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Peppermint power: could a simple scent prevent catheters after birth?

NCT ID NCT03319498

Symptom relief Sponsor: Mount Carmel Health System Source: ClinicalTrials.gov ↗

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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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 breathing in peppermint oil vapor could help new mothers urinate on their own after childbirth, reducing the need for a catheter. The trial enrolled 77 postpartum women who were unable to urinate within six hours of delivery. Participants sat on a toilet with peppermint or mineral oil vapor in the bowl. The study was terminated early, so firm conclusions are limited.

What this could mean

Our plain-language read of the trial. This is informational only, not medical advice or a prediction.

Active substance
peppermint oil vapor
What this could lead to
If it worked, this could offer a simple, drug-free way to help new mothers urinate after childbirth without needing a catheter.
What could go wrong
The trial was terminated early, so results are limited. It was a small study, and peppermint oil may not work for everyone or could cause irritation.

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

Not a phased trial

Phase numbers describe drug development. The registry uses this when they do not apply, as it does for trials of devices, procedures or behaviour changes, and for observational studies.

Participants

77 people

The number who actually took part.

Started

Jan 2018

Finished

Feb 2026

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 years and older

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: * postpartum patients at Mount Carmel East, Mount Carmel West, and Mount Carmel St. Ann's Hospital * 18 years or older * able to read and understand English * unable to spontaneously void within 6 hours after vaginal delivery or within 6 hours after straight catheter or within 6 hours after catheter removal for cesarean delivery. Exclusion Criteria: * patients who have an allergy to peppermint oil * patients who have asthma * patients who report sensitivity to smells * patients who have a clinical condition which precludes walking/use of standard toilet

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Conditions

The condition(s) this trial relates to.

Urinary Retention

As listed by the trial registrant

The condition terms exactly as the trial's registrant entered them.

Urinary retention

Contacts and locations

Locations

  • Mount Carmel Health System

    Columbus, Ohio, 43232, United States

More trials for these conditions

Other studies related to the condition(s) this trial covers.