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ClinicalTrials.gov public records Last synced Oct 21, 2026, 4:08 AM EDT

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Showing 1–24 of 130 matching trials from the live ClinicalTrials.gov search.
Filters: Intervention: Dextromethorphan (DXM) Clear all
Completed Phase 1 Interventional Accepts healthy volunteers

Effects of Hallucinogens and Other Drugs on Mood and Performance

NCT02033707
View directory record Official record
Conditions
Healthy
Interventions
Hallucinogens and psychoactive substances
Drug
Lead sponsor
Johns Hopkins University
Other
Eligibility
21 Years to 50 Years
Enrollment
20 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2014 – 2019
U.S. locations
1
States / cities
Baltimore, Maryland
Source: ClinicalTrials.gov public record
Updated May 16, 2019 · Synced Oct 21, 2026, 4:08 AM EDT
Withdrawn Phase 4 Interventional

Assessment of Opioid Analgesia in Sickle Cell

NCT00513864
View directory record Official record
Conditions
Sickle Cell Disease
Interventions
Dextromethorphan, Codeine, Morphine
Drug
Lead sponsor
Children's National Research Institute
Other
Eligibility
7 Years to 18 Years
Healthy volunteers
Healthy volunteers not accepted
Timeline
2006 – 2012
U.S. locations
1
States / cities
Washington D.C., District of Columbia
Source: ClinicalTrials.gov public record
Updated Dec 23, 2014 · Synced Oct 21, 2026, 4:08 AM EDT
Completed Phase 3 Interventional Results available

A Study to Assess the Efficacy and Safety of AXS-05 in Subjects With Alzheimer's Disease Agitation

NCT05557409
View directory record Official record
Conditions
Agitation in Patients With Dementia of the Alzheimer's Type, Alzheimer Disease, Agitation
Interventions
AXS-05, Placebo
Drug
Lead sponsor
Axsome Therapeutics, Inc.
Industry
Eligibility
65 Years to 90 Years
Enrollment
408 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2022 – 2024
U.S. locations
53
States / cities
Peoria, Arizona • Tempe, Arizona • Tucson, Arizona + 43 more
Source: ClinicalTrials.gov public record
Updated Aug 13, 2026 · Synced Oct 21, 2026, 4:08 AM EDT
Terminated Phase 2 Interventional Results available

Trial of Dextromethorphan in Rett Syndrome

NCT00593957
View directory record Official record
Conditions
Rett Syndrome
Interventions
Dextromethorphan
Drug
Lead sponsor
Hugo W. Moser Research Institute at Kennedy Krieger, Inc.
Other
Eligibility
2 Years to 15 Years
Enrollment
38 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2004 – 2010
U.S. locations
1
States / cities
Baltimore, Maryland
Source: ClinicalTrials.gov public record
Updated Apr 23, 2014 · Synced Oct 21, 2026, 4:08 AM EDT
Completed Phase 4 Interventional Results available

Effects of Isotretinoin on CYP2D6 Activity

NCT03076021
View directory record Official record
Conditions
CYP2D6 Polymorphism
Interventions
Isotretinoin, dextromethorphan
Drug
Lead sponsor
University of Washington
Other
Eligibility
12 Years and older
Enrollment
33 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2016 – 2023
U.S. locations
1
States / cities
Seattle, Washington
Source: ClinicalTrials.gov public record
Updated Jan 28, 2025 · Synced Oct 21, 2026, 4:08 AM EDT
Not listed Phase 3 Interventional

Independent Studies of Dextromethorphan and of Donepezil Hydrochloride for Rett Syndrome

NCT00069550
View directory record Official record
Conditions
Rett Syndrome
Interventions
dextromethorphan, donepezil hydrochloride
Drug
Lead sponsor
Eunice Kennedy Shriver National Institute of Child Health and Human Development (NICHD)
NIH
Eligibility
1 Year to 15 Years
Enrollment
90 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2004 – 2008
U.S. locations
1
States / cities
Baltimore, Maryland
Source: ClinicalTrials.gov public record
Updated Jun 24, 2005 · Synced Oct 21, 2026, 4:08 AM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

