What is the appropriate Augmentin (amoxicillin‑clavulanate) dose for a pediatric patient weighing 22.23 kg?

Augmentin Dosing for 22.23 kg Pediatric Patient

For a pediatric patient weighing 22.23 kg, the appropriate Augmentin dose is 2000 mg/day of amoxicillin (90 mg/kg/day) divided into two doses of 1000 mg each, given every 12 hours. This translates to approximately 10 mL twice daily of the 400 mg/5 mL suspension or one 1000 mg tablet twice daily if the child can swallow tablets 1.

Dosing Algorithm by Clinical Context

For Most Common Infections (Otitis Media, Sinusitis, Pneumonia)

Standard high-dose regimen:

• 90 mg/kg/day of amoxicillin component divided into 2 doses
• For 22.23 kg: 2000 mg/day total = 1000 mg twice daily
• Maximum single dose: 2000 mg 2, 3, 2

Practical formulation options:

• Augmentin 400 mg/5 mL suspension: 12.5 mL twice daily (provides 1000 mg amoxicillin per dose)
• Augmentin tablets 500/125 mg: Two tablets twice daily
• Augmentin XR 1000/62.5 mg: One tablet twice daily (if age-appropriate and can swallow)

For β-Lactamase Producing Organisms (H. influenzae, M. catarrhalis)

When β-lactamase-producing pathogens are suspected (recent antibiotic use, daycare attendance, age <2 years, or treatment failure):

High-dose amoxicillin-clavulanate:

• 90 mg/kg/day amoxicillin with 6.4 mg/kg/day clavulanate in 2 divided doses
• For 22.23 kg: 2000 mg amoxicillin + 142 mg clavulanate daily
• Use 14:1 ratio formulation to minimize diarrhea 2, 3, 4

Age-Specific Considerations

If child is <5 years old:

• Preferred: Amoxicillin-clavulanate 90 mg/kg/day in 2 doses 2
• For 22.23 kg: 1000 mg twice daily

If child is ≥5 years old:

• Same dosing: 90 mg/kg/day up to maximum 4 g/day 2
• For 22.23 kg: 1000 mg twice daily (well below maximum)

Critical Dosing Pitfalls to Avoid

1. Do NOT substitute different Augmentin formulations interchangeably - ES-600 contains different clavulanate ratios (42.9 mg/5 mL) compared to standard suspensions (28.5 or 57 mg/5 mL) 1

2. Do NOT use standard-dose amoxicillin-clavulanate (45 mg/kg/day) for empiric therapy in areas with penicillin-resistant S. pneumoniae or when β-lactamase producers are likely 2, 3

3. Administer at the start of meals to minimize GI intolerance and enhance clavulanate absorption 1

4. Shake suspension well before each dose - critical for accurate dosing 1

Evidence Strength and Nuances

The 90 mg/kg/day dosing is strongly supported by IDSA/PIDS guidelines for community-acquired pneumonia 2, 3, 2 and AAP guidelines for acute otitis media 4. This high-dose regimen achieves middle ear fluid concentrations sufficient to overcome intermediate and some highly resistant S. pneumoniae strains (MIC ≤2 μg/mL) 4, 1.

Important consideration: Recent evidence suggests the clavulanate component may be reduced to 2.85-3.2 mg/kg/day without loss of efficacy while decreasing diarrhea rates from 26% to 17% 5. However, this is not yet reflected in FDA labeling or standard formulations.

Treatment duration: 10 days for most infections, though 5-7 days may suffice for uncomplicated cases in children >2 years 6, 4.

Monitoring and Follow-up

• Expect clinical improvement within 48-72 hours 2, 3
• If no improvement or deterioration occurs, consider treatment failure and need for alternative therapy
• Watch for diarrhea (occurs in 17-26% of patients) and diaper dermatitis (21-33%) 5, 7