An alternative empiric regimen for postpartum endometritis includes which of the following?

• A. Doxycycline plus metronidazole
• B. Ceftriaxone plus azithromycin
• C. Vancomycin plus gentamicin
• D. Ampicillin-sulbactam

Answer: (D)

Postpartum endometritis is a polymicrobial infection of the uterus after delivery, so empiric therapy must cover both anaerobic and aerobic genital tract organisms. Ampicillin-sulbactam fits this need because ampicillin targets many Gram-positive organisms, and sulbactam inhibits beta-lactamases produced by anaerobes and some Gram-negatives, expanding coverage to anaerobic bacteria such as Bacteroides as well as common Enterobacteriaceae. This broad spectrum makes it a reliable IV option for empiric treatment in the inpatient postpartum setting, addressing the organisms most likely to cause endometritis after delivery. Other regimens either lack adequate anaerobic coverage or focus on organisms not typically implicated in postpartum endometritis, so they are not as suitable as an initial empiric choice.