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Laughing gas shows promise for depression in tiny brain scan study

NCT ID NCT05528718

Symptom relief Sponsor: Unity Health Toronto 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 This study
The trial has finished. Results may not be published yet.
Stopped early
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This status has not been confirmed recently, so it may be out of date.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 27, 2026 · Last updated Jun 27, 2026

Summary

This small pilot study tested whether laughing gas (nitrous oxide) can improve mood in people with major depressive disorder. Eleven participants received either laughing gas or a sedative (midazolam), and researchers used brain scans to look for changes in brain activity. The goal was to see if laughing gas might help ease depression symptoms and understand how it affects the brain.

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.

Participants

11 people

The number who actually took part.

Started

Mar 2023

Finished

Jun 2024

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.

Who is studied

Patient participants were diagnosed as suffering from major depressive disorder (MDD) that meets the criteria of the Diagnosis and Statistical Manual for Mental Disorders (DSM-5), will be eligible to participate in this data collection study. Participants who have agreed to receive N2O treatments as part of the Interventional Psychiatry Clinical Program at St. Michael's Hospital will be approached and recruited.

Ages

18 to 65 years

Sex

Anyone

Healthy volunteers

Not accepted

This study is not open to healthy volunteers. The entry requirements below say who it is open to.

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: * Eligible for main nitrous oxide (SMILE) study Exclusion Criteria: * Contraindication for undergoing MRI scans (e.g., hip circumference \< 180 cm or metal in the body)

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Conditions

The condition(s) this trial relates to.

major depressive disorder

As listed by the trial registrant

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

Major depressive disorder

Contacts and locations

Locations

  • St. Michael's Hospital

    Toronto, Ontario, M5B 1M8, Canada

More trials for these conditions

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