A Phase 1 Study To Evaluate The Effect Of Dimebon On The Pharmacokinetics Of Dextromethorphan

NCT00788047
View directory record Official record
Conditions
Huntington Disease, Alzheimer Disease
Interventions
Dextromethorphan, Dimebon + Dextromethorphan
Drug
Lead sponsor
Pfizer
Industry
Eligibility
18 Years to 55 Years
Enrollment
14 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2008 – 2009
U.S. locations
1
States / cities
New Haven, Connecticut
Source: ClinicalTrials.gov public record
Updated Mar 9, 2009 · Synced Oct 21, 2026, 4:08 AM EDT
Completed Phase 3 Interventional

Safety Study of AVP-923 in the Treatment of IEED (Involuntary Emotional Expression Disorder) Also Known as Pseudobulbar Affect (Episodes of Uncontrolled Crying and/or Laughter)

NCT00056524
View directory record Official record
Conditions
Alzheimer's Disease, Stroke, Parkinson's Disease, Traumatic Brain Injury
Interventions
AVP-923
Drug
Lead sponsor
Avanir Pharmaceuticals
Industry
Eligibility
18 Years to 80 Years
Enrollment
600 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2003 – 2007
U.S. locations
39
States / cities
Phoenix, Arizona • La Jolla, California • Los Angeles, California + 31 more
Source: ClinicalTrials.gov public record
Updated Jul 14, 2016 · Synced Oct 21, 2026, 4:08 AM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

Drug Interaction Study of CT1812 in Healthy Volunteers

NCT03716427
View directory record Official record
Conditions
Healthy Volunteers
Interventions
CT1812, tolbutamide, dextromethorphan, Omeprazole, midazolam
Drug
Lead sponsor
Cognition Therapeutics
Industry
Eligibility
18 Years to 55 Years
Enrollment
16 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2016 – 2017
U.S. locations
1
States / cities
Kalamazoo, Michigan
Source: ClinicalTrials.gov public record
Updated Oct 23, 2018 · Synced Oct 21, 2026, 4:08 AM EDT
Completed Phase 1Phase 2 Interventional Results available

Dextromethorphan for Diabetic Macular Edema

NCT01441102
View directory record Official record
Conditions
Diabetic Macular Edema
Interventions
Dextromethorphan hydrobromide
Drug
Lead sponsor
National Eye Institute (NEI)
NIH
Eligibility
18 Years and older
Enrollment
7 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2011 – 2015
U.S. locations
1
States / cities
Bethesda, Maryland
Source: ClinicalTrials.gov public record
Updated Jul 28, 2020 · Synced Oct 21, 2026, 4:08 AM EDT
Recruiting Early Phase 1 Interventional

Psilocybin-facilitated Treatment for Chronic Pain

NCT05068791
View directory record Official record
Conditions
Fibromyalgia, Primary
Interventions
Psilocybin, Dextromethorphan
Drug
Lead sponsor
University of Alabama at Birmingham
Other
Eligibility
25 Years to 65 Years · Female only
Enrollment
30 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2023 – 2026
U.S. locations
1
States / cities
Birmingham, Alabama
Source: ClinicalTrials.gov public record
Updated Mar 11, 2026 · Synced Oct 21, 2026, 4:08 AM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

Drug Interaction Study With a Potential Alzheimer's Disease Compound

NCT00726726
View directory record Official record
Conditions
Alzheimer Disease
Interventions
Interacting drugs - Cooperstown Cocktail (midazolam, warfarin, (+ vitamin K), caffeine, omeprazole and dextromethorphan), BMS-708163, BMS-708163 + Cooperstown Cocktail
Drug
Lead sponsor
Bristol-Myers Squibb
Industry
Eligibility
18 Years to 45 Years · Male only
Enrollment
22 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2008
U.S. locations
1
States / cities
Hamilton, New Jersey
Source: ClinicalTrials.gov public record
Updated Nov 5, 2008 · Synced Oct 21, 2026, 4:08 AM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

