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Showing 25–48 of 24 matching trials from the live ClinicalTrials.gov search.
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Filters: Intervention: Dextromethorphan hydrobromide Clear all
Terminated Phase 1 Interventional Accepts healthy volunteers

Drug-Drug Interaction Study to Evaluate the Effects of Ecopipam on the Pharmacokinetics of Multiple Substrates

NCT04764851
View directory record Official record
Conditions
Drug-Interactions
Interventions
ecopipam HCl ~2mg/kg/day, Cohort 1 Probe Cocktail, Cohort 2 Probe Cocktail, Cohort 3 Probe Cocktail
Drug · Combination Product
Lead sponsor
Emalex Biosciences Inc.
Industry
Eligibility
18 Years to 55 Years
Enrollment
30 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021
U.S. locations
1
States / cities
Miami, Florida
Source: ClinicalTrials.gov public record
Updated May 23, 2021 · Synced Sep 23, 2026, 8:16 PM EDT
Completed Phase 4 Interventional Results available

Treatment of Acute Sinusitis

NCT00377403
View directory record Official record
Conditions
Acute Respiratory Infections, Acute Rhinosinusitis
Interventions
Acetaminophen, Amoxicillin, Dextromethorphan hydrobromide with guaifenesin, Guaifenesin, Pseudoephedrine Sustained Action, Saline spray (0.65%)
Drug
Lead sponsor
Washington University School of Medicine
Other
Eligibility
18 Years to 70 Years
Enrollment
172 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2006 – 2010
U.S. locations
1
States / cities
St Louis, Missouri
Source: ClinicalTrials.gov public record
Updated Dec 27, 2012 · Synced Sep 23, 2026, 8:16 PM EDT
Withdrawn Phase 4 Interventional Accepts healthy volunteers

Phase 4, Vedolizumab-4002 Post-marketing, Disease-Drug-Drug Interaction Study

NCT02760615
View directory record Official record
Conditions
Colitis, Ulcerative, Crohn Disease
Interventions
Caffeine, Losartan, Omeprazole, Dextromethorphan, Midazolam, Vedolizumab
Drug
Lead sponsor
Takeda
Industry
Eligibility
18 Years to 55 Years
Healthy volunteers
Accepts healthy volunteers
Timeline
2016 – 2020
U.S. locations
2
States / cities
Cypress, California • Miami, Florida
Source: ClinicalTrials.gov public record
Updated Oct 26, 2020 · Synced Sep 23, 2026, 8:16 PM 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 23, 2026, 8:16 PM 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 12, 2026 · Synced Sep 23, 2026, 8:16 PM EDT
Completed Phase 1 Interventional Results available

A Pharmacokinetic Study of RO5185426 in Combination With a Drug Cocktail in Patients With Metastatic Melanoma

NCT01001299
View directory record Official record
Conditions
Malignant Melanoma
Interventions
Drug cocktail, RO5185426
Drug
Lead sponsor
Hoffmann-La Roche
Industry
Eligibility
18 Years and older
Enrollment
25 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009 – 2012
U.S. locations
5
States / cities
Los Angeles, California • Boston, Massachusetts • Nashville, Tennessee + 1 more
Source: ClinicalTrials.gov public record
Updated Aug 14, 2017 · Synced Sep 23, 2026, 8:16 PM EDT
Completed Phase 2 Interventional Results available

Dextromethorphan in Fibromyalgia

NCT03538054
View directory record Official record
Conditions
Fibromyalgia
Interventions
Dextromethorphan, Placebo
Drug
Lead sponsor
University of Alabama at Birmingham
Other
Eligibility
23 Years to 65 Years · Female only
Enrollment
27 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018 – 2020
U.S. locations
1
States / cities
Birmingham, Alabama
Source: ClinicalTrials.gov public record
Updated Aug 25, 2022 · Synced Sep 23, 2026, 8:16 PM EDT
Completed Phase 2 Interventional

Dextromethorphan for the Treatment of Parkinson's Disease and Similar Conditions of the Nervous System

NCT00001365
View directory record Official record
Conditions
Neurodegenerative Disease, Parkinson's Disease
Interventions
dextromethorphan
Drug
Lead sponsor
National Institute of Neurological Disorders and Stroke (NINDS)
NIH
Eligibility
Not listed
Enrollment
42 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
1993 – 2001
U.S. locations
1
States / cities
Bethesda, Maryland
Source: ClinicalTrials.gov public record
Updated Jul 12, 2006 · Synced Sep 23, 2026, 8:16 PM EDT
Terminated Phase 3 Interventional Results available

