A 28-year-old woman presents with lower abdominal pain, purulent cervical discharge, and fever for 5 days. Pelvic examination reveals cervical motion tenderness and adnexal tenderness bilaterally. She is hemodynamically stable and has no signs of peritonitis. What is the first-line antibiotic regimen for outpatient management of pelvic inflammatory disease?

Explanation

## First-Line Outpatient Regimen for PID **Key Point:** The CDC-recommended first-line regimen for outpatient PID management is ceftriaxone (single IM dose) plus doxycycline (oral, 14-day course), with or without metronidazole for anaerobic coverage. ### Rationale for Ceftriaxone + Doxycycline 1. **Ceftriaxone 250 mg IM** — covers *Neisseria gonorrhoeae* and many gram-negative organisms; single-dose convenience ensures compliance. 2. **Doxycycline 100 mg PO BD × 14 days** — covers *Chlamydia trachomatis* and other intracellular pathogens; achieves good pelvic tissue penetration. 3. **Optional metronidazole** — added if anaerobic coverage is desired (especially in presence of IUD or tubo-ovarian complex involvement). ### Spectrum Coverage | Organism | Ceftriaxone | Doxycycline | Metronidazole | |----------|-------------|-------------|---------------| | *N. gonorrhoeae* | ✓ | ✗ | ✗ | | *C. trachomatis* | ✗ | ✓ | ✗ | | Anaerobes | ✗ | ✗ | ✓ | | Gram-negative rods | ✓ | ✓ | ✗ | **High-Yield:** This combination covers the two most common pathogens in PID (*N. gonorrhoeae* and *C. trachomatis*) and is recommended by CDC, WHO, and ACOG guidelines for uncomplicated outpatient PID in hemodynamically stable women. **Clinical Pearl:** Doxycycline is contraindicated in pregnancy; in pregnant women with PID, use ceftriaxone + azithromycin instead. [cite:ACOG Practice Bulletin 110]