An Open Label, Single Dose, Three Part Study to Assess the Effects of Rolapitant (2 mg/mL IV Solution) on the Pharmacokinetics of Digoxin; Sulfasalazine; and the Cooperstown Cocktail (Midazolam, Omeprazole, Warfarin, Caffeine, and Dextromethorphan in Healthy Subjects

NCT02434861
View directory record Official record
Conditions
Chemotherapy-induced Nausea and Vomiting
Interventions
Rolapitant, Digoxin, Sulfasalazine, Cooperstown Cocktail
Drug
Lead sponsor
Tesaro, Inc.
Industry
Eligibility
18 Years to 55 Years
Enrollment
102 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2015
U.S. locations
1
States / cities
Baltimore, Maryland
Source: ClinicalTrials.gov public record
Updated Aug 25, 2015 · Synced Oct 21, 2026, 4:08 AM EDT
Completed Not applicable Interventional

Dextromethorphan, Gabapentin, and Oxycodone to Treat Opioid-Induced Hyperalgesia

NCT00218374
View directory record Official record
Conditions
Hyperalgesia, Opioid-Related Disorders
Interventions
Gabapentin
Drug
Lead sponsor
National Institute on Drug Abuse (NIDA)
NIH
Eligibility
18 Years to 55 Years
Enrollment
60 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2006 – 2007
U.S. locations
1
States / cities
Los Angeles, California
Source: ClinicalTrials.gov public record
Updated Jan 12, 2017 · Synced Oct 21, 2026, 4:08 AM EDT
Completed Early Phase 1 Interventional Accepts healthy volunteers Results available

Assessing the Pharmacokinetics and Drug Interaction Liability of Kratom, an Opioid-like Natural Product

NCT04392011
View directory record Official record
Conditions
Interaction Drug Food
Interventions
Midazolam HCl, Dextromethorphan HBr, Kratom
Drug · Dietary Supplement
Lead sponsor
Washington State University
Other
Eligibility
18 Years to 55 Years
Enrollment
15 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2019 – 2021
U.S. locations
1
States / cities
Spokane, Washington
Source: ClinicalTrials.gov public record
Updated Oct 19, 2026 · Synced Oct 21, 2026, 4:08 AM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

Drug Interaction Study Between AVP-923 and Itraconazole and Between AVP-786 and Itraconazole in Healthy Adult Subejcts

NCT02402595
View directory record Official record
Conditions
Healthy
Interventions
AVP-923, AVP-786, Itraconazole
Drug
Lead sponsor
Otsuka Pharmaceutical Development & Commercialization, Inc.
Industry
Eligibility
18 Years to 55 Years
Enrollment
24 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2015
U.S. locations
1
States / cities
Overland Park, Kansas
Source: ClinicalTrials.gov public record
Updated Apr 28, 2026 · Synced Oct 21, 2026, 4:08 AM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

A Phase 1 Study Comparing AVP-786 With AVP-923

NCT02336347
View directory record Official record
Conditions
Healthy Volunteer
Interventions
AVP-786, AVP-923
Drug
Lead sponsor
Otsuka Pharmaceutical Development & Commercialization, Inc.
Industry
Eligibility
18 Years to 60 Years
Enrollment
62 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2014 – 2015
U.S. locations
1
States / cities
Dallas, Texas
Source: ClinicalTrials.gov public record
Updated Apr 28, 2026 · Synced Oct 21, 2026, 4:08 AM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

Effects of MNTX on CYP450 2D6 in Metabolizers of Dextromethorphan

NCT01367535
View directory record Official record
Conditions
Healthy Adults
Interventions
SC Methylnaltrexone (MNTX), IV Methylnaltrexone (MNTX), Oral Paroxetine, SC Placebo
Drug
Lead sponsor
Bausch Health Americas, Inc.
Industry
Eligibility
18 Years to 55 Years · Male only
Enrollment
54 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2006
U.S. locations
1
States / cities
Tarrytown, New York
Source: ClinicalTrials.gov public record
Updated Nov 27, 2019 · Synced Oct 21, 2026, 4:08 AM EDT
Completed Phase 2 Interventional Results available

