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Antibiotic after surgery fails to prove pain relief for endometriosis

NCT ID NCT04554693

What the study statuses mean

This study's is highlighted.

Recruitment status, easiest to join first

Recruiting now
This trial is taking on new participants right now.
Not yet recruiting
Registered, but not yet taking participants.
By invitation only
Not open to general applications. Only people the study team invites can take part.
Paused
Paused for now. It may or may not start again.
Ongoing
Running, but no longer taking on new participants.
Completed
The trial has finished. Results may not be published yet.
Stopped early This study
Stopped early, before it reached the end. That can be for many reasons, including safety.
Cancelled
Cancelled before anyone took part.

Expanded access (not trials)

Expanded access
Not a trial. This treatment can be requested outside a study, case by case, for people who qualify.
Expanded access (paused)
Not a trial. The treatment can normally be requested outside a study, but is unavailable right now.
Expanded access (ended)
Not a trial. The treatment could once be requested outside a study, but no longer can.
Approved
The treatment has been approved, so it is available normally rather than through this programme.

When the status isn't known

Details not published
The full record has not been published yet, so there is little to show here.
Status unknown
This status has not been confirmed recently, so it may be out of date.

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

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.