Yes, ceftriaxone IV can be given as a once-daily (OD) dose
Ceftriaxone is specifically designed for once-daily intravenous administration and is FDA-approved for this dosing schedule across most indications. This is one of its key clinical advantages over other cephalosporins.
FDA-Approved Dosing
The FDA label explicitly supports once-daily dosing 1:
- Adults: 1-2 grams IV once daily (or divided twice daily) depending on infection severity, maximum 4 grams/day
- Pediatric patients:
- Skin/soft tissue infections: 50-75 mg/kg once daily (max 2 grams)
- Serious infections: 50-75 mg/kg once daily or divided every 12 hours (max 2 grams)
- Meningitis: 100 mg/kg/day once daily or divided every 12 hours (max 4 grams)
- Neonates: 50-75 mg/kg once daily (with specific age-based adjustments) 2
Clinical Evidence Supporting Once-Daily Dosing
Pharmacokinetic Rationale
Ceftriaxone's long half-life (approximately 8 hours in adults) and high protein binding make it ideal for once-daily administration 3. The drug maintains therapeutic concentrations above the MIC for susceptible organisms for 12-24 hours, supporting the once-daily regimen 1.
Specific Clinical Scenarios
For Infective Endocarditis: The 2015 AHA guidelines explicitly recommend ceftriaxone 80 mg/kg/day IV every 24 hours (up to 4 grams daily) as an alternative to divided dosing 4. In adults, 4 weeks of once-daily ceftriaxone achieves a 98% bacteriologic cure rate 4.
For Meningitis: Once-daily dosing is supported but with important caveats 5:
- In the first 24 hours, twice-daily dosing is preferred to achieve rapid CSF sterilization
- After 24 hours, once-daily dosing can be used and achieves similar CSF sterilization rates
- Recent pediatric data shows 100 mg/kg once daily achieves better probability of target attainment (88%) compared to 50 mg/kg twice daily (53%) for common meningitis pathogens 6
For Pneumonia: Once-daily dosing is effective 7. However, recent data suggests 2 grams once daily is superior to 1 gram once daily for severe pneumonia requiring mechanical ventilation 8.
For Outpatient Parenteral Therapy (OPAT): Once-daily dosing is particularly advantageous, allowing home IV therapy with a single daily infusion 4, 5, 3.
Important Administration Details
- Infusion time: Administer over 30 minutes in adults and children 1
- Neonates: Administer over 60 minutes to reduce risk of bilirubin encephalopathy 1
- Do NOT use calcium-containing diluents (Ringer's, Hartmann's) due to precipitation risk 1
Clinical Pitfalls to Avoid
Underdosing in sepsis: For adult patients with sepsis and normal renal function, 1 gram once daily is insufficient—use 2 grams once daily 9
Meningitis in first 24 hours: Start with twice-daily dosing for rapid CSF penetration, then transition to once-daily 5
Staphylococcus aureus meningitis: Neither once nor twice-daily dosing achieves adequate CSF concentrations for S. aureus (MIC 4 mg/L) 6
Neonatal contraindications: Do NOT use in hyperbilirubinemic neonates or premature infants, and never co-administer with IV calcium-containing solutions in neonates ≤28 days 1
Comparative Efficacy
Once-daily ceftriaxone 2 grams is clinically and bacteriologically equivalent to twice-daily cefotaxime 2 grams every 12 hours for serious infections 10. The once-daily regimen offers practical advantages for outpatient therapy and patient convenience without compromising efficacy.