A Study to Test the Effects of Centanafadine in Adults With Attention-deficit/Hyperactivity Disorder and Emotional Dysregulation

August 6, 2026 updated by: Otsuka Pharmaceutical Development & Commercialization, Inc.

A Phase 3b, Multicenter, Open-label, Single-arm Trial to Evaluate the Efficacy and Safety of Orally Administered Centanafadine QD XR Capsules in Adults With Attention-deficit/Hyperactivity Disorder and Emotional Dysregulation

The primary purpose of this study is to evaluate the efficacy of centanafadine once daily (QD) extended-release (XR) capsules in adults with attention-deficit/hyperactivity disorder (ADHD) and emotional dysregulation (ED).

Study Overview

Status

Status

Indicates the current recruitment status or the expanded access status.
Not yet recruiting

Conditions

Conditions

The disease, disorder, syndrome, illness, or injury that is being studied. On ClinicalTrials.gov, conditions may also include other health-related issues, such as lifespan, quality of life, and health risks.

Intervention / Treatment

Intervention / Treatment

A process or action that is the focus of a clinical study. Interventions include drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available. Interventions can also include noninvasive approaches, such as education or modifying diet and exercise.

Study Type

Study Type

Describes the nature of a clinical study. Study types include interventional studies (also called clinical trials), observational studies (including patient registries), and expanded access.
Interventional

Enrollment (Estimated)

Enrollment

The number of participants in a clinical study. The "anticipated" enrollment is the target number of participants that the researchers need for the study.
80

Phase

Phase

The stage of a clinical trial studying a drug or biological product, based on definitions developed by the U.S. Food and Drug Administration (FDA). The phase is based on the study's objective, the number of participants, and other characteristics. There are five phases: Early Phase 1 (formerly listed as Phase 0), Phase 1, Phase 2, Phase 3, and Phase 4. Not Applicable is used to describe trials without FDA-defined phases, including trials of devices or behavioral interventions.
  • Phase 3

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Contact

Study Contact

The name and contact information for the person who can answer enrollment questions for a clinical study. Each location where the study is being conducted may also have a specific contact, who may be better able to answer those questions.

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Eligibility Criteria

The key requirements that people who want to participate in a clinical study must meet or the characteristics they must have. Eligibility criteria consist of both inclusion criteria (which are required for a person to participate in the study) and exclusion criteria (which prevent a person from participating). Types of eligibility criteria include whether a study accepts healthy volunteers, has age or age group requirements, or is limited by sex.

Ages Eligible for Study

  • Adult
  • Older Adult

Accepts Healthy Volunteers

No

Description

Inclusion Criteria

  1. Primary diagnosis of ADHD per the Adult ADHD Clinical Diagnostic Scale (ACDS).
  2. Adult ADHD Investigator Symptom Rating Scale (AISRS) total score of ≥ 28 at baseline.
  3. Symptoms of ED as determined by the WRAADDS-ED subscale score ≥ 7 at baseline.
  4. CGI-S-ADHD rating ≥ 4 (at least moderate severity) at baseline.

Exclusion Criteria

  1. Diagnostic and Statistical Manual of Mental Disorders, Fifth Edition (DSM-5) criteria for a lifetime diagnosis of bipolar and related disorders, schizophrenia spectrum and other psychotic disorders, borderline and antisocial personality disorders, neurocognitive disorders, autism spectrum disorder, or intellectual disability.
  2. DSM-5 criteria for a current diagnosis of major depressive disorder, post-traumatic stress disorder, any substance use disorder, untreated/unstable obstructive sleep apnea, eating disorders, or obsessive compulsive disorder.
  3. Any other current DSM-5 comorbid psychiatric disorder identified by the Mini International Neuropsychiatric Interview (MINI) or any medical condition that, in the judgment of the investigator, could be expected to require treatment with medications prohibited in this trial that cannot be safely discontinued with completion of an appropriate washout, could confound efficacy or safety assessments, or be the primary driver of ED.
  4. Presence of an unstable or uncontrolled medical condition that, in the opinion of the investigator, could pose a safety risk to the participant or could manifest with psychiatric symptoms (eg, thyroid disease).
  5. In the clinical opinion of the investigator, the participant has not derived significant therapeutic benefit from 2 or more ADHD therapies of 2 different classes (eg, amphetamine and methylphenidate, or amphetamine and atomoxetine) given with an acceptable dose and duration during adulthood (aged 18 years or older).
  6. Current use of prohibited psychotropic medications that cannot be discontinued within 7 to 28 days prior to enrollment.
  7. Any disorder that is the primary focus of treatment other than ADHD.
  8. Evidence of current substance use disorder or history in the past 12 months.
  9. History of any prior exposure to centanafadine.
  10. Participated in other clinical trials involving investigational drugs within 180 days prior to screening or participated in more than 2 interventional clinical trials involving investigational drugs within the past year.
  11. Have an allergy to the IMP or any component of the IMP.

Note: Other protocol-specified inclusion/exclusion criteria may apply.

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Primary Purpose: Treatment
  • Allocation: N/A
  • Interventional Model: Single Group Assignment
  • Masking: None (Open Label)

Arms and Interventions

Participant Group / Arm

Participant Group / Arm

A group or subgroup of participants in a clinical trial that receives a specific intervention/treatment, or no intervention, according to the trial's protocol.
Intervention / Treatment

Intervention / Treatment

A process or action that is the focus of a clinical study. Interventions include drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available. Interventions can also include noninvasive approaches, such as education or modifying diet and exercise.
Experimental: Centanafadine XR
Participants will receive centanafadine XR capsule 328.8 milligrams (mg), orally, QD, for 8 weeks.
Drug: Centanafadine XR
Oral capsules
Other Names:
  • EB-1020

What is the study measuring?

