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Showing 25–48 of 24 matching trials from the live ClinicalTrials.gov search.
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Filters: Intervention: Nitrous Oxide Clear all
Completed No phase listed Observational Accepts healthy volunteers

Subjective Effects of Nitrous Oxide in Dental Patients - 17

NCT00000265
View directory record Official record
Conditions
Opioid-Related Disorders, Substance-Related Disorders
Interventions
Not listed
Lead sponsor
University of Chicago
Other
Eligibility
18 Years and older
Enrollment
46 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
1997 – 2002
U.S. locations
1
States / cities
Chicago, Illinois
Source: ClinicalTrials.gov public record
Updated May 26, 2015 · Synced Sep 25, 2026, 10:49 AM EDT
Completed Not applicable Interventional

Nitrous Oxide for Acute Migraine Pain in the Emergency Room (ED)

NCT01287052
View directory record Official record
Conditions
Migraine, Pain
Interventions
Nitrous Oxide
Drug
Lead sponsor
Children's Hospitals and Clinics of Minnesota
Other
Eligibility
8 Years to 18 Years
Enrollment
30 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2011 – 2015
U.S. locations
1
States / cities
Minneapolis, Minnesota
Source: ClinicalTrials.gov public record
Updated Jul 29, 2015 · Synced Sep 25, 2026, 10:49 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 25, 2026, 10:49 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 25, 2026, 10:49 AM EDT
Completed Not applicable Interventional

Acupuncture for the Prevention of Emergence Delirium in Children Undergoing Myringotomy Tube Placement

NCT02383004
View directory record Official record
Conditions
Delirium, Psychomotor Agitation
Interventions
Acupuncture
Other
Lead sponsor
Oregon Health and Science University
Other
Eligibility
1 Year to 6 Years
Enrollment
100 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2015 – 2016
U.S. locations
1
States / cities
Portland, Oregon
Source: ClinicalTrials.gov public record
Updated Jan 17, 2017 · Synced Sep 25, 2026, 10:49 AM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

Compare Ultrasound Assisted Cold Therapy and Lidocaine Injection to Treat Morton's Neuroma

NCT02838758
View directory record Official record
Conditions
Intermetatarsal Neuroma
Interventions
Cryoablation, Lidocaine, Saline
Device · Drug
Lead sponsor
Icahn School of Medicine at Mount Sinai
Other
Eligibility
18 Years to 80 Years
Enrollment
10 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2016 – 2018
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Nov 5, 2018 · Synced Sep 25, 2026, 10:49 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 25, 2026, 10:49 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

Nitrous Oxide Use in Minor Procedures

NCT01911351
View directory record Official record
Conditions
Laceration, Abscess
Interventions
Nitrous Oxide
Drug
Lead sponsor
New York City Health and Hospitals Corporation
Other
Eligibility
3 Years to 12 Years
Enrollment
82 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2013 – 2014
U.S. locations
1
States / cities
The Bronx, New York
Source: ClinicalTrials.gov public record
Updated Apr 10, 2016 · Synced Sep 25, 2026, 10:49 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Effects of Combined Alcohol and Nitrous Oxide Intake - 15

NCT00000263
View directory record Official record
Conditions
Opioid-Related Disorders, Substance-Related Disorders
Interventions
30% Nitrous oxide, 0.25 g/Kg ethanol, 0.5 g/KG ethanol, 0 g/Kg ethanol
Drug · Other
Lead sponsor
University of Chicago
Other
Eligibility
Not listed
Enrollment
11 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
1997 – 1998
U.S. locations
1
States / cities
Chicago, Illinois
Source: ClinicalTrials.gov public record
Updated May 26, 2015 · Synced Sep 25, 2026, 10:49 AM EDT
Completed Not applicable Interventional Results available

Cryoanalgesia to Treat Post-Amputation Phantom Limb Pain: A Department of Defense Funded Multicenter Study

NCT03449667
View directory record Official record
Conditions
Post-Amputation Phantom Limb Pain
Interventions
Cryoneurolysis, Sham Comparator
Device
Lead sponsor
University of California, San Diego
Other
Eligibility
18 Years and older
Enrollment
144 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018 – 2022
U.S. locations
6
States / cities
Palo Alto, California • San Diego, California • Gainesville, Florida + 2 more
Source: ClinicalTrials.gov public record
Updated Feb 16, 2023 · Synced Sep 25, 2026, 10:49 AM EDT
Terminated Phase 1Phase 2 Interventional Results available

Safety and Efficacy of Sodium Nitrite in Sickle Cell Disease

NCT01033227
View directory record Official record
Conditions
Sickle Cell Disease
Interventions
sodium nitrite injection, usp
Drug
Lead sponsor
Children's Hospital Los Angeles
Other
Eligibility
8 Years to 23 Years
Enrollment
5 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009 – 2012
U.S. locations
1
States / cities
Los Angeles, California
Source: ClinicalTrials.gov public record
Updated Oct 16, 2017 · Synced Sep 25, 2026, 10:49 AM EDT
Recruiting Not applicable Interventional

