Amoxicillin Alternatives for Pediatric GAS Pharyngitis with Non-Anaphylactic Penicillin Allergy

Introduction to Treatment Guidelines

The American Academy of Pediatrics and Infectious Diseases Society of America recommend first-generation cephalosporins, such as cephalexin (20 mg/kg per dose twice daily, maximum 500 mg/dose) or cefadroxil (30 mg/kg once daily, maximum 1 gram) for 10 days, as the preferred first-line alternatives for children with Group A Streptococcus pharyngitis and a non-anaphylactic penicillin allergy, with strong, high-quality evidence supporting their safety and efficacy 1, 2

For a child with a non-anaphylactic penicillin allergy, the risk of cross-reactivity with cephalosporins is approximately 0.1%, allowing for the safe use of these antibiotics 2, 3
In cases of immediate/anaphylactic penicillin allergy, the child should avoid all beta-lactam antibiotics, including cephalosporins, due to a 10% cross-reactivity risk, and instead use clindamycin (7 mg/kg per dose three times daily, maximum 300 mg/dose) for 10 days, which has a ~1% resistance rate 1, 2

The Infectious Diseases Society of America recommends azithromycin (12 mg/kg once daily, maximum 500 mg) for 5 days as an acceptable alternative for children with immediate/anaphylactic penicillin allergy, despite a 5-8% resistance rate in the US 1, 2
Clarithromycin (7.5 mg/kg per dose twice daily, maximum 250 mg/dose) for 10 days is also an option, but has similar resistance concerns as azithromycin 1, 2

The American Academy of Pediatrics and Infectious Diseases Society of America recommend a full 10-day course of antibiotics, except for azithromycin, which requires only 5 days, to achieve maximal pharyngeal eradication of Group A Streptococcus and prevent acute rheumatic fever 1, 2
Acetaminophen or NSAIDs, such as ibuprofen, should be considered for moderate to severe symptoms or high fever, while aspirin must be avoided in children due to Reye syndrome risk, and corticosteroids are not recommended as adjunctive therapy 1, 2