Amoxicillin Dosing for 14-Month-Old with Acute Otitis Media
For a 14-month-old child with acute otitis media using 400 mg/5 mL suspension, administer 80-90 mg/kg/day divided into 2 doses daily. 1
Calculating the Dose
To determine the exact volume to give:
- Weigh the child - this is essential for accurate dosing
- Calculate total daily dose: Child's weight (kg) × 80-90 mg = total mg per day
- Divide by 2 for twice-daily dosing
- Convert to mL: Since you have 400 mg/5 mL suspension (which equals 80 mg/mL):
- Dose in mg ÷ 80 = mL per dose
Example: For a 10 kg child:
- 10 kg × 90 mg/kg = 900 mg/day
- 900 mg ÷ 2 doses = 450 mg per dose
- 450 mg ÷ 80 mg/mL = 5.6 mL per dose, twice daily
Key Treatment Principles
High-dose amoxicillin (80-90 mg/kg/day) is the first-line treatment for acute otitis media in children. 1 This recommendation is based on:
- Effectiveness against common bacterial pathogens including drug-resistant Streptococcus pneumoniae
- Safety profile in children
- Low cost and acceptable taste
- Narrow microbiologic spectrum
Twice-daily dosing is appropriate and may improve adherence compared to three-times-daily regimens, with equivalent clinical efficacy. 2
When to Modify First-Line Treatment
Consider amoxicillin-clavulanate (90 mg/kg/day of amoxicillin component) instead if the child: 1
- Has taken amoxicillin in the previous 30 days
- Has concurrent purulent conjunctivitis (otitis-conjunctivitis syndrome)
- Requires coverage for beta-lactamase producing organisms
Duration of Therapy
Treat for 10 days in children under 2 years of age. 3 At 14 months, this child falls into the category requiring the full 10-day course rather than the shortened 5-day regimen used in older children.
Critical Pitfalls to Avoid
- Do not underdose: Research shows primary care physicians frequently prescribe lower-than-recommended doses in heavier children 4, but maintaining 80-90 mg/kg/day is essential for eradicating resistant pathogens 5, 6
- Do not use standard adult dosing: Even if the calculated pediatric dose exceeds typical adult doses, use the weight-based calculation 4
- Ensure accurate weight measurement: Dosing errors commonly occur from estimated rather than measured weights