Cefdinir Dosing for 7-Year-Old, 20 kg Child
For a 7-year-old child weighing 20 kg, administer cefdinir 14 mg/kg/day, which equals 280 mg total daily dose, given as either 140 mg (approximately 2.8 mL of 250 mg/5 mL suspension) twice daily OR 280 mg (approximately 5.6 mL of 250 mg/5 mL suspension) once daily 1.
Dosing Calculation
- Weight-based dose: 14 mg/kg/day is the standard pediatric dose 1
- For 20 kg child: 14 mg/kg × 20 kg = 280 mg/day total
- Dosing frequency options:
- Twice daily: 7 mg/kg every 12 hours = 140 mg twice daily
- Once daily: 14 mg/kg every 24 hours = 280 mg once daily
Practical Administration Using Suspension
Using the 250 mg/5 mL suspension 1:
- Twice daily: 2.8 mL every 12 hours
- Once daily: 5.6 mL every 24 hours
Important: Once-daily dosing has been shown equally effective as twice-daily dosing for 10 days in respiratory infections 1. However, for skin infections, twice-daily dosing should be used as once-daily has not been studied in this indication 1.
Duration of Treatment
Treatment duration depends on the infection type 1:
- Acute otitis media: 5-10 days
- Acute sinusitis: 10 days
- Pharyngitis/tonsillitis: 5-10 days (10 days for once-daily)
- Skin infections: 10 days (must use twice-daily dosing)
Clinical Context from Guidelines
Cefdinir is listed as an alternative oral agent for β-lactamase-producing Haemophilus influenzae infections in pediatric community-acquired pneumonia 2, 3. The guidelines mention cefdinir alongside cefixime, cefpodoxime, and ceftibuten as alternatives when first-line agents (amoxicillin or amoxicillin-clavulanate) are not appropriate 2.
Key Considerations
- Food: May be administered without regard to meals 1
- Storage: After mixing, suspension remains stable for 10 days at room temperature; shake well before each dose 1
- Maximum dose: Do not exceed 600 mg/day regardless of weight 1
- Renal function: This child has normal renal function based on age; no adjustment needed 1
Common Pitfall
Do not underdose: The 14 mg/kg/day total dose is critical for efficacy. Some providers mistakenly give 7 mg/kg/day as the total daily dose rather than per-dose amount when using twice-daily regimen. The correct approach is either 7 mg/kg twice daily (total 14 mg/kg/day) OR 14 mg/kg once daily 1.