First-Line Antibiotic Treatment for Acute Tonsillitis
Acute tonsillitis caused by Group A Beta-Hemolytic Streptococcus (GABHS/Strep A) requires targeted antibiotic therapy. Identifying the correct first-line agent — and knowing when to switch — is the core clinical decision this protocol addresses.
Treatment Approach
First-line management is built around a penicillin antibiotic, chosen because GABHS has retained consistent global sensitivity to this class. Structured alternatives are specified for patients who cannot tolerate the primary agent. The complete regimen — including the full decision sequence, alternative pathways, and treatment duration — is available in the protocol below.
Clinical Goals
- Pharyngeal culture becomes negative for GABHS within the first 24 hours
- Symptom reduction within 2 days in adolescents and young adults
References
DOI: 10.1016/j.otoeng.2015.05.003
- In the case of Strep A positivity, the use of phenoxymethyl penicillin or penicillin V is recommended (1 200 000 I.U./12 h orally), as GABHS has been and remains sensitive to this antibiotic globally.
- In the event of intolerance to the treatment of choice, amoxicillin 500 mg/12 h can be given.
- A first-generation cephalosporin can also be administered, such as cefadroxil 500 mg/12 h.
- Antibiotic treatment renders the culture negative in the first 24 h in 97% of cases, reducing the risk of contagion to other people.
- This difference is greater in adolescents and young adults, as antimicrobial treatment can reduce symptoms in these groups in 2 days.