Treatment for Strep Pharyngitis in Patients with Penicillin Anaphylaxis

First-Line Treatment Options

• The Infectious Diseases Society of America recommends clindamycin as the preferred treatment for patients with anaphylactic sensitivity to penicillin, administered at 7 mg/kg/dose three times daily (maximum 300 mg/dose) for 10 days 1, 2, 3
• Clindamycin has demonstrated high efficacy in eradicating streptococci, even in chronic carriers 3
• Resistance to clindamycin among Group A Streptococcus isolates in the United States is low, approximately 1% 3

Alternative Treatment Options

• Clarithromycin is an alternative option, administered at 7.5 mg/kg/dose twice daily (maximum 250 mg/dose) for 10 days 1, 2, 4
• Azithromycin can be used at 12 mg/kg once daily (maximum 500 mg) for 5 days 1, 2, 4
• Macrolides (azithromycin and clarithromycin) should be used with caution due to variable resistance rates that differ geographically 2, 3, 4

Important Considerations

• First-generation cephalosporins (cephalexin, cefadroxil) should be avoided in patients with anaphylactic reactions to penicillin due to potential cross-reactivity (up to 10%) 1, 3
• The full 10-day course of antibiotics (except for 5 days with azithromycin) is important to achieve maximal pharyngeal eradication of Group A Streptococcus 1, 5

Adjunctive Therapy

• Acetaminophen or NSAIDs can be used for symptomatic relief of moderate to severe symptoms or high fever 2, 3, 5
• Aspirin should be avoided in children due to the risk of Reye syndrome 3, 4
• Corticosteroids are not recommended as adjunctive therapy 3, 4

Follow-Up Recommendations

• Routine post-treatment throat cultures are not recommended for asymptomatic patients who have completed therapy 1, 3

Common Pitfalls to Avoid

• Using first-generation cephalosporins in patients with anaphylactic reactions to penicillin due to potential cross-reactivity 1, 3
• Prescribing macrolides in areas with high resistance rates without considering local patterns 2, 3
• Treating viral pharyngitis with antibiotics (most cases of sore throat are viral) 5
• Unnecessary tonsillectomy solely to reduce frequency of GAS pharyngitis 4