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Showing 25–48 of 24 matching trials from the live ClinicalTrials.gov search.
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Filters: Intervention: Nitrogen Gas for Inhalation Clear all
Not listed Phase 1Phase 2 Interventional

Prevention of Transfusion Related Acute Gut Injury (TRAGI) in Extremely Low Gestational Age Neonates (ELGANs) Using iNO

NCT02851472
View directory record Official record
Conditions
Anemia
Interventions
Inhaled Nitric Oxide, Placebo
Drug
Lead sponsor
New York Medical College
Other
Eligibility
2 Weeks and older
Enrollment
50 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2019 – 2021
U.S. locations
4
States / cities
Springfield, Massachusetts • Stony Brook, New York • Valhalla, New York + 1 more
Source: ClinicalTrials.gov public record
Updated Apr 23, 2019 · Synced Sep 28, 2026, 10:03 PM EDT
Completed Phase 4 Interventional

Inhaled Nitric Oxide by Oxygen Hood in Neonates

NCT00732537
View directory record Official record
Conditions
Respiratory Failure, Infant, Persistent Fetal Circulation
Interventions
inhaled Nitric Oxide, Oxygen (>90% by hood) - standard therapy
Drug
Lead sponsor
University of Alabama at Birmingham
Other
Eligibility
1 Hour to 1 Week
Enrollment
8 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
1999 – 2005
U.S. locations
1
States / cities
Birmingham, Alabama
Source: ClinicalTrials.gov public record
Updated Aug 11, 2008 · Synced Sep 28, 2026, 10:03 PM EDT
Completed Early Phase 1 Interventional Accepts healthy volunteers Results available

Ventilation and Pulmonary Endothelium Toxicities of E-cigarettes: A Randomized Crossover Pilot Study

NCT02783768
View directory record Official record
Conditions
Pulmonary Disease, Chronic Obstructive, E-cigarettes
Interventions
E-cigarette, Sham, Hyperpolarized 3-Helium, Gadolinium
Device · Other · Drug
Lead sponsor
Columbia University
Other
Eligibility
21 Years to 35 Years
Enrollment
12 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2017 – 2018
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Oct 21, 2020 · Synced Sep 28, 2026, 10:03 PM 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 28, 2026, 10:03 PM 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 28, 2026, 10:03 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Decompression Tables for Diving at Altitude

NCT03390335
View directory record Official record
Conditions
Decompression Sickness, Acute Mountain Sickness
Interventions
Pressure, Breathing Gas
Other
Lead sponsor
Duke University
Other
Eligibility
18 Years to 40 Years
Enrollment
103 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2018 – 2021
U.S. locations
1
States / cities
Durham, North Carolina
Source: ClinicalTrials.gov public record
Updated Dec 13, 2021 · Synced Sep 28, 2026, 10:03 PM 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 28, 2026, 10:03 PM EDT
Recruiting Not applicable Interventional

Carbon Dioxide (CO2) Chemosensitivity and SUDEP

NCT04134754
View directory record Official record
Conditions
Epilepsy, SUDEP
Interventions
6% Carbon dioxide/50% oxygen/balance nitrogen mixture
Other
Lead sponsor
University of Iowa
Other
Eligibility
18 Years to 99 Years
Enrollment
335 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2019 – 2029
U.S. locations
1
States / cities
Iowa City, Iowa
Source: ClinicalTrials.gov public record
Updated Jun 22, 2026 · Synced Sep 28, 2026, 10:03 PM EDT
Recruiting Phase 1Phase 2 Interventional

Intermittent Hypoxia-initiated Plasticity in Humans: A Multi-pronged Therapeutic Approach to Treat Sleep Apnea and Overlapping Co-morbidities

NCT05558501
View directory record Official record
Conditions
Obstructive Sleep Apnea
Interventions
Mild Intermittent Hypoxia, Sham MIH
Other
Lead sponsor
VA Office of Research and Development
Federal
Eligibility
30 Years to 60 Years
Enrollment
60 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2023 – 2027
U.S. locations
1
States / cities
Detroit, Michigan
Source: ClinicalTrials.gov public record
Updated Dec 3, 2025 · Synced Sep 28, 2026, 10:03 PM 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 28, 2026, 10:03 PM EDT
Withdrawn Phase 2 Interventional

Effects of Nitric Oxide on the Endothelium During Hemolysis.

