Maximum Amoxicillin Dose for a 14.97 kg Child
For a child weighing 14.97 kg, the maximum amoxicillin dose is 1,347 mg per day (90 mg/kg/day), typically divided into two doses of 673.5 mg every 12 hours.
Dosing Framework
The maximum dose depends on the clinical indication and severity of infection:
High-Dose Amoxicillin (80-90 mg/kg/day)
This is the preferred maximum dosing for:
- Community-acquired pneumonia caused by Streptococcus pneumoniae 1, 2
- Acute otitis media in children with recent antibiotic exposure, concurrent conjunctivitis, or when coverage for resistant organisms is needed 3
- Acute bacterial sinusitis in children <2 years, those attending daycare, or with recent antibiotic use 4
For this 14.97 kg child:
- 90 mg/kg/day = 1,347 mg/day divided every 12 hours = 673.5 mg per dose
- 80 mg/kg/day = 1,198 mg/day divided every 12 hours = 599 mg per dose
Standard-Dose Amoxicillin (45 mg/kg/day)
Used for less severe infections:
- Mild-to-moderate ear/nose/throat infections
- Skin/skin structure infections
- Genitourinary tract infections 5
For this 14.97 kg child:
- 45 mg/kg/day = 673.5 mg/day divided every 12 hours = 336.75 mg per dose
Critical Considerations
FDA-Approved Maximum Dosing
The FDA label specifies that for severe infections or lower respiratory tract infections, pediatric patients <40 kg should receive 45 mg/kg/day divided every 12 hours or 40 mg/kg/day divided every 8 hours 5. However, clinical practice guidelines from IDSA/PIDS recommend higher doses (80-90 mg/kg/day) for pneumococcal infections to overcome resistance 1, 2.
Adult Dose Ceiling Pitfall
Common error: Many clinicians inappropriately cap pediatric doses at the "adult maximum" of 1,500 mg/day. Research demonstrates that children >15-20 kg frequently receive subtherapeutic doses when providers apply adult maximums 6, 7. This 14.97 kg child should NOT be limited to adult dosing—the weight-based calculation takes precedence.
Practical Dosing
Given available formulations:
- High-dose regimen: Round to 675 mg every 12 hours (1,350 mg/day total)
- This can be achieved with suspension (250 mg/5 mL = 13.5 mL per dose) or tablets if the child can swallow them
When to Use Maximum Dosing
Use 80-90 mg/kg/day when:
- Treating pneumococcal pneumonia (regardless of penicillin susceptibility) 1, 2
- Local pneumococcal resistance rates >10% 4
- Recent antibiotic exposure within 30 days 3, 4
- Severe infection requiring hospitalization 1
- Child attends daycare 4
Use standard 45 mg/kg/day when:
- Mild-to-moderate infections in low-risk patients
- No recent antibiotic exposure
- Low local resistance rates
Duration
Continue treatment for minimum 48-72 hours beyond symptom resolution or bacterial eradication 5. For Streptococcus pyogenes infections, treat for at least 10 days to prevent acute rheumatic fever 5.