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ClinicalTrials.gov public records Last synced Sep 17, 2026, 5:42 AM EDT

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Showing 1–23 of 23 matching trials from the live ClinicalTrials.gov search.
Local D1 index available.
Filters: Intervention: Nitrous Oxide Gas for Inhalation Clear all
Not listed Phase 1 Interventional Accepts healthy volunteers

Developing Anesthesia as Post Traumatic Stress Disorder (PTSD) Therapy

NCT01736020
View directory record Official record
Conditions
Healthy
Interventions
Dexmedetomidine, Propofol, Ketamine, Nitrous Oxide, Placebo
Drug
Lead sponsor
Southern California Institute for Research and Education
Other
Eligibility
18 Years to 35 Years
Enrollment
293 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2009 – 2017
U.S. locations
1
States / cities
Irvine, California
Source: ClinicalTrials.gov public record
Updated Oct 12, 2016 · Synced Sep 17, 2026, 5:42 AM EDT
Completed Phase 2 Interventional

Nitric Oxide Inhalation Therapy to Relieve Chest Pain in Patients With Coronary Artery Disease

NCT00014040
View directory record Official record
Conditions
Coronary Disease, Myocardial Ischemia
Interventions
Nitric Oxide and INOpulse Delivery System
Drug
Lead sponsor
National Heart, Lung, and Blood Institute (NHLBI)
NIH
Eligibility
Not listed
Enrollment
25 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2001 – 2003
U.S. locations
1
States / cities
Bethesda, Maryland
Source: ClinicalTrials.gov public record
Updated Mar 3, 2008 · Synced Sep 17, 2026, 5:42 AM EDT
Terminated Early Phase 1 Interventional Results available

Nitrous TRD Bipolar Depression

NCT02757521
View directory record Official record
Conditions
Treatment- Resistant Bipolar Disorder, Bipolar Disorder, Bipolar Depressive Disorder
Interventions
Nitrous Oxide, Placebo
Drug
Lead sponsor
Washington University School of Medicine
Other
Eligibility
18 Years to 75 Years
Enrollment
1 participant
Healthy volunteers
Healthy volunteers not accepted
Timeline
2016
U.S. locations
1
States / cities
St Louis, Missouri
Source: ClinicalTrials.gov public record
Updated Jul 4, 2019 · Synced Sep 17, 2026, 5:42 AM EDT
Recruiting Phase 1 Interventional Accepts healthy volunteers

NMDA Receptor Antagonist Nitrous Oxide Targets Affective Brain Circuits

NCT02994433
View directory record Official record
Conditions
Depressive Disorder, Major, Depressive Disorder, Treatment-Resistant
Interventions
Nitrous Oxide, Placebo gas, MRI
Drug · Device
Lead sponsor
Washington University School of Medicine
Other
Eligibility
18 Years to 65 Years
Enrollment
60 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2017 – 2027
U.S. locations
1
States / cities
St Louis, Missouri
Source: ClinicalTrials.gov public record
Updated Apr 28, 2026 · Synced Sep 17, 2026, 5:42 AM EDT
Completed Phase 2 Interventional Results available

Exploring Nitrous Oxide Effects for Post Traumatic Stress Disorder (PTSD)

NCT03375294
View directory record Official record
Conditions
Post Traumatic Stress Disorder
Interventions
Nitrous Oxide
Drug
Lead sponsor
Stanford University
Other
Eligibility
18 Years to 80 Years
Enrollment
3 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018 – 2020
U.S. locations
1
States / cities
Palo Alto, California
Source: ClinicalTrials.gov public record
Updated Jul 23, 2020 · Synced Sep 17, 2026, 5:42 AM EDT
Withdrawn Phase 4 Interventional

Can Nitrous Oxide (Laughing Gas) be Used as a Sedative for GI Endoscopy Procedures?

