What is the appropriate dosing of Augmentin (amoxicillin‑clavulanate) for acute bronchitis in an adult?

Augmentin Should NOT Be Routinely Prescribed for Acute Bronchitis

Do not prescribe Augmentin (amoxicillin-clavulanate) for uncomplicated acute bronchitis in immunocompetent adults, as antibiotics provide no clinical benefit and increase adverse events. 1

The Evidence Against Antibiotic Use

The most authoritative guidelines are unequivocal on this issue:

• American College of Physicians and CDC (2016) explicitly recommend against antibiotic therapy in acute bronchitis unless pneumonia is suspected 1
• CHEST Expert Panel (2020) found that amoxicillin-clavulanate 500/125 mg three times daily for 10 days showed no significant difference in days with cough compared to placebo (11 days vs 11 days) 2
• Over 90% of acute bronchitis cases are viral in origin 1

Why This Matters for Patient Outcomes

The evidence prioritizes morbidity and quality of life:

• Antibiotics do not shorten cough duration 2, 1
• Antibiotics increase adverse events, particularly gastrointestinal symptoms 1
• Amoxicillin-clavulanate specifically causes more diarrhea and nausea than other antibiotics 3, 4

When Antibiotics ARE Indicated

Only consider antibiotics if:

1. Pneumonia is suspected based on ALL of the following criteria in adults <70 years:

   • Heart rate >100 beats/min
   • Respiratory rate >24 breaths/min
   • Fever >38°C (oral)
   • Abnormal chest exam (rales, egophony, tactile fremitus) 1

2. The bronchitis worsens and a complicating bacterial infection becomes likely 2

Critical Pitfall to Avoid

Purulent (green or yellow) sputum does NOT indicate bacterial infection. This is due to inflammatory cells and sloughed epithelial cells, not bacteria. Do not use sputum color as justification for antibiotics. 1

If Antibiotics Are Truly Needed (Complicated Cases Only)

Only if the above criteria for bacterial infection are met, the dosing would be:

• Standard formulation: Amoxicillin-clavulanate 500/125 mg three times daily for 5-7 days 5
• Extended-release formulation: Amoxicillin-clavulanate 2000/125 mg twice daily for 5 days (for resistant pathogens) 5, 6

However, this scenario applies to acute exacerbations of chronic bronchitis (AECB) in patients with underlying lung disease, NOT uncomplicated acute bronchitis in healthy adults 5, 7.

What TO Prescribe Instead

For symptomatic relief in acute bronchitis:

• Cough suppressants (dextromethorphan, codeine)
• Expectorants (guaifenesin)
• First-generation antihistamines (diphenhydramine)
• Decongestants (phenylephrine)
• NSAIDs like ibuprofen (which performed as well as antibiotics in trials) 2, 1

The bottom line: Augmentin has no role in treating uncomplicated acute bronchitis in immunocompetent adults and causes unnecessary harm through adverse effects and antimicrobial resistance.