Which of the following is a reasonable initial outpatient regimen for pelvic inflammatory disease (PID)?

• A. Ceftriaxone plus doxycycline (± metronidazole)
• B. Azithromycin monotherapy
• C. Fluconazole
• D. Amoxicillin alone

Answer: (A)

PID is usually a polymicrobial infection that involves Neisseria gonorrhoeae, Chlamydia trachomatis, and anaerobic organisms, so initial treatment must cover all these possibilities in the outpatient setting. A regimen that does this pairs a cephalosporin with doxycycline to address gonorrhea and chlamydia (and other atypical pathogens), with metronidazole added if anaerobic coverage is desired. Ceftriaxone given intramuscularly provides reliable gonorrheal coverage and helps penetrate the upper genital tract, while doxycycline taken for about 14 days covers chlamydia and broader intracellular organisms. Adding metronidazole broadens coverage for anaerobes that contribute to salpingitis and other PID components. This combination aligns with standard outpatient guidelines and targets the common pathogens likely involved.

Azithromycin monotherapy lacks reliable activity against gonorrhea and may be insufficient for PID; fluconazole targets fungal infections and is irrelevant here; amoxicillin alone does not provide adequate coverage of gonorrhea, chlamydia, or anaerobes in PID.