NCT05396144
View directory record Official record
Conditions
Endoscopy, Colonoscopy
Interventions
5% inhaled nitrous oxide, 50% inhaled nitrous oxide
Drug
Lead sponsor
Stanford University
Other
Eligibility
18 Years and older
Healthy volunteers
Healthy volunteers not accepted
Timeline
2024 – 2025
U.S. locations
1
States / cities
Stanford, California
Source: ClinicalTrials.gov public record
Updated Mar 26, 2026 · Synced Sep 17, 2026, 5:42 AM EDT
Enrolling by invitation Phase 1 Interventional

Nitrous Oxide- Suicidal Ideation

NCT03736538
View directory record Official record
Conditions
Major Depressive Disorder, Depression, Mood Disorders, Suicidal Ideation
Interventions
Nitrous Oxide, Placebo gas
Drug
Lead sponsor
Washington University School of Medicine
Other
Eligibility
18 Years to 65 Years
Enrollment
50 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018 – 2026
U.S. locations
1
States / cities
St Louis, Missouri
Source: ClinicalTrials.gov public record
Updated Dec 21, 2025 · Synced Sep 17, 2026, 5:42 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Role of Instructions in Nitrous Oxide Effects and Choice - 10

NCT00000258
View directory record Official record
Conditions
Opioid-Related Disorders, Substance-Related Disorders
Interventions
Nitrous oxide 10% & placebo, Nitrous oxide 20% & placebo, Nitrous oxide 30% & placebo, Nitrous oxide 40% and placebo
Drug
Lead sponsor
University of Chicago
Other
Eligibility
21 Years to 32 Years
Enrollment
22 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
1996 – 1997
U.S. locations
1
States / cities
Chicago, Illinois
Source: ClinicalTrials.gov public record
Updated May 27, 2015 · Synced Sep 17, 2026, 5:42 AM EDT
Completed Phase 3 Interventional Results available

Nitrous Oxide for the Treatment of Complex Regional Pain Syndrome

NCT03879538
View directory record Official record
Conditions
Complex Regional Pain Syndrome
Interventions
Nitrous Oxide, Oxygen
Drug
Lead sponsor
The Cleveland Clinic
Other
Eligibility
18 Years to 65 Years
Enrollment
44 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2019 – 2022
U.S. locations
1
States / cities
Cleveland, Ohio
Source: ClinicalTrials.gov public record
Updated Feb 8, 2024 · Synced Sep 17, 2026, 5:42 AM EDT
Completed Phase 4 Interventional Accepts healthy volunteers Results available

Nitrous Oxide Treatment for Tinnitus

NCT03365011
View directory record Official record
Conditions
Tinnitus
Interventions
Nitrous oxide gas for inhalation, Placebo gas for inhalation
Drug
Lead sponsor
Washington University School of Medicine
Other
Eligibility
18 Years to 65 Years
Enrollment
40 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2016 – 2017
U.S. locations
1
States / cities
St Louis, Missouri
Source: ClinicalTrials.gov public record
Updated Dec 13, 2018 · Synced Sep 17, 2026, 5:42 AM EDT
Completed Phase 4 Interventional Accepts healthy volunteers Results available

Effect of Nitrous Oxide (N2O) on Intraocular Pressure in Healthy Volunteers

NCT00967694
View directory record Official record
Conditions
Glaucoma, Sedation
Interventions
Nitrous oxide
Drug
Lead sponsor
Oregon Health and Science University
Other
Eligibility
18 Years to 40 Years
Enrollment
20 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2009 – 2011
U.S. locations
1
States / cities
Portland, Oregon
Source: ClinicalTrials.gov public record
Updated Sep 22, 2014 · Synced Sep 17, 2026, 5:42 AM EDT
Completed Not applicable Interventional Results available

Effect of Nitrous Oxide in Treating Neuropathic Pain: A Study in Chronic Low Back Pain Patients