An Open-Label Study to Assess the Long-term Safety of AXS-05 in Subjects With Dementia of the Alzheimer's Type, ADVANCE-2 and ACCORD-2 Extension Study

NCT06736509
View directory record Official record
Conditions
Agitation in Patients With Dementia of the Alzheimer's Type, Alzheimer Disease, Agitation, Psychomotor
Interventions
AXS-05 (dextromethorphan-bupropion)
Drug
Lead sponsor
Axsome Therapeutics, Inc.
Industry
Eligibility
65 Years to 90 Years
Enrollment
139 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2024 – 2025
U.S. locations
21
States / cities
Peoria, Arizona • Walnut Creek, California • Bonita Springs, Florida + 13 more
Source: ClinicalTrials.gov public record
Updated Jun 24, 2026 · Synced Sep 23, 2026, 8:16 PM EDT
Terminated No phase listed Observational Results available

Breath Test for Women Receiving Tamoxifen in the Prevention or Treatment of Breast Cancer

NCT00873366
View directory record Official record
Conditions
Breast Cancer
Interventions
dextromethorphan hydrobromide, tamoxifen citrate, high performance liquid chromatography, laboratory biomarker analysis, pharmacogenomic studies, pharmacological study, fluorescence imaging
Drug · Other · Procedure
Lead sponsor
Mayo Clinic
Other
Eligibility
18 Years to 120 Years · Female only
Enrollment
92 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009 – 2015
U.S. locations
2
States / cities
Scottsdale, Arizona • Rochester, Minnesota
Source: ClinicalTrials.gov public record
Updated Jan 22, 2018 · Synced Sep 23, 2026, 8:16 PM 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 5, 2020 · Synced Sep 23, 2026, 8:16 PM EDT
Terminated Phase 2 Interventional Results available

Safety, Tolerability and Efficacy of AVP-786 for the Treatment of Disinhibition

NCT02534038
View directory record Official record
Conditions
Disinhibition Syndrome
Interventions
AVP-786, Placebo
Drug
Lead sponsor
Otsuka Pharmaceutical Development & Commercialization, Inc.
Industry
Eligibility
50 Years to 90 Years
Enrollment
1 participant
Healthy volunteers
Healthy volunteers not accepted
Timeline
2015 – 2017
U.S. locations
1
States / cities
Las Vegas, Nevada
Source: ClinicalTrials.gov public record
Updated May 12, 2026 · Synced Sep 23, 2026, 8:16 PM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

Drug-Drug Interaction Study to Evaluate the Effects of Ecopipam on the Pharmacokinetics of Multiple Substrates for Drug Metabolism and Transport

NCT05334108
View directory record Official record
Conditions
Drug Interaction
Interventions
Ecopipam, Cohort 1 Probe Substrate Cocktail, Cohort 2 Probe Substrate, Cohort 3 Probe Substrate Cocktail
Drug · Combination Product
Lead sponsor
Emalex Biosciences Inc.
Industry
Eligibility
18 Years to 55 Years
Enrollment
56 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2022
U.S. locations
1
States / cities
San Antonio, Texas
Source: ClinicalTrials.gov public record
Updated Dec 11, 2022 · Synced Sep 23, 2026, 8:16 PM EDT
Completed Phase 2 Interventional Results available

Placebo Controlled Trial of Dextromethorphan in Rett Syndrome

NCT01520363
View directory record Official record
Conditions
Rett Syndrome
Interventions
dextromethorphan, placebo
Drug
Lead sponsor
Hugo W. Moser Research Institute at Kennedy Krieger, Inc.
Other
Eligibility
1 Year to 10 Years
Enrollment
57 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2012 – 2016
U.S. locations
1
States / cities
Baltimore, Maryland
Source: ClinicalTrials.gov public record
Updated Dec 3, 2018 · Synced Sep 23, 2026, 8:16 PM 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 23, 2026, 8:16 PM EDT
Completed Phase 3 Interventional Results available

Efficacy, Safety, and Tolerability of AVP-786 for the Treatment of Agitation in Participants With Dementia of the Alzheimer's Type

