Augmented Dosing for Pediatric Streptococcal Pharyngitis

First-Line Treatment: Standard Amoxicillin

The Infectious Diseases Society of America (IDSA) establishes amoxicillin as the preferred oral antibiotic for pediatric strep throat, with strong evidence supporting its superiority over penicillin V 1
Amoxicillin 50 mg/kg once daily (maximum 1000 mg) for 10 days is a recommended dosing regimen 1
Alternative: 25 mg/kg twice daily (maximum 500 mg per dose) for 10 days is also recommended 1
Both regimens demonstrate equivalent efficacy with strong, high-quality evidence 1

The American Academy of Family Physicians specifically reserves amoxicillin/clavulanate for treatment failures after initial therapy with standard antibiotics 2
Amoxicillin/clavulanate is also reserved for chronic Group A Streptococcus carriers who have failed first-line eradication attempts 2
40 mg/kg/day of amoxicillin component divided into three doses (maximum 2000 mg/day) for 10 days is the recommended dosing regimen for these scenarios 2

For children with documented penicillin allergy, cephalexin 20 mg/kg/dose twice daily (maximum 500 mg/dose) for 10 days is a recommended alternative 1
Cefadroxil 30 mg/kg once daily (maximum 1 g) for 10 days is also a recommended alternative 1
Clindamycin 7 mg/kg/dose three times daily (maximum 300 mg/dose) for 10 days is a recommended alternative for type I hypersensitivity reactions 1
Azithromycin 12 mg/kg once daily (maximum 500 mg) for 5 days is a recommended alternative, but use with caution due to resistance 1
Clarithromycin 7.5 mg/kg/dose twice daily (maximum 250 mg/dose) for 10 days is a recommended alternative, but use with caution due to resistance 1

All oral regimens must be completed for 10 full days to prevent acute rheumatic fever, regardless of symptom resolution, as recommended by the Infectious Diseases Society of America (IDSA) 1
Benzathine penicillin G is an alternative for situations where compliance cannot be assured, with dosing regimens of 600,000 units intramuscularly as a single dose for children <27 kg, and 1,200,000 units intramuscularly as a single dose for children ≥27 kg, as recommended by the Infectious Diseases Society of America (IDSA) 1
Assess for antibiotic use in previous 4-6 weeks, as recent exposure increases risk of resistant organisms, according to the American Academy of Family Physicians 4
Evaluate clinical response at 48-72 hours, and consider local resistance patterns when selecting therapy, particularly for macrolides, as recommended by the Infectious Diseases Society of America (IDSA) and the American Academy of Family Physicians 1, 2