For outpatient CAP treated with amoxicillin or doxycycline, what is the recommended duration of therapy?

• A. 10–14 days.
• B. 5–7 days.
• C. 3 days.
• D. 21 days.

Answer: (B)

The main idea is that for uncomplicated outpatient CAP treated with amoxicillin or doxycycline, a short course is enough. Five to seven days of therapy is typically sufficient because these drugs cover the common bacteria causing outpatient CAP and patients usually improve within a few days. Extending treatment beyond a week rarely improves cure rates and can increase side effects, cost, and the risk of antimicrobial resistance, so clinicians aim to stop around day 5–7 once the patient is clinically stable.

Why not longer durations? Twenty-one days is excessive for most outpatient cases and increases risk without added benefit. Ten to fourteen days goes beyond what’s needed for mild illness and unnecessarily prolongs exposure. Three days is too short to reliably eradicate the infection in most patients, who commonly still have fever or symptoms or may relapse if treated for such a short period. If a patient improves quickly, stopping at 5 days is appropriate; if they’re slower to respond, extending toward 7 days is reasonable but usually not beyond that in otherwise healthy outpatients.