Question: what is the best antibiotic for pelvic inflammatory disease?
Answer: Ceftriaxone 250 mg IM in a single dose. ... 
Doxycycline 100 mg orally twice a day for 14 days. ... 
Metronidazole 500 mg orally twice a day for 14 days. ... 
Cefoxitin 2 g IM in a single dose and Probenecid, 1 g orally administered concurrently in a single dose.