First-Line Antibiotic Treatment for Pneumonia

Treatment Recommendations

The American Thoracic Society recommends amoxicillin as the first-line antibiotic treatment for community-acquired pneumonia in most patients, particularly for outpatient management 1, 2, 3
For healthy adults without comorbidities, the American College of Chest Physicians recommends amoxicillin 1g three times daily as the first choice, or doxycycline 100mg twice daily as an alternative 1
For adults with comorbidities, the American College of Chest Physicians recommends combination therapy with amoxicillin/clavulanate or cephalosporin plus a macrolide or doxycycline 1, 4

The British Thoracic Society recommends combined oral therapy with amoxicillin and a macrolide for hospitalized patients with non-severe community-acquired pneumonia 2, 3
For severe community-acquired pneumonia requiring hospitalization, the European Respiratory Society recommends immediate parenteral antibiotics with a broad-spectrum β-lactamase stable antibiotic plus a macrolide 2, 3, 5

The Infectious Diseases Society of America recommends a duration of therapy of 7 days for most uncomplicated pneumonia, 10 days for severe microbiologically undefined pneumonia, and 14-21 days for legionella, staphylococcal, or gram-negative enteric bacilli pneumonia 2, 4, 5
The American Thoracic Society recommends considering treatment failure if patients on amoxicillin monotherapy do not improve, and adding or substituting a macrolide 1, 2