What is the appropriate dose of Augmentin (amoxicillin/clavulanate) 250 mg/125 mg per 5 mL for a child weighing 30.9 kg?

Augmentin 250/5 Dosage for 30.9 kg Child

For a 30.9 kg child, the appropriate dose of Augmentin 250 mg/5 mL suspension depends on the indication and severity of infection, ranging from 7.5 mL twice daily (standard dosing) to 15 mL twice daily (high-dose therapy).

Dosing Algorithm Based on Clinical Scenario

For Mild-to-Moderate Infections (Standard Dosing)

• Dose: 45 mg/kg/day of amoxicillin component divided twice daily
• Calculation: 30.9 kg × 45 mg/kg/day = 1,390.5 mg/day ÷ 2 = 695 mg per dose
• Volume: Approximately 7 mL twice daily (350 mg amoxicillin per 5 mL = 490 mg per 7 mL)
• Indications: Uncomplicated otitis media, mild sinusitis, or simple skin infections in children without recent antibiotic exposure or daycare attendance 1

For Moderate-to-Severe Infections or Risk Factors (High-Dose Therapy)

• Dose: 90 mg/kg/day of amoxicillin component divided twice daily
• Calculation: 30.9 kg × 90 mg/kg/day = 2,781 mg/day ÷ 2 = 1,390.5 mg per dose
• Volume: Approximately 14 mL twice daily (250 mg amoxicillin per 5 mL = 700 mg per 14 mL)
• Indications: 1, 2
  • Children <2 years old
  • Daycare attendance
  • Recent antibiotic use (within 30 days)
  • Moderate-to-severe illness presentation
  • Geographic areas with high penicillin-resistant S. pneumoniae (>10% resistance)
  • β-lactamase-producing H. influenzae suspected

For β-Lactamase-Producing Organisms (Haemophilus influenzae)

When β-lactamase-producing organisms are suspected, the guidelines specifically recommend amoxicillin-clavulanate at either:

• 45 mg/kg/day in 3 doses (standard), OR
• 90 mg/kg/day in 2 doses (high-dose) 1, 2

For this 30.9 kg child with the 250/5 formulation, use 14 mL twice daily to achieve high-dose coverage.

Critical Considerations

Formulation Limitations: The standard Augmentin 250 mg/5 mL suspension contains a lower clavulanate ratio than the ES-600 formulation. For optimal coverage of resistant organisms, particularly in severe infections, consider:

• The ES-600 formulation provides 600 mg amoxicillin/42.9 mg clavulanate per 5 mL 3
• Standard 250/5 formulation may require higher volumes to achieve therapeutic amoxicillin doses
• Maximum clavulanate exposure should not exceed recommended limits to minimize gastrointestinal side effects

Common Pitfalls to Avoid:

1. Underdosing in heavier children: Studies show primary care physicians frequently prescribe significantly lower-than-recommended doses in children >20 kg, with mean doses of only 40.4 mg/kg/day versus the recommended 80-90 mg/kg/day 4
2. Not adjusting for resistance patterns: In areas with >10% penicillin-resistant S. pneumoniae, standard dosing fails to achieve adequate sinus fluid concentrations 5
3. Improper storage: Heat exposure significantly degrades amoxicillin-clavulanate stability; ensure refrigeration after reconstitution 6

Duration of Therapy: Administer for 10 days for acute otitis media or sinusitis, 5-7 days for uncomplicated pneumonia 1, 5

Administration: Give at the start of meals to minimize gastrointestinal intolerance and enhance clavulanate absorption 3