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Showing 1–24 of 129 matching trials from the live ClinicalTrials.gov search.
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Filters: Intervention: Dextromethorphan (DXM) Clear all
Completed Phase 2 Interventional Results available

Efficacy, Safety and Tolerability Study of AVP-923 (Dextromethorphan/Quinidine) for Treatment of Symptoms of Agitation in Participants With Alzheimer's Disease

NCT01584440
View directory record Official record
Conditions
Agitation, Alzheimer's Disease
Interventions
AVP-923-20, Placebo, AVP-923-30
Drug
Lead sponsor
Avanir Pharmaceuticals
Industry
Eligibility
50 Years to 90 Years
Enrollment
220 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2012 – 2014
U.S. locations
44
States / cities
Phoenix, Arizona • Sun City, Arizona • Fresno, California + 36 more
Source: ClinicalTrials.gov public record
Updated Nov 25, 2021 · Synced Sep 2, 2026, 5:32 AM EDT
Completed Phase 3 Interventional

Assessing Clinical Outcomes in Alzheimer's Disease Agitation

NCT04797715
View directory record Official record
Conditions
Agitation in Patients With Dementia of the Alzheimer's Type, Alzheimer Disease, Agitation,Psychomotor
Interventions
AXS-05, Placebo
Drug
Lead sponsor
Axsome Therapeutics, Inc.
Industry
Eligibility
65 Years to 90 Years
Enrollment
178 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2022
U.S. locations
61
States / cities
Sun City, Arizona • Tucson, Arizona • Chula Vista, California + 55 more
Source: ClinicalTrials.gov public record
Updated Nov 28, 2023 · Synced Sep 2, 2026, 5:32 AM EDT
Completed Phase 2 Interventional

Trial of Naltrexone and Dextromethorphan for Gulf War Illness

NCT02206490
View directory record Official record
Conditions
Gulf War Illness
Interventions
naltrexone, Dextromethorphan
Drug
Lead sponsor
East Carolina University
Other
Eligibility
18 Years to 100 Years
Enrollment
60 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2012 – 2016
U.S. locations
1
States / cities
Greenville, North Carolina
Source: ClinicalTrials.gov public record
Updated Mar 2, 2016 · Synced Sep 2, 2026, 5:32 AM EDT
Completed Phase 2 Interventional Results available

Nuedexta for the Prevention and Modification of Disease Progression in Episodic Migraine

NCT02176018
View directory record Official record
Conditions
Episodic Migraine
Interventions
Dextromethorphan and quinidine, Placebo
Drug
Lead sponsor
Cady, Roger, M.D.
Individual
Eligibility
18 Years to 65 Years
Enrollment
76 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2014 – 2017
U.S. locations
5
States / cities
Rockford, Illinois • Ridgeland, Mississippi • City of Saint Peters, Missouri + 2 more
Source: ClinicalTrials.gov public record
Updated Apr 2, 2018 · Synced Sep 2, 2026, 5:32 AM EDT
Completed Phase 1 Interventional

Pharmacokinetic Study to Evaluate the Effect of a Single Dose of Guselkumab (CNTO 1959) on CYP 450 Enzyme Activities After Subcutaneous Administration in Participants With Psoriasis

NCT02397382
View directory record Official record
Conditions
Psoriasis
Interventions
Guselkumab, Midazolam, Warfarin, Omeprazole, Dextromethorphan, Caffeine
Drug
Lead sponsor
Janssen Research & Development, LLC
Industry
Eligibility
18 Years to 65 Years
Enrollment
16 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2015 – 2016
U.S. locations
8
States / cities
Anniston, Alabama • North Hollywood, California • Orlando, Florida + 5 more
Source: ClinicalTrials.gov public record
Updated Sep 19, 2017 · Synced Sep 2, 2026, 5:32 AM EDT
Completed Phase 2 Interventional Results available

Clinical Neuropharmacology of Pain in Spinal Cord Injury- Dextromethorphan Dose Response Clinical Trial

NCT01435798
View directory record Official record
Conditions
Central Neuropathic Pain, Allodynia, Spinal Cord Injury
Interventions
Dextromethorphan
Drug
Lead sponsor
Brigham and Women's Hospital
Other
Eligibility
18 Years to 70 Years
Enrollment
26 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2003 – 2008
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Dec 7, 2025 · Synced Sep 2, 2026, 5:32 AM EDT
Completed Phase 2 Interventional

Characterization of Pain Processing Mechanisms in Irritable Bowel Syndrome

NCT00108446
View directory record Official record
Conditions
Irritable Bowel Syndrome
Interventions
dextromethorphan, naloxone, fentanyl, lidocaine
Drug
Lead sponsor
US Department of Veterans Affairs
Federal
Eligibility
18 Years and older
Healthy volunteers
Healthy volunteers not accepted
Timeline
2003 – 2006
U.S. locations
1
States / cities
Gainesville, Florida
Source: ClinicalTrials.gov public record
Updated Jan 20, 2009 · Synced Sep 2, 2026, 5:32 AM EDT
Completed Phase 3 Interventional Results available

