Cefuroxime Dosing
For adults with normal renal function, administer cefuroxime 750 mg to 1.5 grams IV every 8 hours; for children >3 months, use 50-100 mg/kg/day divided every 6-8 hours, with mandatory dose reductions based on creatinine clearance in renal impairment. 1
Adult Dosing (Normal Renal Function)
The FDA-approved dosing varies by infection severity 1:
- Uncomplicated infections (UTI, skin/soft tissue, uncomplicated pneumonia): 750 mg IV every 8 hours
- Severe/complicated infections: 1.5 grams IV every 8 hours
- Life-threatening infections or less susceptible organisms: 1.5 grams every 6 hours
- Bacterial meningitis: Up to 3 grams every 8 hours (maximum dose)
- Bone/joint infections: 1.5 grams every 8 hours
Treatment duration is typically 5-10 days, though Streptococcus pyogenes infections require minimum 10 days to prevent rheumatic fever or glomerulonephritis 1.
Pediatric Dosing (>3 Months of Age)
Standard dosing: 50-100 mg/kg/day divided every 6-8 hours 1
- Use the higher end (100 mg/kg/day) for severe infections, not exceeding maximum adult dosage
- Bone/joint infections: 150 mg/kg/day divided every 8 hours (not exceeding adult maximum)
- Bacterial meningitis: 200-240 mg/kg/day IV divided every 6-8 hours
For neonates <7 days: 30 mg/kg every 12 hours; >7 days: 30 mg/kg every 8 hours 2. However, recent evidence suggests critically ill pediatric patients may experience underexposure with standard regimens, particularly those with augmented renal clearance 3.
Renal Impairment Adjustments (Adults)
Mandatory dose reduction is required when renal function is impaired 1:
| Creatinine Clearance | Dose | Frequency |
|---|---|---|
| >20 mL/min | 750 mg - 1.5 grams | Every 8 hours |
| 10-20 mL/min | 750 mg | Every 12 hours |
| <10 mL/min | 750 mg | Every 24 hours* |
*Cefuroxime is dialyzable; give an additional dose after hemodialysis 1.
The elimination half-life increases dramatically with declining renal function: from 1.4 hours (normal) to 16.8 hours (CrCl <15 mL/min) 4. Renal clearance correlates linearly with creatinine clearance 5, 6.
Renal Impairment in Pediatrics
For children with renal insufficiency, modify dosing frequency consistent with adult recommendations 1. The volume of distribution remains stable (~0.82 L/kg) regardless of renal function, but systemic clearance decreases proportionally with creatinine clearance 4.
Critical Considerations
Augmented Renal Clearance (ARC)
Recent data reveals that standard dosing achieves poor target attainment (<20%) in patients with CrCl >80 mL/min/1.73 m² 3. Consider:
- Four times daily dosing schedules
- Continuous infusion for severe infections
- Therapeutic drug monitoring when available
Common Pitfalls
- Failing to adjust for renal impairment: Even mild impairment (CrCl 30-80 mL/min) results in moderate underexposure with standard dosing 3
- Overlooking ARC in critically ill patients: Younger patients and those with sepsis may require higher/more frequent doses 3
- Inadequate duration for Streptococcus pyogenes: Must complete minimum 10 days 1
Pharmacokinetic Properties
- Peak serum concentration after 750 mg IM: ~27 mcg/mL at 45 minutes 1
- Peak after 750 mg IV: ~50 mcg/mL at 15 minutes 1
- Serum half-life: ~80 minutes (normal renal function) 1
- Protein binding: ~50% 1
- Renal excretion: 89% over 8 hours 1
Surgical Prophylaxis
- Clean-contaminated procedures: 1.5 grams IV 30-60 minutes before incision, then 750 mg every 8 hours if prolonged 1
- Open heart surgery: 1.5 grams at anesthesia induction, then every 12 hours for total of 6 grams 1
The evidence strongly supports using FDA-approved dosing as the foundation, with adjustments for renal function being non-negotiable to prevent both toxicity and treatment failure.