Augmentin Dosage for 5-Year-Old with Otitis Media
For a 5-year-old child weighing 40 lbs (18.2 kg) with acute otitis media, prescribe Augmentin (amoxicillin/clavulanate) at a dose of 45 mg/kg/day of the amoxicillin component divided into two daily doses, which equals approximately 410 mg twice daily for 10 days.
Weight Conversion and Dose Calculation
- 40 lbs = 18.2 kg 1
- The high-dose amoxicillin/clavulanate regimen is 45 mg/kg/day (amoxicillin component) divided twice daily 2, 3
- For this child: 18.2 kg × 45 mg/kg/day = 819 mg/day total, or approximately 410 mg twice daily 1
Rationale for High-Dose Amoxicillin/Clavulanate
Amoxicillin is the first-line antibiotic for acute otitis media, but when using amoxicillin/clavulanate (Augmentin), high-dose formulations are preferred. 4
- The AAP/AAFP guidelines recommend 80-90 mg/kg/day of amoxicillin for most children with AOM 4
- When selecting amoxicillin/clavulanate specifically, the dose should be 45 mg/kg/day (of amoxicillin component) divided twice daily, which provides adequate coverage while minimizing clavulanate-related gastrointestinal side effects 2, 3
- This dosing provides effective coverage against drug-resistant Streptococcus pneumoniae and beta-lactamase-producing Haemophilus influenzae 3, 5
Practical Prescribing Details
Use the Augmentin ES-600 formulation (600 mg amoxicillin/42.9 mg clavulanate per 5 mL) for pediatric dosing:
- Give approximately 3.4 mL twice daily (morning and evening) 2
- Administer at the start of meals to minimize gastrointestinal intolerance 1
- Continue treatment for 10 days 4, 1
- Shake suspension well before each use and refrigerate after reconstitution 1
Alternative if Plain Amoxicillin is Preferred
If prescribing plain amoxicillin instead of Augmentin, the dose would be 80-90 mg/kg/day divided twice daily (approximately 730-820 mg twice daily for this child) 4. However, since the question specifically asks about Augmentin, the amoxicillin/clavulanate formulation is appropriate, particularly if:
- The child received antibiotics in the previous 30 days 4, 6
- There is concurrent purulent conjunctivitis (otitis-conjunctivitis syndrome) 4
- The child attends daycare with high exposure to resistant organisms 7
Treatment Duration and Follow-Up
- Treat for minimum 10 days in children under 6 years with AOM 4, 1
- Reassess at 48-72 hours if symptoms worsen or fail to improve 4
- If treatment fails, consider switching to an alternative agent with broader coverage 4
Common Pitfall to Avoid
Do not use the adult 875 mg tablets or standard pediatric formulations with higher clavulanate ratios (e.g., 7:1 ratio), as these provide excessive clavulanate relative to amoxicillin and increase diarrhea risk without improving efficacy. 2, 3 The 14:1 ratio formulation (Augmentin ES-600) or twice-daily high-dose formulations minimize adverse effects while maintaining bacteriologic efficacy 2, 8.