- ICH GCP
- US Clinical Trials Registry
- Clinical Trial NCT04899687
Study of Dextromethorphan in OCD and Related Disorders
Fluoxetine/Dextromethorphan in Obsessive-Compulsive and Related Disorders: an Open-Label Crossover Pilot Study
Study Overview
Status
Conditions
Intervention / Treatment
Detailed Description
Obsessive compulsive disorder (OCD) and the related disorders body dysmorphic disorder (BDD), somatic symptom disorder (SSD) and illness anxiety disorder (IAD) are psychiatric conditions characterized by recurrent, intrusive thoughts, feelings or images (obsessions or preoccupations) and repetitive or ritualized behaviors or avoidance performed to relieve obsession or preoccupation-related anxiety. They are a significant cause of mental health-related disability, and are inadequately served by available treatments.
This study tests whether an over-the-counter cough suppressant medicine, dextromethorphan, may offer symptom relief when combined with a low dose of fluoxetine, a standard prescription treatment for OCD and related disorders.
Study Type
Enrollment (Anticipated)
Phase
- Phase 2
Contacts and Locations
Study Contact
- Name: Pavithra Mukunda, MS
- Phone Number: 650 497 2578
- Email: ocdresearch@stanford.edu
Study Locations
-
-
California
-
Stanford, California, United States, 94304
- Recruiting
- Stanford University
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-
Participation Criteria
Eligibility Criteria
Ages Eligible for Study
Accepts Healthy Volunteers
Description
Inclusion Criteria:
- Diagnosis of obsessive-compulsive disorder (OCD), body dysmorphic disorder (BDD), illness anxiety disorder (IAD) or somatic symptom disorder (SSD)
- Living within California
- Capacity to provide informed consent
Exclusion Criteria:
- Current bipolar disorder or psychotic disorder
- Active moderate or severe substance use disorder, lifetime severe substance use disorder
- Pregnant or nursing women
- Use of prescribed psychotropic medications other than fluoxetine for 2 weeks prior to study start
- Having commenced OCD-targeted exposure and response-prevention (ExRP) psychotherapy within 2 months of study start
Study Plan
How is the study designed?
Design Details
- Primary Purpose: Treatment
- Allocation: Randomized
- Interventional Model: Crossover Assignment
- Masking: Single
Arms and Interventions
Participant Group / Arm |
Intervention / Treatment |
---|---|
Experimental: Group A: fluoxetine then fluoxetine plus dextromethorphan
Group A participants will take fluoxetine 20mg (or prior dose) daily for 4 weeks, and will then continue fluoxetine while adding over the counter dextromethorphan, with doses increasing weekly as tolerated, for 4 weeks.
|
Fluoxetine 20mg (or previously prescribed dose) will be taken once daily by mouth for 8 weeks
Other Names:
Dextromethorphan, an over-the-counter cough suppressant, will be taken by mouth twice daily for four weeks of the study, starting at 15mg per dose, and increasing weekly as tolerated to a maximum of 60mg per dose.
|
Experimental: Group B: fluoxetine plus dextromethorphan then fluoxetine
Group B participants will take fluoxetine 20mg (or prior dose) daily together with over the counter dextromethorphan, with doses increasing weekly as tolerated, for 4 weeks, and then will stop dextromethorphan, continuing fluoxetine alone for 4 weeks.
|
Fluoxetine 20mg (or previously prescribed dose) will be taken once daily by mouth for 8 weeks
Other Names:
Dextromethorphan, an over-the-counter cough suppressant, will be taken by mouth twice daily for four weeks of the study, starting at 15mg per dose, and increasing weekly as tolerated to a maximum of 60mg per dose.
|
What is the study measuring?
Primary Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
---|---|---|
Improvement in OCD or related disorder symptoms as measured by the Y-BOCS
Time Frame: Change from baseline will be assessed at 4 weeks and at 8 weeks.
|
Improvement in OCD severity is measured by the Yale-Brown Obsessive Compulsive Scale (Y-BOCS), a gold standard measure of the severity of obsessions and compulsions.
Variants of the Y-BOCS designed for assessment of body dysmorphic disorder or illness anxiety disorder/somatic symptom disorder will be used as appropriate.
Y-BOCS scores range from 0 to 40, with higher scores indicating greater severity of symptoms.
Response will be defined as a 35% reduction in Y-BOCS score.
|
Change from baseline will be assessed at 4 weeks and at 8 weeks.
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Secondary Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
---|---|---|
Improvement in clinical insight as measured by the BABS
Time Frame: Change from baseline will be assessed at 4 weeks and at 8 weeks.
|
Improvement in clinical insight is measured by the Brown Assessment of Beliefs Scale (BABS), a scale assessing multiple dimensions of clinical insight as relevant to OCD and related disorders.
The BABS rates multiple dimensions of clinical insight related to an identified belief.
BABS scores range from 0-24, with higher scores indicating greater insight impairment.
Response will be defined as a 35% reduction in BABS score.
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Change from baseline will be assessed at 4 weeks and at 8 weeks.
|
Collaborators and Investigators
Sponsor
Collaborators
Investigators
- Principal Investigator: Peter J van Roessel, MD PhD, Stanford University
Study record dates
Study Major Dates
Study Start (Actual)
Primary Completion (Anticipated)
Study Completion (Anticipated)
Study Registration Dates
First Submitted
First Submitted That Met QC Criteria
First Posted (Actual)
Study Record Updates
Last Update Posted (Actual)
Last Update Submitted That Met QC Criteria
Last Verified
More Information
Terms related to this study
Keywords
Additional Relevant MeSH Terms
- Mental Disorders
- Pathologic Processes
- Somatoform Disorders
- Disease
- Obsessive-Compulsive Disorder
- Anxiety Disorders
- Medically Unexplained Symptoms
- Body Dysmorphic Disorders
- Physiological Effects of Drugs
- Neurotransmitter Agents
- Molecular Mechanisms of Pharmacological Action
- Enzyme Inhibitors
- Excitatory Amino Acid Antagonists
- Excitatory Amino Acid Agents
- Psychotropic Drugs
- Serotonin Uptake Inhibitors
- Neurotransmitter Uptake Inhibitors
- Membrane Transport Modulators
- Serotonin Agents
- Antidepressive Agents
- Cytochrome P-450 Enzyme Inhibitors
- Antidepressive Agents, Second-Generation
- Cytochrome P-450 CYP2D6 Inhibitors
- Respiratory System Agents
- Antitussive Agents
- Dextromethorphan
- Fluoxetine
Other Study ID Numbers
- 60569
Plan for Individual participant data (IPD)
Plan to Share Individual Participant Data (IPD)?
Drug and device information, study documents
Studies a U.S. FDA-regulated drug product
Studies a U.S. FDA-regulated device product
product manufactured in and exported from the U.S.
This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.
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