Open-Label Safety Study of AXS-05 in Subjects With Depression

NCT04039022
View directory record Official record
Conditions
Major Depressive Disorder, Treatment Resistant Depression, Depression
Interventions
AXS-05 (dextromethorphan and bupropion) oral tablets
Drug
Lead sponsor
Axsome Therapeutics, Inc.
Industry
Eligibility
18 Years to 65 Years
Enrollment
876 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2019 – 2020
U.S. locations
51
States / cities
Phoenix, Arizona • Little Rock, Arkansas • Bellflower, California + 46 more
Source: ClinicalTrials.gov public record
Updated Oct 11, 2022 · Synced Sep 2, 2026, 5:32 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 23, 2005 · Synced Sep 2, 2026, 5:32 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 11, 2017 · Synced Sep 2, 2026, 5:32 AM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

Drug Interaction Study of Darunavir/Ritonavir and Lopinavir/Ritonavir on GSK2248761 PK and CYP450 Probe Drugs

NCT00920088
View directory record Official record
Conditions
Healthy Subjects, Infection, Human Immunodeficiency Virus
Interventions
darunavir/ritonavir, lopinavir/ritonavir, Midazolam, Dextromethorphan, Flurbiprofen, GSK2248761
Drug
Lead sponsor
GlaxoSmithKline
Industry
Eligibility
18 Years to 50 Years
Enrollment
24 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2009
U.S. locations
1
States / cities
Baltimore, Maryland
Source: ClinicalTrials.gov public record
Updated Nov 2, 2010 · Synced Sep 2, 2026, 5:32 AM EDT
Completed Phase 3 Interventional

Safety and Efficacy of AVP-923 for Pseudobulbar Affect in Multiple Sclerosis Patients

NCT00050232
View directory record Official record
Conditions
Multiple Sclerosis
Interventions
AVP-923
Drug
Lead sponsor
Avanir Pharmaceuticals
Industry
Eligibility
18 Years to 68 Years
Enrollment
96 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2002 – 2004
U.S. locations
20
States / cities
Phoenix, Arizona • Washington D.C., District of Columbia • Fort Lauderdale, Florida + 17 more
Source: ClinicalTrials.gov public record
Updated Jul 13, 2016 · Synced Sep 2, 2026, 5:32 AM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

Drug Interaction Study of Multiple Doses of Isavuconazole and Single Dose of Dextromethorphan in Healthy Adult Subjects

NCT01651325
View directory record Official record
Conditions
Pharmacokinetics of Isavuconazole, Pharmacokinetics of Dextromethorphan, Healthy Adult Volunteers
Interventions
Isavuconazole, dextromethorphan
Drug
Lead sponsor
Astellas Pharma Global Development, Inc.
Industry
Eligibility
18 Years to 55 Years
Enrollment
24 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2012
U.S. locations
1
States / cities
Baltimore, Maryland
Source: ClinicalTrials.gov public record
Updated Feb 22, 2015 · Synced Sep 2, 2026, 5:32 AM EDT
Completed Phase 1Phase 2 Interventional Results available

Phase Ib/2a Drug-drug Interaction Study of a Combination of 45mg Dextromethorphan With 105 mg Bupropion

NCT05976646
View directory record Official record
Conditions
Addiction, Opioid Use, Substance Use Disorders, Opioid Use Disorder
Interventions
Placebo, Auvelity
Drug
Lead sponsor
Virginia Commonwealth University
Other
Eligibility
18 Years to 65 Years
Enrollment
18 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2023 – 2025
U.S. locations
1
States / cities
Richmond, Virginia
Source: ClinicalTrials.gov public record
Updated Aug 18, 2026 · Synced Sep 2, 2026, 5:32 AM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

A Drug Interaction Study of LY3871801 in Healthy Participants

NCT05602675
View directory record Official record
Conditions
Healthy
Interventions
LY3871801, Methotrexate, Warfarin, Dextromethorphan, Midazolam, Repaglinide
Drug
Lead sponsor
Eli Lilly and Company
Industry
Eligibility
18 Years to 65 Years
Enrollment
39 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2022 – 2023
U.S. locations
1
States / cities
Dallas, Texas
Source: ClinicalTrials.gov public record
Updated Apr 17, 2023 · Synced Sep 2, 2026, 5:32 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 23, 2023 · Synced Sep 2, 2026, 5:32 AM EDT
Terminated Phase 4 Interventional Results available

