Is giving 7.5 mL of amoxicillin‑clavulanate every 12 hours appropriate for a 19‑kg child?

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Last updated: October 25, 2026 • View editorial policy

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Dosing Assessment for 19-kg Child

No, 7.5 mL every 12 hours is insufficient for most indications requiring amoxicillin-clavulanate in a 19-kg child. This dose provides only approximately 47.5 mg/kg/day of amoxicillin, which falls well below guideline-recommended dosing for common pediatric infections.

Correct Dosing Based on Indication

For Otitis Media, Sinusitis, or Lower Respiratory Tract Infections

The appropriate dose is 90 mg/kg/day of the amoxicillin component, divided every 12 hours 1, 2, 3. For a 19-kg child:

  • Total daily amoxicillin needed: 1,710 mg/day
  • Per dose: 855 mg every 12 hours

Using the 400 mg/57 mg per 5 mL suspension (high-dose formulation):

  • Give 10.5 mL every 12 hours (provides 840 mg amoxicillin per dose)

Alternatively, using the 200 mg/28.5 mg per 5 mL suspension:

  • Give 21 mL every 12 hours (provides 840 mg amoxicillin per dose)

For Less Severe Infections

If treating a mild infection where lower dosing is acceptable (25 mg/kg/day) 1:

  • Total daily amoxicillin: 475 mg/day
  • Per dose: 237.5 mg every 12 hours

Using the 200 mg/28.5 mg per 5 mL suspension:

  • Give 6 mL every 12 hours (provides 240 mg amoxicillin per dose)

Why Your Current Dose is Problematic

Your 7.5 mL dose depends entirely on which formulation you're using:

  • If using 125 mg/31.25 mg per 5 mL: provides only 187.5 mg amoxicillin per dose (19.7 mg/kg/day total) - grossly inadequate
  • If using 200 mg/28.5 mg per 5 mL: provides 300 mg amoxicillin per dose (31.6 mg/kg/day total) - still below recommended dosing
  • If using 400 mg/57 mg per 5 mL: provides 600 mg amoxicillin per dose (63.2 mg/kg/day total) - closer but still subtherapeutic for most indications

Critical Considerations

The every-12-hour regimen is strongly preferred over every-8-hour dosing because it significantly reduces diarrhea while maintaining equivalent efficacy 3. This has been demonstrated in clinical studies and is explicitly recommended in FDA labeling.

For β-lactamase-producing organisms (H. influenzae, M. catarrhalis), the high-dose formulation with the 14:1 ratio (90 mg/kg amoxicillin with 6.4 mg/kg clavulanate) is essential 1, 2, 4. This formulation minimizes clavulanate-related diarrhea while providing adequate β-lactamase inhibition.

Common prescribing error: Clinicians often underdose larger children due to concerns about exceeding "adult maximum doses" 5. However, weight-based dosing should be maintained up to 40 kg, after which adult dosing applies 3.

Verification Steps

  1. Confirm the suspension concentration you're using
  2. Identify the specific infection being treated
  3. Calculate the exact mg/kg/day the child is receiving
  4. Adjust to guideline-recommended dosing based on infection severity

For a 19-kg child with otitis media, sinusitis, or pneumonia requiring amoxicillin-clavulanate, you should be prescribing 10.5 mL of the 400/57 mg per 5 mL suspension every 12 hours for 10 days 1, 4, 3.

References

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This information is intended for healthcare professionals. Any medical decision-making should rely on clinical judgment and independently verified information. The content provided herein does not replace professional discretion and should be considered supplementary to established clinical guidelines. Healthcare providers should verify all information against primary literature and current practice standards before application in patient care. Dr.Oracle assumes no liability for clinical decisions based on this content.