What is the recommended first-line therapy for Pneumocystis jirovecii pneumonia?

What is the recommended first-line therapy for Pneumocystis jirovecii pneumonia?

• A. Azithromycin
• B. Clarithromycin
• C. Doxycycline
• D. Bactrim

Answer: (D)

High-dose trimethoprim-sulfamethoxazole is the recommended first-line therapy for Pneumocystis jirovecii pneumonia. This combination blocks two steps in folate synthesis, which Pneumocystis relies on, making it highly effective and delivering good lung penetration. In patients with significant hypoxemia, adding systemic corticosteroids improves outcomes. If sulfa antibiotics can’t be used, alternatives exist but are less favored. Other antibiotics like macrolides or doxycycline don’t reliably treat Pneumocystis, which is why TMP-SMX is the best first choice. Treatment is typically continued for about 21 days.

High-dose trimethoprim-sulfamethoxazole is the recommended first-line therapy for Pneumocystis jirovecii pneumonia. This combination blocks two steps in folate synthesis, which Pneumocystis relies on, making it highly effective and delivering good lung penetration. In patients with significant hypoxemia, adding systemic corticosteroids improves outcomes. If sulfa antibiotics can’t be used, alternatives exist but are less favored. Other antibiotics like macrolides or doxycycline don’t reliably treat Pneumocystis, which is why TMP-SMX is the best first choice. Treatment is typically continued for about 21 days.