Antibiotic after surgery fails to prove pain relief for endometriosis
NCT ID NCT04554693
First seen Jun 26, 2026 · Last updated Jun 27, 2026 · Updated 1 time
Summary
This study tested whether taking a low dose of the antibiotic metronidazole for 14 days after endometriosis surgery could lower pain. It included 78 women aged 18-50 scheduled for surgery. The trial was terminated early, so the results are not conclusive.
What this could mean
Our plain-language read of the trial. This is informational only, not medical advice or a prediction.
- Active substance
- metronidazole (an antibiotic)
- What this could lead to
- If it had worked, this could have pointed to a simple, low-cost way to ease pain after endometriosis surgery.
- What could go wrong
- The trial was terminated early, so we don't have clear evidence it works. It was also a small study, and metronidazole can cause side effects like nausea or allergic reactions.
This is an AI summary of the original study and may miss details. Read our disclaimer.
Study facts
What this study's own registry entry says, in plain language.
- Phase
-
Phase 4
Runs after approval, following long-term safety and how well the treatment works in everyday use.
- Participants
-
78 people
The number who actually took part.
- Started
-
Oct 2020
- Finished
-
Oct 2023
- Lead sponsor
-
Other sponsor
The registry's catch-all category, for sponsors it does not file as a company, a government agency, or a research network.
Who can take part
This study's own entry requirements. Only the study team can say for certain whether you qualify.
- Ages
-
18 to 50 years
- Sex
-
Female participants only
- Healthy volunteers
-
Accepted
You do not need to have the condition being studied to take part.
Show the full entry requirements Hide the full entry requirements
Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.
Inclusion Criteria: * Able to give informed consent * Women aged 18-50 years old * Scheduled to undergo excision of endometriosis * Able to read and write in English and or Spanish * Pain score \> 2 on a 10 point visual analogue scale at baseline * Negative screening by CAGE questionnaire Exclusion Criteria: * Refusal to surgery * Contraindication to surgery * Known allergy to metronidazole * Known allergy to any component in gelatin placebo capsules * Scheduled hysterectomy * Endometriosis excision surgery within the last 3 months * Elevated serum creatinine * Abnormal liver function test greater than 2 times the normal * Current pregnancy * Breastfeeding * Use of Disulfiram within the last 2 weeks * History of Cockayne syndrome * Inability to abstain from alcohol during the use of study drug
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Conditions
The condition(s) this trial relates to.
As listed by the trial registrant
The condition terms exactly as the trial's registrant entered them.
Contacts and locations
Locations
-
University of Louisville Hospital
Louisville, Kentucky, 40202, United States
More trials for these conditions
Other studies related to the condition(s) this trial covers.
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- Appendix: the hidden driver of endometriosis pain?
- Allergy pill put to the test against endometriosis pain
- Can ultrasound and tissue clues reveal which endometriosis lesions carry cancer risk?
- Can AI personalize exercise to ease pelvic pain?
- Can AI learn to spot endometriosis and fibroids on ultrasound?