Treatment for Strep Throat in Adults
First-Line Antibiotic Choice
- The American Academy of Family Physicians recommends amoxicillin 500 mg twice daily for 10 days as the first-line treatment for group A streptococcal pharyngitis in adults without penicillin allergy 1, 2, 3
- Amoxicillin or penicillin V are the drugs of choice based on their proven efficacy, safety, narrow spectrum of activity, and low cost 2, 3
- Penicillin-resistant group A streptococcus has never been documented, making these agents reliably effective 2, 3
Critical Treatment Duration
- The Infectious Diseases Society of America recommends that the full 10-day course of antibiotics is essential to maximize pharyngeal eradication of group A streptococcus and prevent acute rheumatic fever 2, 3, 5
- Symptoms typically resolve within 24-48 hours of starting antibiotics, but completing the full course prevents complications 2, 5
Alternative Options if Penicillin Allergy
- For patients with non-anaphylactic penicillin allergy, the American Academy of Family Physicians recommends first-generation cephalosporins, such as cephalexin 500 mg twice daily for 10 days 1, 6
- For patients with immediate/anaphylactic penicillin allergy, the Infectious Diseases Society of America recommends clindamycin 300 mg three times daily for 10 days, with only 1% resistance in the United States 1, 3, 6
Common Pitfalls to Avoid
- The Infectious Diseases Society of America advises against prescribing azithromycin or other macrolides as first-line therapy when penicillin/amoxicillin can be used, due to increasing macrolide resistance 3, 6
- The American Academy of Family Physicians recommends avoiding broad-spectrum cephalosporins (cefdinir, cefpodoxime) when narrow-spectrum options are effective 3, 5