What is the recommended Augmentin (amoxicillin/clavulanate) dosing for community‑acquired pneumonia in adults, including oral and intravenous regimens and renal impairment adjustments, and the appropriate pediatric dosing?

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Last updated: March 31, 2026 • View editorial policy

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Augmentin Dosing for Community-Acquired Pneumonia

Augmentin (amoxicillin/clavulanate) is NOT a first-line agent for community-acquired pneumonia in adults according to the most recent major guidelines, but when used, the dose is amoxicillin/clavulanate 875/125 mg orally twice daily or 2000/125 mg twice daily for resistant organisms.

Adult Dosing

Outpatient CAP

The 2019 ATS/IDSA guidelines do not recommend Augmentin as first-line therapy for outpatient CAP 1. Instead, they recommend:

  • For patients WITHOUT comorbidities: Amoxicillin 1 g every 8 hours (not Augmentin) OR doxycycline 100 mg twice daily
  • For patients WITH comorbidities: Beta-lactam (amoxicillin 1 g every 8 hours, amoxicillin/clavulanate, or cefpodoxime/cefuroxime) PLUS a macrolide OR respiratory fluoroquinolone monotherapy

When Augmentin is used (typically for patients with comorbidities or risk factors for resistant organisms):

  • Standard dosing: Amoxicillin/clavulanate 875/125 mg orally twice daily for 7 days 2
  • High-dose for resistant S. pneumoniae: Amoxicillin/clavulanate 2000/125 mg orally twice daily for 7-10 days 2, 3

The high-dose formulation (2000/125 mg) is pharmacokinetically enhanced to maintain higher amoxicillin serum concentrations and covers S. pneumoniae with penicillin MICs up to 4 mg/L 2, 3.

Inpatient CAP

For hospitalized adults, Augmentin is not mentioned in the 2019 ATS/IDSA guidelines 1. Preferred regimens are:

  • Beta-lactam (ceftriaxone, cefotaxime, or ampicillin-sulbactam) PLUS macrolide
  • Respiratory fluoroquinolone monotherapy

Renal Impairment Adjustments

While not explicitly detailed in the provided guidelines, standard practice requires dose adjustment based on creatinine clearance (refer to FDA labeling for specific adjustments).

Pediatric Dosing

Outpatient CAP (Children ≥5 years)

According to 2011 PIDS/IDSA guidelines 4:

  • Amoxicillin 90 mg/kg/day in 2 divided doses (maximum 4 g/day) is preferred for presumed bacterial CAP
  • Alternative: Amoxicillin/clavulanate 90 mg/kg/day (of amoxicillin component) in 2 divided doses (maximum 4000 mg/day)

Outpatient CAP (Children <5 years)

For preschool-aged children 4:

  • Amoxicillin 90 mg/kg/day in 2 divided doses is preferred
  • Alternative: Amoxicillin/clavulanate 90 mg/kg/day (of amoxicillin component) in 2 divided doses

Inpatient CAP (All Pediatric Ages)

For hospitalized children 4:

Fully immunized children in areas with low penicillin resistance:

  • Preferred: Ampicillin 150-200 mg/kg/day IV every 6 hours OR penicillin G
  • Alternatives: Ceftriaxone or cefotaxime

Not fully immunized OR high penicillin resistance areas:

  • Preferred: Ceftriaxone 50-100 mg/kg/day IV every 12-24 hours OR cefotaxime 150 mg/kg/day every 8 hours

High-Dose Augmentin ES-600 (Pediatric)

FDA-approved for recurrent/persistent acute otitis media (not specifically CAP), but provides relevant dosing 5, 6:

  • Dose: 90 mg/kg/day (of amoxicillin) divided every 12 hours for 10 days
  • Age: 3 months to 12 years, weighing ≤40 kg
  • Formulation: 600 mg amoxicillin/42.9 mg clavulanate per 5 mL

Weight-based dosing examples 5:

  • 8 kg: 3 mL twice daily
  • 16 kg: 6 mL twice daily
  • 24 kg: 9 mL twice daily
  • 40 kg: 15 mL twice daily

Critical caveat: Augmentin ES-600 is NOT interchangeable with other Augmentin suspensions due to different clavulanate ratios 5, 6.

Key Clinical Considerations

When to Consider Augmentin Over Plain Amoxicillin

  1. Beta-lactamase producing organisms: H. influenzae and M. catarrhalis 7, 8
  2. Recent antibiotic exposure: Patients with antibiotic use within 3 months have higher resistance rates 9
  3. Geographic areas with high resistance: Though recent data shows 83.5% susceptibility overall, reaching 90.9% in patients without recent antibiotic use 9

Common Pitfalls

  • Do not substitute different Augmentin formulations: The ES-600 pediatric formulation has a different clavulanate ratio (14:1) than standard formulations (4:1 or 7:1) and cannot be interchanged 5, 6
  • Avoid in viral infections: Augmentin should not be used for viral respiratory syndromes 8
  • Consider shorter durations: Recent evidence supports 3-5 day courses for clinically stable patients rather than traditional 7-10 day regimens 10
  • Take with food: Administer at the start of meals to minimize GI intolerance and enhance clavulanate absorption 5

Duration of Therapy

Modern evidence supports shorter courses 10:

  • 3 days: For patients achieving clinical stability by day 3
  • 5 days: For patients stabilized by day 5
  • 7 days: For other uncomplicated CAP
  • >7 days: Only when complications occur

Resistance Considerations

The 2024 network meta-analysis found that while quinolones and macrolides showed trends toward better clinical response, no antibiotic was conclusively superior 11. However, Augmentin maintains a favorable resistance profile as an "Access" antibiotic per WHO AWaRe classification 8, 9, making it preferable to third-generation cephalosporins from an antimicrobial stewardship perspective when appropriate.

References

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This information is intended for healthcare professionals. Any medical decision-making should rely on clinical judgment and independently verified information. The content provided herein does not replace professional discretion and should be considered supplementary to established clinical guidelines. Healthcare providers should verify all information against primary literature and current practice standards before application in patient care. Dr.Oracle assumes no liability for clinical decisions based on this content.