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Showing 25–44 of 20 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

Effects of Nitrous Oxide: A Dose-Response Analysis - 5

NCT00000253
View directory record Official record
Conditions
Opioid-Related Disorders, Substance-Related Disorders
Interventions
10% N2O, 20% N2O, 30% N2O, 40% N2O
Drug
Lead sponsor
University of Chicago
Other
Eligibility
21 Years to 37 Years
Enrollment
16 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 26, 2026, 7:55 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 26, 2026, 7:55 AM EDT
Not listed Not applicable Interventional

Hand Held Nitrous Oxide Delivery Device

NCT02119403
View directory record Official record
Conditions
Anesthesia
Interventions
There are no other inteventions.
Other
Lead sponsor
Strata Medical Innovations
Industry
Eligibility
3 Years and older
Enrollment
250 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2013 – 2014
U.S. locations
2
States / cities
Lubbock, Texas
Source: ClinicalTrials.gov public record
Updated Apr 20, 2014 · Synced Sep 26, 2026, 7:55 AM EDT
Completed Early Phase 1 Interventional Accepts healthy volunteers

The Measurement of Intraocular Pressure in Normal Children Under General Anesthesia With and Without Nitrous Oxide and Anesthetic Eye Drops

NCT01925391
View directory record Official record
Conditions
Glaucoma, Intraocular Pressure, Anesthesia
Interventions
Tono-pen XL Applanation tonometer + Ocu-film +
Drug
Lead sponsor
University of Miami
Other
Eligibility
1 Year to 18 Years
Enrollment
75 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2013 – 2014
U.S. locations
2
States / cities
Miami, Florida
Source: ClinicalTrials.gov public record
Updated Jun 15, 2014 · Synced Sep 26, 2026, 7:55 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 26, 2026, 7:55 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 26, 2026, 7:55 AM EDT
Completed Phase 2 Interventional Accepts healthy volunteers

Cold Water Immersion Modulates Reinforcing Effects of Nitrous Oxide - 2

NCT00000250
View directory record Official record
Conditions
Opioid-Related Disorders, Substance-Related Disorders
Interventions
0% N2O, 40% N2O
Drug
Lead sponsor
University of Chicago
Other
Eligibility
21 Years to 32 Years
Enrollment
12 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 26, 2026, 7:55 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 26, 2026, 7:55 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 26, 2026, 7:55 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 26, 2026, 7:55 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 26, 2026, 7:55 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 26, 2026, 7:55 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Reinforcing Effects of Brief Exposures to Nitrous Oxide - 8

NCT00000256
View directory record Official record
Conditions
Opioid-Related Disorders, Substance-Related Disorders
Interventions
20% N2O, 40% N2O, 60% N2O, 80% N2O
Drug
Lead sponsor
University of Chicago
Other
Eligibility
22 Years to 34 Years
Enrollment
11 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
1995 – 1996
U.S. locations
1
States / cities
Chicago, Illinois
Source: ClinicalTrials.gov public record
Updated May 27, 2015 · Synced Sep 26, 2026, 7:55 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 26, 2026, 7:55 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 26, 2026, 7:55 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 26, 2026, 7:55 AM EDT
Completed Early Phase 1 Interventional Accepts healthy volunteers

Nitrous Oxide Neuroimaging

NCT06702631
View directory record Official record
Conditions
Anesthesia, Pain, Amnesia
Interventions
Nitrous oxide, Peripheral Nerve Stimulation
Drug · Device
Lead sponsor
Keith M Vogt
Other
Eligibility
18 Years to 59 Years
Enrollment
34 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2025 – 2026
U.S. locations
1
States / cities
Pittsburgh, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Aug 18, 2026 · Synced Sep 26, 2026, 7:55 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 26, 2026, 7:55 AM EDT
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 26, 2026, 7:55 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 26, 2026, 7:55 AM EDT