NCT01172600
View directory record Official record
Conditions
Low Back Pain, Radiating Pain
Interventions
Entonox, Oxygen
Other
Lead sponsor
The Cleveland Clinic
Other
Eligibility
18 Years to 80 Years
Enrollment
78 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2011 – 2013
U.S. locations
1
States / cities
Cleveland, Ohio
Source: ClinicalTrials.gov public record
Updated Oct 16, 2016 · Synced Sep 17, 2026, 5:42 AM EDT
Completed Phase 2 Interventional

Nitrous Oxide for the Treatment of Major Depressive Disorder

NCT03869736
View directory record Official record
Conditions
Depression, Major Depressive Disorder
Interventions
Nitrous Oxide, Placebo
Drug
Lead sponsor
Bayside Health
Government
Eligibility
18 Years and older
Enrollment
81 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2019 – 2023
U.S. locations
1
States / cities
Chicago, Illinois
Source: ClinicalTrials.gov public record
Updated Dec 15, 2024 · Synced Sep 17, 2026, 5:42 AM EDT
Not listed Phase 4 Interventional

Nitrous Oxide Prior to Intranasal Midazolam for Moderate Dental Sedation in Pediatric Patients

NCT04083105
View directory record Official record
Conditions
Dental Anxiety, Pain
Interventions
Nitrous Oxide, Midazolam
Drug
Lead sponsor
Children's Hospital Colorado
Other
Eligibility
3 Years to 8 Years
Enrollment
150 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2019 – 2021
U.S. locations
1
States / cities
Aurora, Colorado
Source: ClinicalTrials.gov public record
Updated Sep 9, 2019 · Synced Sep 17, 2026, 5:42 AM EDT
Withdrawn Phase 2 Interventional Accepts healthy volunteers

Nitrous Oxide as Treatment for Fibromyalgia

NCT05357066
View directory record Official record
Conditions
Fibromyalgia, Central Neuropathic Pain
Interventions
Nitrous oxide gas for inhalation, Placebo
Drug
Lead sponsor
University of Chicago
Other
Eligibility
18 Years to 75 Years
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2026
U.S. locations
1
States / cities
Chicago, Illinois
Source: ClinicalTrials.gov public record
Updated May 13, 2026 · Synced Sep 17, 2026, 5:42 AM EDT
Withdrawn Phase 2Phase 3 Interventional Accepts healthy volunteers

Nitrous Oxide for Pain Management During IUD Insertion in Nulliparous Adolescent Women

NCT04089852
View directory record Official record
Conditions
Contraceptive Devices, Long-Acting Reversible Contraception, Analgesia, Adolescent Health, Gynecology
Interventions
Nitrous oxide gas for inhalation, Oxygen Gas for Inhalation
Drug
Lead sponsor
Boston Children's Hospital
Other
Eligibility
14 Years to 24 Years · Female only
Healthy volunteers
Accepts healthy volunteers
Timeline
2021
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Sep 15, 2022 · Synced Sep 17, 2026, 5:42 AM EDT
Terminated Phase 2 Interventional Results available

Nitrous Oxide for PTSD

NCT04378426
View directory record Official record
Conditions
PTSD
Interventions
Nitrous Oxide, Midazolam, Nitrogen, Oxygen, Saline
Drug
Lead sponsor
VA Office of Research and Development
Federal
Eligibility
18 Years to 65 Years
Enrollment
1 participant
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2022
U.S. locations
1
States / cities
Palo Alto, California
Source: ClinicalTrials.gov public record
Updated Mar 2, 2023 · Synced Sep 17, 2026, 5:42 AM EDT
Withdrawn Phase 2 Interventional

N2O for Acute Suicidality and Depression in the ED

NCT05710887
View directory record Official record
Conditions
Suicidal Ideation, Major Depressive Disorder, Treatment Resistant Depression
Interventions
Nitrous oxide gas for inhalation, Placebo
Drug
Lead sponsor
University of Chicago
Other
Eligibility
18 Years to 65 Years
Healthy volunteers
Healthy volunteers not accepted
Timeline
2026
U.S. locations
1
States / cities
Chicago, Illinois
Source: ClinicalTrials.gov public record
Updated Mar 3, 2026 · Synced Sep 17, 2026, 5:42 AM EDT
Completed Phase 2 Interventional Results available

