Amoxicillin-Clavulanic Acid (Amoxyclav) Syrup Dosing for Children
For β-lactamase-producing Haemophilus influenzae infections (including pneumonia), the recommended dose is 45 mg/kg/day of the amoxicillin component in 3 divided doses OR 90 mg/kg/day in 2 divided doses 1, 2, 1, 2.
Standard Dosing Regimens
For Most Common Infections
- Standard dose: 45 mg/kg/day (amoxicillin component) divided into 3 doses
- High dose: 90 mg/kg/day (amoxicillin component) divided into 2 doses with maximum 6.4 mg/kg/day of clavulanate 1, 2
The high-dose regimen (90/6.4 mg/kg/day in 2 divided doses) is specifically designed to maintain adequate clavulanate levels while maximizing amoxicillin exposure, and has demonstrated excellent tolerability comparable to conventional dosing 3.
Specific Clinical Scenarios
For acute bacterial sinusitis in children with risk factors (age <2 years, recent antibiotic use within 30 days, or daycare attendance):
- Use high-dose amoxicillin-clavulanate: 80-90 mg/kg/day of amoxicillin component with 6.4 mg/kg/day clavulanate in 2 divided doses, maximum 2 g per dose 4
For β-lactamase-producing H. influenzae pneumonia:
Administration Guidelines
Practical Considerations
- Twice-daily dosing (90 mg/kg/day in 2 doses) is associated with less diarrhea than three-times-daily regimens 3
- The 4:1 ratio (amoxicillin:clavulanate) was established based on clavulanic acid's high affinity for β-lactamases 5
- Peak serum concentrations occur approximately 1.2-1.4 hours after oral administration 6, 7
Duration of Therapy
- Acute otitis media: 5-7 days or 48 hours after symptom resolution 8
- Pneumonia: 5-7 days minimum 1, 2
- Acute bacterial sinusitis: 10-14 days (7 days after becoming symptom-free) 4
Important Clinical Caveats
When to Use Amoxicillin Alone Instead
Amoxicillin-clavulanate should be reserved for situations where β-lactamase-producing organisms are suspected. For non-β-lactamase-producing H. influenzae, use amoxicillin alone at 75-100 mg/kg/day in 3 doses 1, 2, 1, 2. This avoids unnecessary clavulanate exposure and reduces gastrointestinal side effects, particularly Clostridium difficile infection risk 5.
Tolerability Profile
The most common adverse effects are mild gastrointestinal disturbances, with diarrhea being significantly less frequent with twice-daily versus three-times-daily dosing 3. The high-dose formulation (90/6.4 mg/kg/day) shows similar tolerability to conventional twice-daily formulations 3.
Storage Requirements
Reconstituted suspension must be refrigerated and discarded after 10 days 9. This is critical for maintaining drug stability, particularly for clavulanic acid, which is less heat-stable than amoxicillin 5.
Resistance Considerations
In communities with high prevalence of β-lactamase-producing H. influenzae (>10%), or when treating children with recent antibiotic exposure, amoxicillin-clavulanate is preferred over amoxicillin alone 4. Local susceptibility patterns should guide empiric therapy decisions whenever possible.