AuriculoTherapy NeuroImaging

NCT06825390
View directory record Official record
Conditions
Low Back Pain, Chronic Low-back Pain, Back Pain, Low, Lumbar Disc Disease, Lumbar Discogenic Pain, Lumbar Pain Syndrome, Lumbar Post-Laminectomy Syndrome, Back Pain Lower Back Chronic, Back Pain Without Radiation, Pain;Back Low;Chronic
Interventions
Cryo-auriculotherapy, Sham auriculotherapy, Experimental auricular stimulation
Device · Other
Lead sponsor
Keith M Vogt
Other
Eligibility
18 Years and older
Enrollment
60 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2025 – 2029
U.S. locations
1
States / cities
Pittsburgh, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Feb 17, 2026 · Synced Sep 25, 2026, 10:49 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 25, 2026, 10:49 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 25, 2026, 10:49 AM EDT
Completed Phase 4 Interventional Results available

A Comparison of Intranasal Midazolam and Nitrous Oxide (N2O) Minimal Sedation for Minor Procedures in a Pediatric Emergency Department

NCT03085563
View directory record Official record
Conditions
Conscious Sedation, Simple Lacerations Less Than 4 cm, Lumbar Punctures, Minor Incision Drainage of Abscesses Not Requiring Extensive Debridement
Interventions
Nitrous Oxide, Midazolam
Drug
Lead sponsor
University of Colorado, Denver
Other
Eligibility
2 Years to 17 Years
Enrollment
63 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2018
U.S. locations
1
States / cities
Aurora, Colorado
Source: ClinicalTrials.gov public record
Updated May 9, 2022 · Synced Sep 25, 2026, 10:49 AM EDT
Withdrawn No phase listed Observational Accepts healthy volunteers

Oxidative Stress in OR Personnel

NCT02654834
View directory record Official record
Conditions
Oxidative Stress
Interventions
Exposure to nitrous oxide or other volatile anesthetics
Other
Lead sponsor
Nationwide Children's Hospital
Other
Eligibility
Not listed
Healthy volunteers
Accepts healthy volunteers
Timeline
2014 – 2016
U.S. locations
1
States / cities
Columbus, Ohio
Source: ClinicalTrials.gov public record
Updated Jan 24, 2018 · Synced Sep 25, 2026, 10:49 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 25, 2026, 10:49 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Effects of Alcohol History on Effects of Nitrous Oxide - 9

NCT00000257
View directory record Official record
Conditions
Alcohol-Related Disorders, Opioid-Related Disorders, Substance-Related Disorders
Interventions
0% N2O and 10% N2O, 0% N2O and 20% N2O, 0% N2O and 30% N2O, 0% N2O and 40% N2O
Drug
Lead sponsor
University of Chicago
Other
Eligibility
21 Years to 37 Years
Enrollment
19 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
1995 – 1997
U.S. locations
1
States / cities
Chicago, Illinois
Source: ClinicalTrials.gov public record
Updated May 27, 2015 · Synced Sep 25, 2026, 10:49 AM EDT
Completed Phase 2 Interventional Results available

Nitrous Oxide Analgesia Vaso-occlusive Crisis

NCT01891812
View directory record Official record
Conditions
Sickle Cell Disease, Vaso-occlusive Crisis
Interventions
Nitrous oxide 50%
Drug
Lead sponsor
Columbia University
Other
Eligibility
8 Years to 18 Years
Enrollment
5 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2013 – 2018
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Jan 27, 2026 · Synced Sep 25, 2026, 10:49 AM EDT
Active, not recruiting Not applicable Interventional

Multi-center Clinical Study to Evaluate the C2 CryoBalloon Focal Ablation System

NCT02514525
View directory record Official record
Conditions
Barrett Esophagus
Interventions
CryoBalloon Ablation System
Device
Lead sponsor
Pentax Medical
Industry
Eligibility
18 Years and older
Enrollment
150 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2016 – 2025
U.S. locations
11
States / cities
Orange, California • Sarasota, Florida • Chicago, Illinois + 8 more
Source: ClinicalTrials.gov public record
Updated Jan 12, 2025 · Synced Sep 25, 2026, 10:49 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 25, 2026, 10:49 AM EDT
Active, not recruiting Not applicable Interventional

Nitrous Oxide For Endoscopic Ablation of Refractory Barrett's Esophagus (NO FEAR-BE)

NCT03554356
View directory record Official record
Conditions
Barrett Esophagus, Intestinal Metaplasia, Esophageal Dysplasia
Interventions
CryoBalloon Focal Ablation System
Device
Lead sponsor
University of North Carolina, Chapel Hill
Other
Eligibility
18 Years and older
Enrollment
70 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018 – 2027
U.S. locations
11
States / cities
Birmingham, Alabama • Washington D.C., District of Columbia • Baltimore, Maryland + 8 more
Source: ClinicalTrials.gov public record
Updated Sep 13, 2026 · Synced Sep 25, 2026, 10:49 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 25, 2026, 10:49 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 25, 2026, 10:49 AM EDT