NCT03748082
View directory record Official record
Conditions
Endothelial Dysfunction, Hemolysis Intravascular, Cardiovascular Diseases, Cardiovascular Risk Factor
Interventions
Nitric Oxide, Reactive Hyperemia Index, Endothelial Cells Collection
Drug · Diagnostic Test · Procedure
Lead sponsor
Massachusetts General Hospital
Other
Eligibility
18 Years and older
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018 – 2023
U.S. locations
2
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Dec 1, 2025 · Synced Sep 28, 2026, 10:03 PM EDT
Completed Phase 3 Interventional Results available

Nitric Oxide Administration for Acute Respiratory Distress Syndrome

NCT00240487
View directory record Official record
Conditions
Acute Respiratory Distress Syndrome
Interventions
Nitric Oxide, No Intervention
Drug · Other
Lead sponsor
Children's Hospital of Philadelphia
Other
Eligibility
1 Month to 18 Years
Enrollment
52 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2000 – 2008
U.S. locations
1
States / cities
Philadelphia, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Apr 23, 2015 · Synced Sep 28, 2026, 10:03 PM 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 28, 2026, 10:03 PM EDT
Completed Phase 2Phase 3 Interventional Results available

Nitric Oxide Administration During Pediatric Cardiopulmonary Bypass Surgery to Prevent Platelet Activation

NCT03455218
View directory record Official record
Conditions
Inflammation, Platelet Dysfunction
Interventions
Nitric Oxide, Placebo, INOmax
Drug · Device
Lead sponsor
Medical College of Wisconsin
Other
Eligibility
Up to 1 Year
Enrollment
40 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018 – 2019
U.S. locations
1
States / cities
Milwaukee, Wisconsin
Source: ClinicalTrials.gov public record
Updated Aug 12, 2020 · Synced Sep 28, 2026, 10:03 PM 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 28, 2026, 10:03 PM 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 28, 2026, 10:03 PM EDT
Active, not recruiting Phase 2 Interventional Accepts healthy volunteers

Diffuse Optical Monitoring With Inhaled Nitric Oxide

NCT03023449
View directory record Official record
Conditions
Stroke
Interventions
Nitric Oxide
Drug
Lead sponsor
Steven Messe
Other
Eligibility
18 Years to 99 Years
Enrollment
40 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2017 – 2026
U.S. locations
1
States / cities
Philadelphia, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Aug 23, 2025 · Synced Sep 28, 2026, 10:03 PM 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 28, 2026, 10:03 PM EDT
Completed No phase listed Observational Accepts healthy volunteers

Utility of Lung Clearance Index Score as a Noninvasive Marker of Deployment Lung Disease

NCT03012958
View directory record Official record
Conditions
Bronchiolitis, Pneumonitis, Dyspnea
Interventions
Lung clearance index (LCI)
Other
Lead sponsor
National Jewish Health
Other
Eligibility
18 Years and older
Enrollment
73 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2014 – 2018
U.S. locations
1
States / cities
Denver, Colorado
Source: ClinicalTrials.gov public record
Updated Jan 7, 2021 · Synced Sep 28, 2026, 10:03 PM EDT
Terminated Phase 2 Interventional Results available

Inhaled Nitric Oxide After Out-of-Hospital Cardiac Arrest

NCT03079102
View directory record Official record
Conditions
Heart Arrest, Out-Of-Hospital
Interventions
Nitric Oxide, Nitrogen
Drug
Lead sponsor
Cameron Dezfulian
Other
Eligibility
18 Years and older
Enrollment
57 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2020
U.S. locations
5
States / cities
McKeesport, Pennsylvania • Monroeville, Pennsylvania • Pittsburgh, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Apr 24, 2022 · Synced Sep 28, 2026, 10:03 PM EDT
Terminated Phase 2 Interventional

Inhaled Nitric Oxide for Pediatric Painful Sickle Crisis

NCT00142051
View directory record Official record
Conditions
Sickle Cell Disease
Interventions
nitric oxide, oxygen
Drug
Lead sponsor
Boston Children's Hospital
Other
Eligibility
9 Years to 22 Years
Enrollment
18 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2005 – 2013
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Feb 22, 2023 · Synced Sep 28, 2026, 10:03 PM 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 28, 2026, 10:03 PM 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 28, 2026, 10:03 PM 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 28, 2026, 10:03 PM EDT