Nuedexta in Treatment-Resistant Major Depression

NCT01882829
View directory record Official record
Conditions
Major Depressive Disorder, Treatment Resistant
Interventions
dextromethorphan/quinidine
Drug
Lead sponsor
James Murrough
Other
Eligibility
18 Years to 65 Years
Enrollment
20 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2013 – 2016
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Jun 11, 2018 · Synced Oct 21, 2026, 4:08 AM EDT
Terminated Phase 2 Interventional Results available

Open-Label Safety Study of AXS-05 in Subjects With TRD (EVOLVE)

NCT04634669
View directory record Official record
Conditions
Treatment Resistant Depression, Major Depressive Disorder
Interventions
AXS-05 (dextromethorphan-bupropion)
Drug
Lead sponsor
Axsome Therapeutics, Inc.
Industry
Eligibility
18 Years and older
Enrollment
181 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2022
U.S. locations
20
States / cities
Little Rock, Arkansas • Redlands, California • Sherman Oaks, California + 17 more
Source: ClinicalTrials.gov public record
Updated Jan 28, 2026 · Synced Oct 21, 2026, 4:08 AM EDT
Completed Phase 1 Interventional Accepts healthy volunteers Results available

Interactions Between Cannabinoids and Cytochrome P450-Metabolized Drugs

NCT04201197
View directory record Official record
Conditions
Drug-Interactions
Interventions
Inje cocktail, THC Cannabis extract, THC/CBD Cannabis Extract
Drug
Lead sponsor
Johns Hopkins University
Other
Eligibility
18 Years to 50 Years
Enrollment
22 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020 – 2022
U.S. locations
1
States / cities
Baltimore, Maryland
Source: ClinicalTrials.gov public record
Updated Jul 24, 2023 · Synced Oct 21, 2026, 4:08 AM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

Study to Evaluate the Effects of 90 mg Intravenous Infusions of GC4419 on the Single Dose Pharmacokinetics of Dextromethorphan in Healthy Adult Subjects

NCT03792971
View directory record Official record
Conditions
Healthy
Interventions
Dextromethorphan HBr, GC4419
Drug
Lead sponsor
Galera Therapeutics, Inc.
Industry
Eligibility
18 Years to 55 Years
Enrollment
13 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2019
U.S. locations
1
States / cities
Miami, Florida
Source: ClinicalTrials.gov public record
Updated Jun 19, 2019 · Synced Oct 21, 2026, 4:08 AM EDT
Terminated Phase 1Phase 2 Interventional

TUSC2-nanoparticles and Erlotinib in Stage IV Lung Cancer

NCT01455389
View directory record Official record
Conditions
Lung Cancer
Interventions
DOTAP:Chol-TUSC2, Erlotinib, Dexamethasone, Diphenhydramine
Drug
Lead sponsor
Genprex, Inc.
Industry
Eligibility
18 Years and older
Enrollment
25 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2014 – 2020
U.S. locations
1
States / cities
Houston, Texas
Source: ClinicalTrials.gov public record
Updated Mar 2, 2022 · Synced Oct 21, 2026, 4:08 AM EDT
Completed Phase 3 Interventional Accepts healthy volunteers Results available

Dextromethorphan as a Novel Non-opioid Adjunctive Agent for Pain Control in Medication Abortion

NCT03480009
View directory record Official record
Conditions
Abortion in First Trimester
Interventions
Dextromethorphan Hydrobromide, Avicel PH101 (Microcrystalline Cellulose NF) for Compounding, Oxycodone
Drug
Lead sponsor
Study Investigator-Sponsor
Other
Eligibility
18 Years and older · Female only
Enrollment
156 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2018 – 2019
U.S. locations
2
States / cities
Pittsburgh, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Aug 6, 2020 · Synced Oct 21, 2026, 4:08 AM EDT