Which of the following is considered a first-line therapy for community-acquired pneumonia in outpatients?

• A. Doxycycline
• B. Amoxicillin
• C. Levofloxacin
• D. Azithromycin

Answer: (D)

Outpatient CAP treatment aims to cover the bacteria that commonly cause the illness, including both typical pathogens like Streptococcus pneumoniae and atypical pathogens such as Mycoplasma and Chlamydophila. Azithromycin, a macrolide, provides that broad coverage in a simple, well-tolerated dosing regimen, making it a practical first-line choice for otherwise healthy outpatients. It handles the usual bacteria without needing complex schedules, which is why it’s favored in many exam scenarios. While amoxicillin targets the typical bacteria, it doesn’t reliably cover atypicals, and doxycycline, though effective, is not emphasized as the sole first-line option in this context. Levofloxacin is a broader agent reserved for patients with comorbidities, intolerance to first-line therapy, or prior treatment failure, due to concerns about resistance and side effects.