What is the recommended treatment for acute bronchitis?

Treatment for Acute Bronchitis

Antibiotics should not be prescribed for acute bronchitis in otherwise healthy adults, as this condition is viral in 89-95% of cases and antibiotics provide no meaningful clinical benefit while causing adverse effects and promoting resistance. 1, 2

Initial Assessment: Rule Out Pneumonia First

Before diagnosing acute bronchitis, you must exclude pneumonia by checking vital signs and performing a focused chest examination. 1, 2

• Obtain a chest radiograph if ANY of the following are present: 1, 2

  • Heart rate >100 beats/min
  • Respiratory rate >24 breaths/min
  • Oral temperature >38°C
  • Abnormal lung findings (crackles, egophony, increased tactile fremitus)

• Consider alternative diagnoses: Approximately one-third of patients labeled with "recurrent acute bronchitis" actually have undiagnosed asthma or COPD. 1

Primary Management: Symptomatic Treatment Only

What NOT to Prescribe

• Do not prescribe antibiotics – They shorten cough by only ~0.5 days (12 hours) while increasing adverse events (RR 1.20; 95% CI 1.05-1.36). 1, 2
• Do not prescribe based on purulent sputum – Green/yellow sputum occurs in 89-95% of viral cases and does NOT indicate bacterial infection. 1, 2
• Do not prescribe systemic corticosteroids, inhaled corticosteroids, NSAIDs at anti-inflammatory doses, expectorants, mucolytics, or antihistamines – None have demonstrated benefit. 1, 2

Symptomatic Relief Options

• For bothersome dry cough (especially nocturnal): Codeine or dextromethorphan provide modest relief. 1, 2
• For wheezing only: Short-acting β₂-agonists (e.g., albuterol) may be used in select patients with documented wheezing accompanying the cough. 1, 2
• Environmental measures: Remove irritants and use humidified air. 1

Critical Exception: Pertussis (Whooping Cough)

When pertussis is confirmed or strongly suspected, prescribe a macrolide antibiotic (azithromycin or erythromycin) immediately. 1, 2

• Isolate the patient for 5 days from treatment start. 1, 2
• Early treatment reduces cough paroxysms and prevents disease spread. 1, 2
• Suspect pertussis with: paroxysmal cough, post-tussive vomiting, inspiratory "whoop," or cough >2 weeks. 1

Patient Education (Essential for Satisfaction)

• Explain expected duration: Cough typically lasts 10-14 days and may persist up to 3 weeks, even without antibiotics. 1, 2
• Emphasize viral etiology: Respiratory viruses cause 89-95% of cases; antibiotics cannot treat viruses. 1, 2
• Address antibiotic harms: Antibiotics cause diarrhea, rash, yeast infections, and promote resistance without providing benefit. 1
• Communication matters more than prescriptions: Patient satisfaction depends more on physician-patient communication than receiving antibiotics. 1, 2
• Use terminology strategically: Referring to the illness as a "chest cold" rather than "bronchitis" reduces antibiotic expectations. 1, 2

High-Risk Populations Requiring Different Approach

Consider antibiotics only in high-risk patients with significant comorbidities: 1, 2

• Age ≥75 years with fever AND comorbidities (cardiac failure, insulin-dependent diabetes, serious neurological disorders)
• Immunosuppressed patients
• Patients with COPD or chronic bronchitis meeting ≥2 Anthonisen criteria (increased dyspnea, sputum volume, or sputum purulence) 3, 4

For high-risk patients requiring antibiotics: 2, 3

• First-line: Doxycycline 100 mg twice daily for 7-10 days
• Alternative: Azithromycin or amoxicillin-clavulanate (dose-adjusted for renal function if needed)

Red-Flag Criteria for Reassessment

Advise patients to return if: 1, 2

• Fever persists >3 days – suggests possible bacterial superinfection or pneumonia
• Cough persists >3 weeks – warrants evaluation for asthma, COPD, pertussis, or GERD
• Symptoms worsen rather than gradually improve

Common Pitfalls to Avoid

• Do not assume purulent sputum = bacterial infection – This occurs in 89-95% of viral cases. 1, 2
• Do not use cough duration alone to justify antibiotics – Viral cough normally lasts 10-14 days. 1, 2
• Do not prescribe antibiotics to meet patient expectations – Focus on communication instead. 1, 5
• Do not miss undiagnosed asthma – Consider spirometry in patients with recurrent episodes or nocturnal/exercise-induced cough. 1