What is the appropriate dosing regimen of Augmentin (amoxicillin/clavulanic acid) 250 mg/5 mg for a 22‑kg child?

Augmentin Dosing for a 22kg Child

For a 22kg child, the appropriate dose of Augmentin depends on the indication and severity of infection, but typically ranges from 990mg to 1980mg of amoxicillin component per day, divided into 2-3 doses.

Standard Dosing Regimens

For Mild-to-Moderate Infections

• Standard dose: 45 mg/kg/day of amoxicillin component divided into 2 doses (BID)
  • For 22kg child: 495mg BID (approximately 10mL of 250mg/5mL suspension twice daily)
  • Alternative: 45 mg/kg/day divided into 3 doses (TID) = 330mg TID (approximately 6.5mL three times daily)

For Severe Infections or Resistant Pathogens

• High dose: 90 mg/kg/day divided into 2 doses (BID)
  • For 22kg child: 990mg BID (approximately 20mL of 250mg/5mL suspension twice daily)
  • This is particularly important for:
    • Recent antibiotic use within 30 days 1
    • Daycare attendance 1, 2
    • Age <2 years (though this child is likely older given weight)
    • Areas with high penicillin-resistant S. pneumoniae (>10%) 2
    • Treatment failure on standard-dose amoxicillin 1

Clinical Decision Algorithm

Choose HIGH-DOSE (90 mg/kg/day) if ANY of the following:

• Child attends daycare
• Received antibiotics in past 30 days
• Concurrent conjunctivitis
• Moderate-to-severe illness presentation
• Failed previous amoxicillin therapy
• Known local resistance patterns show >10% penicillin-nonsusceptible S. pneumoniae

Choose STANDARD-DOSE (45 mg/kg/day) if:

• Mild infection
• No recent antibiotic exposure
• No daycare attendance
• Age ≥2 years
• Low local resistance rates

Formulation Considerations

The "250/5" designation typically refers to 250mg amoxicillin per 5mL suspension. However, critical caveats exist:

• Standard Augmentin formulations contain varying ratios of clavulanate:

  • 250mg/5mL suspension contains 62.5mg clavulanate per 5mL (4:1 ratio)
  • Different formulations have different clavulanate content 3

• Augmentin ES-600 (if available) provides 600mg amoxicillin/42.9mg clavulanate per 5mL and is specifically designed for high-dose therapy 3

  • For 22kg child: 7.5mL BID of ES-600 formulation
  • This formulation is NOT interchangeable with standard suspensions 3

Duration of Therapy

• Acute otitis media: 10 days 1, 3
• Acute bacterial sinusitis: 10-14 days 2
• Community-acquired pneumonia: 7-10 days (may extend to 14 days based on clinical response) 4, 5

Administration Guidance

• Give at the start of meals to minimize gastrointestinal intolerance and enhance clavulanate absorption 3
• Shake suspension well before each dose 3
• Refrigerate reconstituted suspension; stable for 10 days 3

Common Pitfalls to Avoid

1. Don't underdose resistant infections: Using standard-dose amoxicillin-clavulanate when high-dose is indicated leads to treatment failure, particularly with penicillin-resistant S. pneumoniae (MIC ≥2 mcg/mL) 1, 3

2. Don't confuse formulations: ES-600 and standard suspensions have different clavulanate concentrations and are NOT interchangeable 3

3. Don't ignore BID vs TID dosing: BID dosing (with appropriate total daily dose) reduces diarrhea incidence from 26.7% to 9.6% compared to TID dosing 6

4. Don't use when amoxicillin alone suffices: For uncomplicated infections without β-lactamase-producing organisms, amoxicillin alone is preferred to reduce side effects and resistance pressure 7

Evidence Quality Note

The dosing recommendations are based on FDA-approved labeling 3 and high-quality pediatric infectious disease guidelines from IDSA/PIDS (2011) 4, 8 and AAP (2013) 1, 2. The high-dose regimen (90 mg/kg/day) demonstrated 98.4% bacteriologic eradication of S. pneumoniae and 89.1% clinical cure rates in rigorous clinical trials 3.