What is the exact dose (volume) of amoxicillin suspension 125 mg/5 mL for a [WEIGHT]‑lb boy with a mild puncture‑wound infection?

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Last updated: October 25, 2026 • View editorial policy

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Amoxicillin Dosing for Mild Puncture Wound Infection

I cannot provide an exact dose calculation without knowing the child's weight, as you've indicated [WEIGHT] as a placeholder.

Dosing Algorithm for Skin and Soft Tissue Infections

For a mild puncture wound infection in a pediatric patient, use amoxicillin 45-50 mg/kg/day divided into 2-3 doses 1. This is the standard dosing for mild skin and soft tissue infections when Staphylococcus aureus or Streptococcus species are suspected.

Step-by-Step Calculation:

  1. Determine the child's weight in kg (divide pounds by 2.2)
  2. Calculate total daily dose: Weight (kg) × 45-50 mg = Total mg/day
  3. Divide by 2 or 3 for twice or three times daily dosing
  4. Convert to volume: Each 5 mL of the 125 mg/5 mL suspension contains 125 mg 1
    • Formula: (Dose in mg ÷ 125 mg) × 5 mL = Volume per dose

Example Calculations:

  • 20 lb child (9.1 kg):

    • 9.1 kg × 45 mg = 410 mg/day
    • Divided TID = 137 mg per dose
    • Volume = (137 ÷ 125) × 5 = 5.5 mL three times daily

  • 40 lb child (18.2 kg):

    • 18.2 kg × 45 mg = 819 mg/day
    • Divided TID = 273 mg per dose
    • Volume = (273 ÷ 125) × 5 = 10.9 mL three times daily

  • 60 lb child (27.3 kg):

    • 27.3 kg × 45 mg = 1,228 mg/day
    • Divided TID = 409 mg per dose
    • Volume = (409 ÷ 125) × 5 = 16.4 mL three times daily

Important Considerations for Puncture Wounds

Puncture wounds require special consideration for Pseudomonas aeruginosa (especially plantar punctures through shoes) and Pasteurella multocida (animal bites) 2. Standard amoxicillin alone may be insufficient for these pathogens.

When to Use Alternative Therapy:

  • Plantar puncture wounds: Consider ciprofloxacin for Pseudomonas coverage 2
  • Animal bites: Use amoxicillin-clavulanate for Pasteurella coverage 2
  • Signs of deeper infection: Consider broader coverage or parenteral therapy 3

Common Pitfalls

  1. Underdosing larger children: Studies show children >60 kg often receive <40 mg/kg/day, which is inadequate 4
  2. Stopping at "adult maximum": The 500 mg TID adult dose may be insufficient for larger children when calculated per kg 4
  3. Using 125 mg/5 mL for all ages: Larger children may require the 250 mg/5 mL concentration to avoid excessive volumes

Please provide the child's actual weight for a specific volume calculation.

References

2
Research

Targeting lurking pathogens in acute traumatic and chronic wounds.

The Journal of emergency medicine, 1999

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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.