Inhaled Nitrous Oxide for Treatment-Resistant Depression: Optimizing Dosing Strategies

NCT03283670
View directory record Official record
Conditions
Depressive Disorder, Major, Depressive Disorder, Treatment-Resistant
Interventions
Nitrous Oxide 25%, Nitrous Oxide 50%, Placebo Gas
Drug
Lead sponsor
Washington University School of Medicine
Other
Eligibility
18 Years to 75 Years
Enrollment
24 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2016 – 2020
U.S. locations
1
States / cities
St Louis, Missouri
Source: ClinicalTrials.gov public record
Updated Apr 3, 2022 · Synced Sep 17, 2026, 5:42 AM EDT
Completed Phase 4 Interventional Accepts healthy volunteers Results available

Network-Level Effects of Nitrous Oxide in the Human Brain

NCT03435055
View directory record Official record
Conditions
Healthy
Interventions
Nitrous Oxide Gas for Inhalation
Drug
Lead sponsor
University of Michigan
Other
Eligibility
21 Years to 40 Years
Enrollment
21 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2017 – 2019
U.S. locations
1
States / cities
Ann Arbor, Michigan
Source: ClinicalTrials.gov public record
Updated Nov 29, 2021 · Synced Sep 17, 2026, 5:42 AM EDT
Not yet recruiting Phase 4 Interventional

A Randomized, Placebo-controlled Trial of Nitrous Oxide During In-office Bladder Botox Injections

NCT07387315
View directory record Official record
Conditions
Overactive Bladder, Neurogenic Bladder, Urge Incontinence, Pain, Urinary Incontinence, Urinary Bladder, Overactive, Urinary Bladder, Neurogenic, Urinary Bladder Neurogenesis, Urinary Incontinence, Urge, Pelvic Floor Disorders
Interventions
Pro-Nox Nitrous Oxide/Oxygen Delivery System, Standard Care for Bladder Botox Injection, Sham Mask
Drug · Other
Lead sponsor
TriHealth Inc.
Other
Eligibility
18 Years and older · Female only
Enrollment
96 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2026
U.S. locations
2
States / cities
Cincinnati, Ohio
Source: ClinicalTrials.gov public record
Updated Feb 3, 2026 · Synced Sep 17, 2026, 5:42 AM EDT
Withdrawn Phase 2 Interventional Accepts healthy volunteers

Antidepressant Effects of Nitrous Oxide

NCT05357040
View directory record Official record
Conditions
Major Depressive Disorder, Treatment Resistant Depression
Interventions
Nitrous oxide gas for inhalation, Placebo
Drug
Lead sponsor
University of Chicago
Other
Eligibility
18 Years and older
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2026
U.S. locations
1
States / cities
Chicago, Illinois
Source: ClinicalTrials.gov public record
Updated May 13, 2026 · Synced Sep 17, 2026, 5:42 AM EDT
Completed Phase 4 Interventional Results available

Dexmedetomidine and Propofol for Pediatric MRI Sedation

NCT03513757
View directory record Official record
Conditions
Headache, Tumor, Seizure Disorder, Neurofibromatoses, Hydrocephalus, Abdominal Neoplasm, Spine Deformity
Interventions
propofol, Dexmedetomidine, Glycopyrrolate, Lidocaine 1% Injectable Solution, Nitrous Oxide, Sevoflurane
Drug
Lead sponsor
Medical College of Wisconsin
Other
Eligibility
12 Months to 60 Months
Enrollment
40 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018
U.S. locations
1
States / cities
Milwaukee, Wisconsin
Source: ClinicalTrials.gov public record
Updated Feb 20, 2020 · Synced Sep 17, 2026, 5:42 AM EDT