High‑Dose Amoxicillin for Acute Otitis Media in Children

First‑Line Dosing Recommendations

The American Academy of Pediatrics recommends high‑dose amoxicillin 80–90 mg/kg/day divided twice daily as the initial therapy for acute otitis media in children ≥ 3 months of age. [1][2]
For infections caused by Streptococcus pyogenes the minimum treatment duration is 10 days to prevent rheumatic fever; for uncomplicated AOM a 5–10 day course is appropriate. 2

A three‑times‑daily regimen of 40 mg/kg/day (divided every 8 h) is an acceptable alternative, but twice‑daily dosing improves adherence and is therefore preferred. 1

Switch to high‑dose amoxicillin‑clavulanate (amoxicillin 90 mg/kg/day + clavulanate 6.4 mg/kg/day; 14:1 ratio) if any of the following apply:

High‑dose amoxicillin maintains serum concentrations above the minimum inhibitory concentration of resistant Streptococcus pneumoniae for a longer portion of the dosing interval, enhancing bacterial eradication. 2
Despite β‑lactamase production, 58–82 % of H. influenzae isolates remain susceptible to high‑dose amoxicillin, supporting its use against this pathogen. [1][2]
In trials, high‑dose amoxicillin‑clavulanate achieved 96 % eradication of S. pneumoniae from middle‑ear fluid by days 4–6 of therapy. 2
The guideline panel emphasizes high‑dose therapy because resistance patterns are unpredictable and the regimen has a favorable safety profile; overall treatment‑failure rates are low (≈5 %). [1][2]

Formulations of amoxicillin‑clavulanate that deviate from the 14:1 amoxicillin‑to‑clavulanate ratio are associated with a higher incidence of diarrhea and should be avoided. 2

For children with acute otitis media who need β‑lactamase coverage, the American Academy of Pediatrics and American Academy of Family Physicians recommend high‑dose amoxicillin‑clavulanate delivering 90 mg/kg/day of amoxicillin plus 6.4 mg/kg/day of clavulanate, divided twice daily. 5 (Grade B‑C)
For adults with acute otitis media, the same guidelines recommend the standard formulation 875 mg/125 mg taken twice daily. 5 (Grade B‑C)

Use high‑dose amoxicillin‑clavulanate when the child has had amoxicillin exposure within the previous 30 days. 5 (Grade B‑C)
Use it when there is concurrent purulent conjunctivitis (otitis‑conjunctivitis syndrome). 5 (Grade B‑C)
Use it after clinical failure of initial amoxicillin therapy observed at 48–72 hours. 5 (Grade B‑C)
Use it for children with a history of recurrent acute otitis media that has not responded to amoxicillin alone. 5 (Grade B‑C)

Clinicians should reassess patients at 48–72 hours after therapy start; worsening or lack of improvement warrants a regimen change. 5 (Grade B‑C)
If the initial regimen was amoxicillin alone, switch to high‑dose amoxicillin‑clavulanate at reassessment. 5 (Grade B‑C)
If the patient is already on high‑dose amoxicillin‑clavulanate and fails to improve, consider alternative agents such as ceftriaxone. 5 (Grade B‑C)

The dosing recommendations, indication criteria, and reassessment algorithm are supported by Grade B‑C evidence in the 2013 AAP/AAFP clinical practice guidelines. 5