriet Lane Handbook, PALS guidelines), the patient’s accurate weight, and any patient-specific factors (renal/hepatic function, allergies, comedications) before administration.