Ceftriaxone Dosing in Children
For most pediatric infections, ceftriaxone should be dosed at 50-75 mg/kg/day given once daily or divided every 12 hours, with a maximum daily dose of 2 grams; for meningitis, use 100 mg/kg/day (maximum 4 grams daily) given once daily or divided every 12 hours.
Age-Specific Dosing
Neonates (≤28 days old)
Critical Warning: Ceftriaxone should NOT be used in hyperbilirubinemic neonates due to risk of bilirubin encephalopathy. Intravenous doses must be infused over 60 minutes in neonates to reduce this risk 1.
- Postnatal age ≤7 days: 50 mg/kg/day given every 24 hours 2
- Postnatal age >7 days and ≤2000 g: 50 mg/kg/day given every 24 hours 2
- Postnatal age >7 days and >2000 g: 50-75 mg/kg/day given every 24 hours 2
Infants and Children (>28 days old)
Standard infections (skin/soft tissue, pneumonia, UTI, sepsis):
Meningitis:
- Initial dose: 100 mg/kg (not to exceed 4 grams) 1
- Maintenance: 100 mg/kg/day (maximum 4 grams daily) given once daily or divided every 12 hours 2, 4, 1
- Duration: 7-14 days typically 1
Acute bacterial otitis media:
- Single dose: 50 mg/kg IM (maximum 1 gram) 1
Gonococcal infections:
- Children <45 kg: 25-50 mg/kg IM/IV single dose (maximum 250 mg) 5, 6
- Children ≥45 kg: Use adult dosing 6
Condition-Specific Dosing from Guidelines
Severe Infections (WHO Guidelines)
- Dysentery: 50-80 mg/kg daily for 3 days 7
- Meningitis: 50 mg/kg twice daily for 7-10 days 7
- Typhoid: 80 mg/kg daily for 5-7 days 7
- Pneumonia (second-line): 80 mg/kg daily for at least 5 days 7
Febrile Infants (8-60 days old)
- UTI (22-60 days): 50 mg/kg/dose every 24 hours IV or IM 8
- No focus identified: 50 mg/kg/dose every 24 hours IV or IM 8
- Bacterial meningitis (29-60 days): 100 mg/kg/day once daily or divided every 12 hours IV 8
Once Daily vs. Twice Daily Dosing
For meningitis, once-daily dosing (100 mg/kg) achieves superior early CSF penetration compared to twice-daily dosing (50 mg/kg every 12 hours). Recent pharmacokinetic modeling demonstrates that once-daily dosing achieves 88% probability of target attainment at 24 hours versus only 53% for twice-daily dosing, though both reach 100% at steady state 9. This supports using 100 mg/kg once daily for empirical meningitis treatment 9, 10.
Administration Guidelines
Intravenous:
- Infuse over 30 minutes in children 1
- Infuse over 60 minutes in neonates (mandatory to reduce bilirubin encephalopathy risk) 1
- Concentrations between 10-40 mg/mL are recommended 1
Intramuscular:
Critical Contraindications and Warnings
- Hyperbilirubinemic neonates: Absolute contraindication 2, 1
- Calcium-containing solutions: Never mix or co-administer due to precipitation risk 1
- Premature infants: Use with extreme caution; prolonged half-life (19 hours vs. 8.4 hours in adults) requires careful monitoring 11
Pharmacokinetic Considerations
- Neonatal clearance is reduced: Elimination half-life is 15.7-25.5 hours in neonates <4 days old versus 8-9 hours in older children 11, 12
- No renal adjustment needed: Dosing remains unchanged even with renal impairment up to 2 g/day 1
- CSF penetration: Achieves 20.1% serum-to-CSF uptake in inflamed meninges 9
- Protein binding: 85-95% bound (decreases with higher concentrations) 1
Duration of Therapy
- Most infections: 4-14 days 1
- Meningitis: 7-14 days (may extend to 3 weeks for complicated cases) 2, 8, 1
- Streptococcus pyogenes infections: Minimum 10 days 1
- Surgical prophylaxis: Single dose 0.5-2 hours preoperatively 1
The evidence strongly supports once-daily dosing for most pediatric infections due to ceftriaxone's long half-life, with twice-daily dosing reserved only for specific severe infections where institutional protocols dictate 2, 9, 10, 13.