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Showing 1–24 of 44 matching trials from the live ClinicalTrials.gov search.
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Filters: Intervention: Inhaled nitrous oxide Clear all
Completed Not applicable Interventional Accepts healthy volunteers

Sevoflurane vs Nitrous Oxide Inhalation at Subanesthetic Concentrations - 11

NCT00000259
View directory record Official record
Conditions
Opioid-Related Disorders, Substance-Related Disorders
Interventions
15 % Nitrous oxide, 0.3 % Sevoflurane, 30% Nitrous oxide, 0.6% Sevoflurane, Placebo
Drug · Other
Lead sponsor
University of Chicago
Other
Eligibility
21 Years to 39 Years
Enrollment
12 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 6, 2026, 3:07 AM EDT
Completed Phase 3 Interventional Results available

A Comparison of Oral Sedation-related Events of Three Multiagent Oral Sedation Regimens in Pediatric Dental Patients

NCT05126459
View directory record Official record
Conditions
Anxiety, Dental, Dental Decay
Interventions
Regimen 1, Regimen #2, Regimen #3
Combination Product
Lead sponsor
Loma Linda University
Other
Eligibility
3 Years to 7 Years
Enrollment
60 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2022 – 2023
U.S. locations
1
States / cities
Loma Linda, California
Source: ClinicalTrials.gov public record
Updated Oct 1, 2024 · Synced Sep 6, 2026, 3:07 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 6, 2026, 3:07 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Withdrawn Phase 2Phase 3 Interventional Accepts healthy volunteers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 6, 2026, 3:07 AM EDT
Completed Not applicable Interventional

Effects of Combined Sevoflurane and Nitrous Oxide Inhalation - 14

NCT00000262
View directory record Official record
Conditions
Opioid-Related Disorders, Substance-Related Disorders
Interventions
30% Nitrous oxide, 0.4% Sevoflurane, 0.2% sevoflurane, Placebo
Drug · Other
Lead sponsor
University of Chicago
Other
Eligibility
Not listed
Enrollment
20 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
1996 – 1999
U.S. locations
1
States / cities
Chicago, Illinois
Source: ClinicalTrials.gov public record
Updated May 26, 2015 · Synced Sep 6, 2026, 3:07 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 6, 2026, 3:07 AM EDT
Completed Phase 2 Interventional Accepts healthy volunteers

Effects of Subanesthetic Concentrations of Isoflurane/Nitrous Oxide - 3

NCT00000251
View directory record Official record
Conditions
Opioid-Related Disorders, Substance-Related Disorders
Interventions
30% N2O, 0.2% isoflurane, 0.4% isoflurane, 100% oxygen
Drug · Other
Lead sponsor
University of Chicago
Other
Eligibility
21 Years to 32 Years
Enrollment
10 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
1994 – 1996
U.S. locations
1
States / cities
Chicago, Illinois
Source: ClinicalTrials.gov public record
Updated Dec 1, 2015 · Synced Sep 6, 2026, 3:07 AM EDT
Completed Phase 2 Interventional Accepts healthy volunteers

Effects of Subanesthetic Concentrations of Nitrous Oxide - 1

NCT00000249
View directory record Official record
Conditions
Opioid-Related Disorders, Substance-Related Disorders
Interventions
20% N2O, 30% N2O, 40% N2O
Drug
Lead sponsor
University of Chicago
Other
Eligibility
21 Years to 37 Years
Enrollment
10 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
1993 – 1995
U.S. locations
1
States / cities
Chicago, Illinois
Source: ClinicalTrials.gov public record
Updated May 27, 2015 · Synced Sep 6, 2026, 3:07 AM EDT
Recruiting Phase 1 Interventional

Inhaled Nitric Oxide in Acute Ischemic Stroke Patients Undergoing Mechanical Thrombectomy

NCT05871606
View directory record Official record
Conditions
Cerebrovascular Disorders, Acute Cerebrovascular Disease
Interventions
iNO
Drug
Lead sponsor
Wake Forest University Health Sciences
Other
Eligibility
18 Years to 80 Years
Enrollment
36 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2026 – 2028
U.S. locations
2
States / cities
Charlotte, North Carolina
Source: ClinicalTrials.gov public record
Updated Apr 22, 2026 · Synced Sep 6, 2026, 3:07 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 6, 2026, 3:07 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 6, 2026, 3:07 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 6, 2026, 3:07 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 6, 2026, 3:07 AM EDT
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 6, 2026, 3:07 AM EDT
Completed Not applicable Interventional Results available

Nitrous Oxide Induction Induces Amnesia in Pediatric Patients

NCT02050152
View directory record Official record
Conditions
Amnesia
Interventions
Nitrous Oxide 0%, Nitrous oxide 33%, Nitrous oxide 66%
Drug
Lead sponsor
State University of New York at Buffalo
Other
Eligibility
6 Years to 12 Years
Enrollment
90 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2013
U.S. locations
1
States / cities
Buffalo, New York
Source: ClinicalTrials.gov public record
Updated Jun 29, 2026 · Synced Sep 6, 2026, 3:07 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 6, 2026, 3:07 AM EDT
Recruiting Phase 2 Interventional Accepts healthy volunteers

Effect of Nitrous Oxide on Aggression.

NCT06118567
View directory record Official record
Conditions
Intermittent Explosive Disorder
Interventions
Nitrous oxide, Room Air
Drug
Lead sponsor
Ohio State University
Other
Eligibility
21 Years to 55 Years
Enrollment
50 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2022 – 2027
U.S. locations
1
States / cities
Columbus, Ohio
Source: ClinicalTrials.gov public record
Updated Mar 26, 2025 · Synced Sep 6, 2026, 3:07 AM EDT
Completed Phase 2 Interventional Accepts healthy volunteers

Lack of Acute Tolerance Development to Effects of Nitrous Oxide - 4

NCT00000252
View directory record Official record
Conditions
Opioid-Related Disorders, Substance-Related Disorders
Interventions
0% N2O, 10% N2O, 20% N2O, 30% N2O, 40% N2O
Drug
Lead sponsor
University of Chicago
Other
Eligibility
21 Years to 29 Years
Enrollment
11 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
1994 – 1996
U.S. locations
1
States / cities
Chicago, Illinois
Source: ClinicalTrials.gov public record
Updated May 27, 2015 · Synced Sep 6, 2026, 3:07 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 6, 2026, 3:07 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 6, 2026, 3:07 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 6, 2026, 3:07 AM EDT
Terminated Not applicable Interventional

Adjunctive Nitrous Oxide During ED Incision and Drainage of Abscess

NCT03127371
View directory record Official record
Conditions
Abscess
Interventions
Nitrous Oxide, Oxygen
Drug
Lead sponsor
Albert Einstein Healthcare Network
Other
Eligibility
18 Years and older
Enrollment
41 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2016 – 2021
U.S. locations
1
States / cities
Philadelphia, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Apr 26, 2021 · Synced Sep 6, 2026, 3:07 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 6, 2026, 3:07 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 6, 2026, 3:07 AM EDT