Dosing Safety Assessment for Augmentin ES-600 in a 3-Year-Old
The prescribed dose of 6 mL twice daily of Augmentin 600 mg/5 mL for a 41-lb (18.6 kg) 3-year-old is safe and appropriate, delivering 143 mg/kg/day of amoxicillin, which falls within the FDA-approved high-dose range of 80-90 mg/kg/day for this formulation. 1
Dose Calculation and Verification
- Patient weight: 41 lb = 18.6 kg
- Prescribed dose: 6 mL twice daily (12 mL total daily)
- Amoxicillin delivered: 600 mg/5 mL × 12 mL = 1,440 mg/day
- Dose per kg: 1,440 mg ÷ 18.6 kg = 77.4 mg/kg/day 1
This dose is below the maximum recommended 90 mg/kg/day for Augmentin ES-600, making it safe from a toxicity standpoint. 1
FDA-Approved Dosing Parameters
The FDA label for Augmentin ES-600 specifies:
- Recommended dose: 90 mg/kg/day divided every 12 hours 1
- Age indication: Approved for pediatric patients ≥3 months 1
- Weight-based dosing table: For an 18.6 kg child, the FDA recommends approximately 9 mL twice daily to achieve the target 90 mg/kg/day 1
The prescribed 6 mL twice daily provides approximately 86% of the standard high-dose regimen, which remains therapeutically effective while potentially reducing gastrointestinal side effects. 2, 3
Clinical Context for High-Dose Therapy
High-dose amoxicillin-clavulanate (80-90 mg/kg/day) is indicated for: 4
- Children <2 years old
- Recent antibiotic exposure (within 30 days)
- Child care attendance
- Moderate to severe illness
- Geographic areas with high penicillin-resistant Streptococcus pneumoniae prevalence (>10%)
If this child meets any of these criteria, the prescribed dose is appropriate but slightly suboptimal—consider increasing to 9 mL twice daily (the FDA-recommended volume for this weight) to achieve full 90 mg/kg/day dosing. 4, 1
Safety Profile
- Clavulanate dose: 6 mL twice daily delivers 51.5 mg/day of clavulanate (2.8 mg/kg/day), well within the 6.4 mg/kg/day target for ES-600 formulation 1
- Gastrointestinal tolerance: The twice-daily ES-600 formulation has demonstrated significantly lower diarrhea rates (8.7-9.6%) compared to three-times-daily conventional formulations (26.7%) 3
- Age appropriateness: This child at 3 years old is well within the approved age range (≥3 months) 1
Administration Recommendations
- Timing: Administer at the start of meals to minimize gastrointestinal intolerance and enhance clavulanate absorption 1
- Storage: Shake well before each use; refrigerate after reconstitution; stable for 10 days 1
- Duration: Typical treatment courses are 10 days for acute bacterial sinusitis and otitis media 4
Common Pitfalls to Avoid
- Do not substitute other Augmentin formulations (200 mg/5 mL or 400 mg/5 mL) for ES-600, as they contain different clavulanate ratios and are not interchangeable 1
- Avoid heat exposure: Improper storage in hot environments can degrade the antibiotic and lead to treatment failure 5
- Monitor for improvement: Children should show clinical improvement within 48-72 hours; lack of response warrants reassessment 4