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PID prescription

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"pelvic inflammatory disease"[MeSH Terms] AND "therapy"

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CDC STI treatment guidelines pelvic inflammatory disease regimens outpatient ceftriaxone doxycycline metronidazole

Reading File
I took "PID" to mean pelvic inflammatory disease. These regimens come from Harrison's 22E and the 2021 CDC STI guidelines. Check them against your local protocol and the patient's allergies, pregnancy status and renal function.

Outpatient (IM or oral) regimen

For mild to moderate PID, give all three drugs:
  • Ceftriaxone 500 mg IM as a single dose (1 g if the patient weighs ≥150 kg)
  • Doxycycline 100 mg PO twice daily for 14 days
  • Metronidazole 500 mg PO twice daily for 14 days
Cefoxitin 2 g IM plus probenecid 1 g PO, both as single doses, can replace ceftriaxone. Keep the doxycycline and metronidazole the same.
Ceftriaxone covers gonorrhea, and doxycycline covers chlamydia. Metronidazole covers anaerobes. In a randomized trial, adding it reduced endometrial anaerobes, M. genitalium and pelvic tenderness. It matters most when bacterial vaginosis or trichomoniasis is present. - Harrison's Principles of Internal Medicine 22E, Pelvic Inflammatory Disease (Table 141-6)

Parenteral (inpatient) regimens

Continue parenteral therapy until 48 hours after clinical improvement, then switch to the oral regimen above to complete 14 days. The CDC PID guidelines list these options:
RegimenDrugs
ACeftriaxone 1 g IV q24h plus doxycycline 100 mg PO/IV q12h plus metronidazole 500 mg PO/IV q12h
BCefotetan 2 g IV q12h or cefoxitin 2 g IV q6h, plus doxycycline 100 mg PO/IV q12h
CClindamycin 900 mg IV q8h plus gentamicin 2 mg/kg IV/IM load, then 1.5 mg/kg q8h (or 3-5 mg/kg once daily)
The CDC also lists ampicillin-sulbactam 3 g IV q6h plus doxycycline as an alternative. Patients with tubo-ovarian abscess need more than 24 hours of inpatient observation.

When to admit

Consider hospitalization if any of these apply:
  • The diagnosis is uncertain and appendicitis or ectopic pregnancy can't be excluded.
  • The patient is pregnant.
  • A pelvic abscess is suspected.
  • Severe illness or vomiting prevents oral therapy.
  • The patient has HIV.
  • The patient can't follow or tolerate an outpatient regimen.
  • The patient has failed outpatient therapy.
In the PEACH trial, outpatient and inpatient treatment gave equivalent outcomes in women with mild to moderate disease. - Harrison's 22E

Other points

  • Start empirical treatment in sexually active young women with pelvic or lower abdominal pain and no other cause, if the exam shows cervical motion, uterine or adnexal tenderness. Don't wait for test results.
  • Follow-up: reassess within 48-72 hours. If there is no improvement, admit and consider imaging or surgery.
  • Partners: treat all sexual partners from the 60 days before symptom onset, empirically for gonorrhea and chlamydia.
  • Testing: test for HIV, syphilis, gonorrhea and chlamydia. Retest at about 3 months.
  • IUD: it can usually stay in place if the patient is responding to treatment.
  • Cephalosporin intolerance: the options are limited, so check the CDC text for alternatives.

Recent literature

A quick PubMed check of the last 2 years found no meta-analysis that overturns these regimens. One is a 2025 meta-analysis of fluoroquinolones (PMID 41327742). Two others cover acupuncture for pain in PID (PMIDs 41551518 and 38295033). They are adjunctive and don't change first-line antibiotics.
If you meant a different "PID" or want a prescription written for a specific scenario (pregnancy, allergy, HIV, tubo-ovarian abscess), tell me and I'll adjust.
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