NCT02442778
View directory record Official record
Conditions
Agitation in Participants With Dementia of the Alzheimer's Type
Interventions
AVP-786-18, Placebo, AVP-786-28, AVP-786-42.63
Drug
Lead sponsor
Otsuka Pharmaceutical Development & Commercialization, Inc.
Industry
Eligibility
50 Years to 90 Years
Enrollment
522 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2015 – 2019
U.S. locations
79
States / cities
Chandler, Arizona • Tucson, Arizona • Fayetteville, Arkansas + 55 more
Source: ClinicalTrials.gov public record
Updated Sep 8, 2022 · Synced Sep 23, 2026, 8:16 PM 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 13, 2016 · Synced Sep 23, 2026, 8:16 PM EDT
Completed Phase 1 Interventional

A Study To Test The Effect Of GW786034 (Pazopanib) On P450 Enzymes

NCT00401583
View directory record Official record
Conditions
Carcinoma, Renal Cell
Interventions
GW786034 (pazopanib), Probe drugs
Drug
Lead sponsor
GlaxoSmithKline
Industry
Eligibility
21 Years and older
Enrollment
24 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2006 – 2008
U.S. locations
1
States / cities
Lebanon, New Hampshire
Source: ClinicalTrials.gov public record
Updated Nov 12, 2017 · Synced Sep 23, 2026, 8:16 PM EDT
Completed Phase 1 Interventional Results available

Study of Cobimetinib in Participants With Solid Tumors

NCT00467779
View directory record Official record
Conditions
Solid Tumor
Interventions
cobimetinib, dextromethorphan, midazolam
Drug
Lead sponsor
Genentech, Inc.
Industry
Eligibility
18 Years and older
Enrollment
119 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2007 – 2014
U.S. locations
4
States / cities
Los Angeles, California • Stanford, California • Detroit, Michigan + 1 more
Source: ClinicalTrials.gov public record
Updated Aug 25, 2016 · Synced Sep 23, 2026, 8:16 PM 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 27, 2025 · Synced Sep 23, 2026, 8:16 PM EDT
Terminated Phase 1 Interventional Accepts healthy volunteers

A Study to Evaluate the Effect of Ustekinumab on Cytochrome P450 Enzyme Activities Following Induction and Maintenance Dosing in Participants With Active Crohn's Disease or Ulcerative Colitis

NCT03358706
View directory record Official record
Conditions
Crohn Disease, Ulcerative Colitis
Interventions
Ustekinumab IV Infusion, Ustekinumab SC Injection, Midazolam 2 mg, Warfarin 10 mg, Vitamin K 10 mg, Omeprazole 20 mg, Dextromethorphan 30 mg, Caffeine 100 mg
Drug
Lead sponsor
Janssen Research & Development, LLC
Industry
Eligibility
18 Years to 75 Years
Enrollment
28 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2018 – 2021
U.S. locations
3
States / cities
Cypress, California • Miami Springs, Florida • Durham, North Carolina
Source: ClinicalTrials.gov public record
Updated Aug 20, 2025 · Synced Sep 23, 2026, 8:16 PM 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 22, 2014 · Synced Sep 23, 2026, 8:16 PM EDT
Completed Phase 3 Interventional

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

NCT04947553
View directory record Official record
Conditions
Agitation in Patients With Dementia of the Alzheimer's Type, Alzheimer Disease, Agitation, Psychomotor
Interventions
AXS-05 (dextromethorphan-bupropion), Placebo
Drug
Lead sponsor
Axsome Therapeutics, Inc.
Industry
Eligibility
65 Years to 90 Years
Enrollment
456 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2024
U.S. locations
45
States / cities
Peoria, Arizona • Tempe, Arizona • Long Beach, California + 35 more
Source: ClinicalTrials.gov public record
Updated Dec 7, 2025 · Synced Sep 23, 2026, 8:16 PM EDT
Terminated Phase 4 Interventional Results available

Effectiveness, Safety, and Health-Related Outcomes of NUEDEXTA® in Nursing Home Patients With Pseudobulbar Affect (PBA)

NCT02496039
View directory record Official record
Conditions
Pseudobulbar Affect (Involuntary Laughing and/or Crying)
Interventions
NUEDEXTA®
Drug
Lead sponsor
Avanir Pharmaceuticals
Industry
Eligibility
18 Years to 90 Years
Enrollment
5 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2015 – 2016
U.S. locations
2
States / cities
Miami, Florida • Centerville, Ohio
Source: ClinicalTrials.gov public record
Updated Jul 2, 2017 · Synced Sep 23, 2026, 8:16 PM EDT