What is the appropriate dose of Augmentin (amoxicillin 250 mg/5 mL + clavulanic acid 62.5 mg/5 mL) for a 4‑year‑old child weighing 16.78 kg with otitis media?

Dosing Recommendation for Augmentin in Otitis Media

For this 4-year-old child weighing 16.78 kg with otitis media, prescribe Augmentin 90 mg/kg/day of the amoxicillin component divided into two daily doses, which equals approximately 755 mg amoxicillin per day or 7.5 mL of the 250 mg/5 mL suspension twice daily (total 15 mL/day). 1, 2

Rationale for High-Dose Amoxicillin-Clavulanate

The formulation you have (250 mg amoxicillin + 62.5 mg clavulanate per 5 mL) provides a 4:1 ratio, which is not the preferred formulation for treating otitis media in this age group. Current guidelines strongly recommend high-dose amoxicillin-clavulanate at 90 mg/kg/day of amoxicillin with 6.4 mg/kg/day of clavulanate (14:1 ratio) to adequately cover penicillin-resistant Streptococcus pneumoniae and β-lactamase-producing Haemophilus influenzae. 1, 2

Specific Dosing Calculation

For a 16.78 kg child:

• Target dose: 90 mg/kg/day amoxicillin = 1,510 mg/day
• Divided into 2 doses: 755 mg per dose
• Using your 250 mg/5 mL suspension: 15 mL per dose (twice daily)

However, this provides only 187.5 mg clavulanate per day (11.2 mg/kg/day), which exceeds the recommended 6.4 mg/kg/day and increases diarrhea risk. 3

Critical Formulation Issue

The ideal formulation is Augmentin ES-600 (600 mg amoxicillin + 42.9 mg clavulanate per 5 mL), which provides the 14:1 ratio. 2 For this 16.78 kg child, the ES-600 dose would be:

• 90 mg/kg/day = 1,510 mg amoxicillin/day
• Volume needed: 12.6 mL twice daily of ES-600 suspension

If Using Your Current Formulation (250/62.5 per 5 mL)

If ES-600 is unavailable and you must use the 250/62.5 formulation:

• Dose: 7.5 mL twice daily (provides 750 mg amoxicillin/day = 45 mg/kg/day)
• Duration: 10 days 1, 2
• Limitation: This provides suboptimal coverage for resistant pneumococci

Treatment Duration and Monitoring

• Standard duration: 10 days for children under 6 years 1, 2
• Assess response: Clinical improvement expected within 48-72 hours 4
• Treatment failure criteria: Lack of improvement or worsening after 48-72 hours warrants consideration of ceftriaxone (50 mg/kg IM for 3 days) 1

Important Clinical Considerations

Risk factors requiring high-dose therapy include:

• Age under 2 years (this child is 4, so moderate risk)
• Recent antibiotic use within 30 days
• Daycare attendance
• Recurrent otitis media 1, 2

Common adverse effects with the higher clavulanate ratio in your formulation:

• Diarrhea occurs in 26-33% of children 5, 3
• Diaper dermatitis in 21-33% 3
• These rates are higher than with the 14:1 ratio formulation

Practical Administration

• Give at the start of meals to minimize gastrointestinal intolerance and enhance clavulanate absorption 2
• Shake suspension well before each dose
• Refrigerate after reconstitution; stable for 10 days 2
• Monitor compliance using bottle volume measurement

Alternative if Treatment Fails

If clinical failure occurs after 48-72 hours on your current formulation:

• Switch to: Ceftriaxone 50 mg/kg IM daily for 3 days, OR
• Switch to: High-dose amoxicillin-clavulanate ES-600 if available 1

Bottom line: While you can use the 250/62.5 formulation at 7.5 mL twice daily, strongly consider obtaining the ES-600 formulation (14:1 ratio) for optimal efficacy against resistant pathogens and reduced side effects. The current evidence demonstrates superior clinical cure rates (86.5% vs 71%) with properly dosed high-dose amoxicillin-clavulanate compared to alternatives. 5