Community-Acquired Pneumonia Treatment Guidelines

Introduction to Treatment

• The British Thoracic Society recommends a combination of a β-lactam (such as amoxicillin or ceftriaxone) plus a macrolide (such as azithromycin or clarithromycin) as the first-line treatment for community-acquired pneumonia (CAP), with the specific regimen determined by severity and treatment setting 1, 2

Treatment Based on Setting and Severity

• For previously healthy outpatients with no risk factors for drug-resistant pathogens, the American College of Physicians recommends a macrolide (azithromycin or clarithromycin) as first-line therapy 1
• The British Thoracic Society recommends amoxicillin at higher doses for outpatient treatment 2
• For outpatients with comorbidities or recent antibiotic use, the Infectious Diseases Society of America recommends a respiratory fluoroquinolone (levofloxacin) or a β-lactam plus a macrolide 1, 2
• The British Thoracic Society recommends combined therapy with amoxicillin and a macrolide (erythromycin or clarithromycin) for patients requiring hospital admission 3, 2

Duration of Therapy

• The Infectious Diseases Society of America recommends that patients with CAP should be treated for a minimum of 5 days 5, 1
• Patients should be afebrile for 48–72 hours and have no more than 1 CAP-associated sign of clinical instability before discontinuation of therapy 5, 2

Switching from IV to Oral Therapy

• The Infectious Diseases Society of America recommends that patients should be switched from intravenous to oral therapy when they are hemodynamically stable and improving clinically 5, 2

Pathogen-Directed Therapy

• The Infectious Diseases Society of America recommends that once the etiology of CAP has been identified using reliable microbiological methods, antimicrobial therapy should be directed at that specific pathogen 5, 1

Special Considerations

• The American Thoracic Society recommends low-tidal-volume ventilation (6 cm³/kg of ideal body weight) for patients undergoing ventilation who have diffuse bilateral pneumonia or acute respiratory distress syndrome 5, 2

Follow-up

• The British Thoracic Society recommends clinical review should be arranged for all patients at around 6 weeks, either with their general practitioner or in a hospital clinic 3, 2