First-Line Treatment for Pneumonia

Treatment Based on Setting and Severity

The American Thoracic Society recommends amoxicillin monotherapy for outpatients with community-acquired pneumonia (CAP) in the community setting 1
For hospitalized patients with non-severe CAP, combined oral therapy with amoxicillin and a macrolide is preferred 1
The British Thoracic Society recommends an intravenous combination of a broad-spectrum β-lactamase stable antibiotic together with a macrolide for patients with severe CAP requiring ICU admission 1, 2
For patients with risk factors for Pseudomonas aeruginosa, an antipseudomonal cephalosporin, acylureidopenicillin/β-lactamase inhibitor, or carbapenem plus either ciprofloxacin or a macrolide with an aminoglycoside is recommended 2, 4

The Infectious Diseases Society of America recommends 7 days of appropriate antibiotics for non-severe and uncomplicated pneumonia 3
For severe microbiologically undefined pneumonia, 10 days of treatment is proposed 1
Treatment should be extended to 14-21 days where Legionella, staphylococcal, or Gram-negative enteric bacilli pneumonia are suspected or confirmed 1
Generally, treatment duration should not exceed 8 days in a responding patient 4

For patients intolerant of β-lactams or macrolides, a fluoroquinolone with enhanced activity against S. pneumoniae together with intravenous benzyl-penicillin is offered as an alternative 1
Fluoroquinolones should be reserved for selected cases due to concerns about resistance development and side effects 1, 2

For patients who fail to improve as expected, a careful review of the clinical history, examination, prescription chart, and investigation results should be conducted 1
When a change in empirical antibiotic treatment is necessary, a macrolide could be added for those treated with amoxicillin monotherapy 1
For those on combination therapy, changing to a fluoroquinolone with effective pneumococcal coverage is an option 1
The addition of rifampicin may be considered for severe pneumonia not responding to combination antibiotic treatment 1