Cefazolin Pediatric Dose — Antimicrobial Reference
Cefazolin is a first-generation cephalosporin antibiotic that exerts bactericidal activity by inhibiting bacterial cell wall synthesis. It is widely used in pediatric practice for the treatment of susceptible gram-positive and select gram-negative infections, including skin and soft tissue infections, bone and joint infections, and surgical prophylaxis.
Pediatric Dosing
The recommended pediatric dose of cefazolin is 25–30 mg/kg/dose IV every 8 hours. The adult reference dose is 2 g IV every 8 hours; consult institutional protocol for weight-based maximum dose caps.
- Dose: 25–30 mg/kg/dose IV
- Frequency: Every 8 hours
- Route: Intravenous (IV)
Worked example: For a 20 kg child: 20 × 25 mg/kg = 500 mg to 20 × 30 mg/kg = 600 mg IV every 8 hours.
Indications and Clinical Context
Cefazolin is indicated for pediatric infections caused by susceptible organisms, including Staphylococcus aureus (methicillin-susceptible), Streptococcus species, and select gram-negative bacilli such as E. coli and Klebsiella pneumoniae. Common indications include skin and soft tissue infections, osteomyelitis, septic arthritis, urinary tract infections, and perioperative surgical prophylaxis. Its favorable safety profile and narrow spectrum make it a preferred first-line agent when susceptibility is confirmed or likely.
Cefazolin is classified as an antimicrobial/anti-infective agent. Dosing should be adjusted for renal impairment; consult institutional protocol for guidance in neonates and patients with significant renal dysfunction.
Administration and Monitoring
Cefazolin is administered intravenously. It may be given as an IV intermittent infusion typically over 15–30 minutes, or as a slow IV push per institutional policy. Intraosseous (IO) access may be used in emergent settings when IV access is unavailable. The adult ceiling dose is 2 g per dose; for larger pediatric patients approaching adult weight, consult institutional protocol to confirm maximum single-dose limits.
- Route: IV (preferred); IO in emergent circumstances
- Infusion: Typically over 15–30 minutes
- Adverse effects to monitor: Hypersensitivity reactions (rash, urticaria, anaphylaxis), elevated liver enzymes, Clostridioides difficile-associated diarrhea with prolonged use
- Contraindications: Known hypersensitivity to cefazolin or cephalosporins; use with caution in patients with documented severe penicillin allergy
- Renal dosing: Dose adjustment required in renal impairment — consult institutional protocol
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.