Augmentin 875/125 mg BID is NOT appropriate for this child
For a 64.32 kg child with acute otitis media, the prescribed dose of Augmentin 875/125 mg twice daily provides only 27.2 mg/kg/day of amoxicillin, which is substantially below the recommended 80-90 mg/kg/day for pediatric AOM treatment. 1
Dosing Analysis
The current prescription delivers:
- Amoxicillin: 1,750 mg/day ÷ 64.32 kg = 27.2 mg/kg/day
- This is approximately one-third of the guideline-recommended dose
Correct Dosing for This Patient
According to AAP guidelines 1:
- Target dose: 80-90 mg/kg/day of amoxicillin in 2 divided doses
- For 64.32 kg: This equals 5,146-5,789 mg/day total
- Per dose: 2,573-2,895 mg twice daily
The standard adult Augmentin 875/125 mg tablet formulation cannot achieve pediatric dosing requirements for this weight. This child requires high-dose amoxicillin-clavulanate suspension (90 mg/kg/day amoxicillin with 6.4 mg/kg/day clavulanate in a 14:1 ratio) 1, though children weighing ≥40 kg may transition to adult dosing if appropriate.
Key Clinical Considerations
When to Use Amoxicillin-Clavulanate vs. Amoxicillin Alone
High-dose amoxicillin-clavulanate is specifically indicated for 1:
- Children who received amoxicillin in the previous 30 days
- Concurrent purulent conjunctivitis (otitis-conjunctivitis syndrome)
- Desired coverage for β-lactamase-producing H. influenzae or M. catarrhalis
Duration of Therapy
7 days is acceptable for children ≥6 years with uncomplicated AOM 1. However, 10 days remains standard for younger children or severe cases.
Common Pitfalls
- Using adult tablet formulations for pediatric weight-based dosing: Adult tablets (875/125 mg) are designed for fixed adult dosing, not pediatric mg/kg calculations
- Underdosing amoxicillin: Subtherapeutic dosing (27 mg/kg/day vs. 80-90 mg/kg/day) risks treatment failure, especially against penicillin-resistant S. pneumoniae 2
- Incorrect clavulanate ratio: The 14:1 amoxicillin-to-clavulanate ratio minimizes diarrhea while maintaining efficacy 1, 3
Recommended Action
Prescribe high-dose amoxicillin-clavulanate suspension at 90 mg/kg/day (amoxicillin component) divided twice daily for 7-10 days. For this 64.32 kg child, this equals approximately 2,895 mg amoxicillin twice daily. If suspension is impractical due to volume, consider:
- Multiple adult tablets to achieve target dose (e.g., three 875 mg tablets BID = 2,625 mg BID, which approximates 82 mg/kg/day)
- Alternative: High-dose amoxicillin alone (80-90 mg/kg/day) if no risk factors for β-lactamase producers exist 1
The FDA label confirms that experience with Augmentin ES-600 (the high-dose pediatric formulation) in children ≥40 kg is limited, and adults requiring high doses should not substitute pediatric suspension for tablets 3. This creates a dosing gap for heavier children requiring weight-based dosing.