Dextromethorphan Pediatric Acute Cough Study

NCT02651116
View directory record Official record
Conditions
Cough
Interventions
Dextromethorphan Hydrobromide, Placebo, Cough recording device
Drug · Device
Lead sponsor
Pfizer
Industry
Eligibility
6 Years to 11 Years
Enrollment
131 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2016 – 2020
U.S. locations
18
States / cities
DeLand, Florida • Orlando, Florida • Blackfoot, Idaho + 13 more
Source: ClinicalTrials.gov public record
Updated Apr 27, 2021 · Synced Sep 2, 2026, 5:32 AM EDT
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 15, 2019 · Synced Sep 2, 2026, 5:32 AM EDT
Completed Phase 2 Interventional Results available

Clinical Trial Nuedexta in Subjects With ALS

NCT01806857
View directory record Official record
Conditions
Amyotrophic Lateral Sclerosis (ALS)
Interventions
Nuedexta, Matching Placebo
Drug
Lead sponsor
Center for Neurologic Study, La Jolla, California,
Other
Eligibility
18 Years and older
Enrollment
90 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2013 – 2015
U.S. locations
7
States / cities
San Francisco, California • Washington D.C., District of Columbia • Grand Rapids, Michigan + 4 more
Source: ClinicalTrials.gov public record
Updated Mar 23, 2017 · Synced Sep 2, 2026, 5:32 AM EDT
Completed Phase 3 Interventional Results available

An Open-Label Immunogenicity and Pharmacokinetics Study of Daclizumab High Yield Process Prefilled Syringe in Relapsing Remitting Multiple Sclerosis

NCT01462318
View directory record Official record
Conditions
Relapsing-Remitting Multiple Sclerosis
Interventions
Midazolam, Caffeine, S-warfarin, Vitamin K, Omeprazole, Dextromethorphan, BIIB019 (Daclizumab)
Drug · Other · Biological
Lead sponsor
Biogen
Industry
Eligibility
18 Years to 65 Years
Enrollment
133 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2011 – 2016
U.S. locations
7
States / cities
Centennial, Colorado • Washington D.C., District of Columbia • Lake Barrington, Illinois + 4 more
Source: ClinicalTrials.gov public record
Updated Mar 13, 2017 · Synced Sep 2, 2026, 5:32 AM EDT
Terminated Not applicable Interventional

A Pilot Study of Dextromethorphan for the Prevention and Treatment of Methotrexate Neurotoxicity

NCT00176553
View directory record Official record
Conditions
Neurotoxicity Syndromes
Interventions
Dextromethorphan
Drug
Lead sponsor
University of Medicine and Dentistry of New Jersey
Other
Eligibility
2 Years to 21 Years
Enrollment
20 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2003 – 2007
U.S. locations
1
States / cities
New Brunswick, New Jersey
Source: ClinicalTrials.gov public record
Updated Dec 10, 2009 · Synced Sep 2, 2026, 5:32 AM EDT
Completed Phase 1 Interventional Accepts healthy volunteers Results available

A Study of Imlunestrant (LY3484356) in Female Healthy Participants

NCT05444556
View directory record Official record
Conditions
Healthy
Interventions
Imlunestrant, Repaglinide, Omeprazole, Dextromethorphan, Quinidine, Rosuvastatin, Digoxin
Drug
Lead sponsor
Eli Lilly and Company
Industry
Eligibility
18 Years to 65 Years · Female only
Enrollment
113 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2022
U.S. locations
3
States / cities
Cypress, California • South Miami, Florida • San Antonio, Texas
Source: ClinicalTrials.gov public record
Updated Dec 11, 2025 · Synced Sep 2, 2026, 5:32 AM EDT
Completed Phase 1 Interventional Accepts healthy volunteers Results available

Study of SHP620 (Maribavir) in Healthy Adults

NCT02775240
View directory record Official record
Conditions
Cytomegalovirus (CMV)
Interventions
Digoxin, Maribavir, Dextromethorphan
Drug
Lead sponsor
Shire
Industry
Eligibility
18 Years to 50 Years
Enrollment
18 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2016
U.S. locations
1
States / cities
Miami, Florida
Source: ClinicalTrials.gov public record
Updated Jun 2, 2021 · Synced Sep 2, 2026, 5:32 AM EDT
Terminated Not applicable Interventional

Dextromethorphan in Treating Patients With Fatigue Caused by Cancer

NCT00176540
View directory record Official record
Conditions
Fatigue, Unspecified Adult Solid Tumor, Protocol Specific, Unspecified Childhood Solid Tumor, Protocol Specific
Interventions
dextromethorphan hydrobromide
Drug
Lead sponsor
University of Medicine and Dentistry of New Jersey
Other
Eligibility
12 Years to 75 Years
Enrollment
30 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2003 – 2007
U.S. locations
2
States / cities
Hamilton, New Jersey • New Brunswick, New Jersey
Source: ClinicalTrials.gov public record
Updated May 16, 2011 · Synced Sep 2, 2026, 5:32 AM EDT