Amoxicillin‑Clavulanate Dosing Guidelines for Children
High‑Dose Regimen (Preferred for Most Infections)
- Dose: 90 mg/kg/day amoxicillin + 6.4 mg/kg/day clavulanate, divided every 12 h (maximum 4 g/day amoxicillin). This provides optimal coverage against penicillin‑resistant Streptococcus pneumoniae and β‑lactamase‑producing Haemophilus influenzae【1】.
- Amoxicillin : clavulanate ratio: 14 : 1, which reduces the incidence of diarrhea compared with other formulations while preserving efficacy【1】.
- Maximum single dose: 2000 mg amoxicillin per administration, irrespective of weight【1】.
- Typical treatment duration: 10 days for most respiratory infections【1】.
Standard‑Dose Regimen (Limited Use)
- Dose: 45 mg/kg/day amoxicillin + 6.4 mg/kg/day clavulanate, divided every 12 h. Recommended only for uncomplicated infections in children without identified risk factors【1】.
Age‑Based Suspension Dosing (For Mild Infections Only)
| Age | Suspension & Volume (TID) |
|---|---|
| < 1 yr (1‑12 mo) | 2.5 mL of 125/31 mg mL⁻¹ |
| 1‑6 yr | 5 mL of 125/31 mg mL⁻¹ |
| 7‑12 yr | 5 mL of 250/62 mg mL⁻¹ |
| 12‑18 yr | 1 tablet (250/125 mg) |
These age‑based doses deliver substantially lower amoxicillin exposure than the high‑dose regimen and should be reserved for mild infections without risk factors【3】.
Indications for High‑Dose Therapy (Presence of Any Risk Factor)
- Age < 2 years【1】【2】
- Attendance at a daycare facility【1】【2】
- Antibiotic use within the preceding 30 days【1】【2】
- Incomplete Hib vaccination (< 3 doses)【1】
- Residence in an area where > 10 % of S. pneumoniae are penicillin‑resistant【1】【2】
- Moderate to severe illness at presentation【1】
- Concurrent purulent acute otitis media【1】
- Prior treatment failure with amoxicillin alone【1】
Infection‑Specific Dosing
Acute Otitis Media
- Regimen: 90 mg/kg/day amoxicillin + clavulanate in two divided doses for 10 days【1】.
- Efficacy: Predicted clinical efficacy of 90‑92 % against penicillin‑resistant S. pneumoniae【1】.
- Special note: Children < 2 years should receive the high‑dose formulation【1】.
Community‑Acquired Pneumonia (Outpatient)
- Children < 5 years: 90 mg/kg/day amoxicillin + clavulanate in two divided doses【1】.
- If Hib vaccination incomplete or concurrent purulent otitis media: 80‑90 mg/kg/day amoxicillin + clavulanate【1】.
- Duration: 10 days【1】.
- For children < 3 years without risk factors: Consider amoxicillin alone 80‑100 mg/kg/day in three divided doses as first line【1】.
Acute Bacterial Rhinosinusitis
- Regimen: 90 mg/kg/day amoxicillin + clavulanate in two divided doses for 10‑14 days. Strongly recommended as first‑line therapy【1】.
Skin and Soft‑Tissue Infections
- Children < 1 year: 0.266 mL/kg of 125/31 mg mL⁻¹ suspension three times daily (≈ 3 mL for an 11 kg child)【4】.
- Duration: 7‑10 days, extendable to 14 days based on clinical response【4】.
- Severe infections: Dose may be doubled【4】.
Intravenous Dosing for Severe Infections
- Dose: 30 mg/kg every 8 hours (TID) IV for all pediatric ages【3】.
- Transition: Switch to oral formulation as soon as clinically appropriate【2】.
Renal Impairment Adjustments
- Prolong the dosing interval according to creatinine clearance to avoid drug accumulation【1】.
- Both amoxicillin and clavulanate are renally eliminated; significant dose reduction is required in children with reduced renal function【1】.
Alternatives for Penicillin Allergy
| Allergy Type | Recommended Alternative(s) | Typical Dosing |
|---|---|---|
| Non‑type I (non‑anaphylactic) | Clindamycin + third‑generation oral cephalosporin | – |
| Type I (anaphylaxis) | Clarithromycin | < 1 yr: 7.5 mg/kg BID; 1‑2 yr: 62.5 mg BID; 3‑6 yr: 125 mg BID; 7‑9 yr: 187.5 mg BID; ≥ 10 yr: 250 mg BID【3】 |
Monitoring and Reassessment
- Expected clinical improvement: Within 48‑72 hours of therapy initiation【1】【2】.
- If no improvement or worsening after 72 hours: Re‑evaluate diagnosis, consider atypical pathogens, assess for complications, or change antibiotics【1】【2】.
- Continuation after symptom resolution: Treat for an additional 7 days once the child is free of signs and symptoms【1】.
Adverse Effects
- Diarrhea occurs in ~25 % of treated children vs 15 % with placebo; nausea, vomiting, and diaper dermatitis occur in ~51 % vs 35 % with placebo【1】.
- The 14 : 1 amoxicillin‑to‑clavulanate formulation reduces diarrhea incidence compared with other amoxicillin‑clavulanate preparations【1】.
Treatment Duration
- Standard course for most pediatric infections is 10 days【1】.
- Incomplete courses increase the risk of treatment failure and antimicrobial resistance【4】.
Common Pitfalls
- Underdosing: Using age‑based dosing when high‑dose therapy is indicated leads to treatment failure against resistant organisms【1】.
- Subtherapeutic exposure: Fails to achieve adequate serum/tissue levels and promotes resistance【1】.
- Suspension verification: Always confirm the concentration (125/31 mg mL⁻¹ vs 250/62 mg mL⁻¹) before calculating volume to avoid dosing errors【1】.
Abscess Management
- Primary treatment for fluctuant boils or abscesses is incision and drainage; antibiotics alone are insufficient【4】.