Primary Outcome Measures

Primary Outcome Measures

In a clinical study's protocol, the planned outcome measure that is the most important for evaluating the effect of an intervention/treatment. Most clinical studies have one primary outcome measure, but some have more than one.
Outcome Measure
Time Frame
Change From Baseline to Week 8 in the Wender-Reimherr Adult Attention Deficit Disorder Scale (WRAADDS) Total Score
Time Frame: Baseline up to Week 8
Baseline up to Week 8

Secondary Outcome Measures

Secondary Outcome Measures

In a clinical study's protocol, a planned outcome measure that is not as important as the primary outcome measure for evaluating the effect of an intervention but is still of interest. Most clinical studies have more than one secondary outcome measure.
Outcome Measure
Time Frame
Change From Baseline to Week 8 in the Wender-Reimherr Adult Attention Deficit Disorder Scale Emotional Dysregulation (WRAADDS-ED) Subscale Score
Time Frame: Baseline up to Week 8
Baseline up to Week 8
Change From Baseline to Week 8 in the Clinical Global Impressions-Severity Scale for Attention-Deficit/Hyperactivity Disorder (CGI-S-ADHD) Score
Time Frame: Baseline up to Week 8
Baseline up to Week 8
Change From Baseline to Week 8 in the Behavior Rating Inventory of Executive Function-Adult Version (BRIEF-A) T-score for the Global Executive Composite (GEC) Scale
Time Frame: Baseline up to Week 8
Baseline up to Week 8
Change From Baseline to Week 8 in the BRIEF-A T-score for the Behavioral Regulation Index (BRI) Scale
Time Frame: Baseline up to Week 8
Baseline up to Week 8
Change From Baseline to Week 8 in the BRIEF-A T-score for the Metacognition Index (MI) Scale
Time Frame: Baseline up to Week 8
Baseline up to Week 8
Change From Baseline to Week 8 in the Difficulties in Emotion Regulation Scale (DERS) Total Score
Time Frame: Baseline up to Week 8
Baseline up to Week 8
Change From Baseline to Week 8 in the Nonacceptance of Emotional Responses (NONACCEPT) DERS Subscale Score
Time Frame: Baseline up to Week 8
Baseline up to Week 8
Change From Baseline to Week 8 in the Difficulties Engaging in Goal-Directed Behavior (GOALS) DERS Subscale Score
Time Frame: Baseline up to Week 8
Baseline up to Week 8
Change From Baseline to Week 8 in the Impulse Control Difficulties (IMPULSE) DERS Subscale Score
Time Frame: Baseline up to Week 8
Baseline up to Week 8
Change From Baseline to Week 8 in the Lack of Emotional Awareness (AWARE) DERS Subscale Score
Time Frame: Baseline up to Week 8
Baseline up to Week 8
Change From Baseline to Week 8 in the Limited Access to Emotion Regulation Strategies (STRATEGIES) DERS Subscale Score
Time Frame: Baseline up to Week 8
Baseline up to Week 8
Change From Baseline to Week 8 in the Lack of Emotional Clarity (CLARITY) DERS Subscale Score
Time Frame: Baseline up to Week 8
Baseline up to Week 8
Change From Baseline to Week 8 in the Attention-Deficit/Hyperactivity Disorder Symptoms, Executive Function Deficits, and Emotional Dyscontrol as Assessed by the Adult ADHD Self-Report Scale (ASRS) Score
Time Frame: Baseline up to Week 8
Baseline up to Week 8
Number of Participants With Adverse Events
Time Frame: Up to Week 9
Up to Week 9
Number of Participants With Suicidal Ideation or Behavior as Assessed by the Columbia-Suicide Severity Rating Scale (C-SSRS)
Time Frame: Up to Week 9
Up to Week 9

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Sponsor

The organization or person who initiates the study and who has authority and control over the study.
Otsuka Pharmaceutical Development & Commercialization, Inc.

Publications and helpful links

The person responsible for entering information about the study voluntarily provides these publications. These may be about anything related to the study.

Helpful Links

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start (Estimated)

Study Start

The actual date on which the first participant was enrolled in a clinical study. The "anticipated" study start date is the date that the researchers think will be the study start date.
August 20, 2026

Primary Completion (Estimated)

Primary Completion

The date on which the last participant in a clinical study was examined or received an intervention to collect final data for the primary outcome measure. Whether the clinical study ended according to the protocol or was terminated does not affect this date. For clinical studies with more than one primary outcome measure with different completion dates, this term refers to the date on which data collection is completed for all the primary outcome measures. The "anticipated" primary completion date is the date that the researchers think will be the primary completion date for the study.
May 27, 2027

Study Completion (Estimated)

Study Completion

The date on which the last participant in a clinical study was examined or received an intervention/treatment to collect final data for the primary outcome measures, secondary outcome measures, and adverse events (that is, the last participant's last visit). The "anticipated" study completion date is the date that the researchers think will be the study completion date.
May 27, 2027

Study Registration Dates

First Submitted

First Submitted

The date on which the study sponsor or investigator first submitted a study record to ClinicalTrials.gov. There is typically a delay of a few days between the first submitted date and the record's availability on ClinicalTrials.gov (the first posted date).
August 6, 2026

First Submitted That Met QC Criteria

First Submitted That Met QC Criteria

The date on which the study sponsor or investigator first submits a study record that is consistent with National Library of Medicine (NLM) quality control (QC) review criteria. The sponsor or investigator may need to revise and submit a study record one or more times before NLM's QC review criteria are met. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
August 6, 2026

First Posted (Actual)

First Posted

The date on which the study record was first available on ClinicalTrials.gov after National Library of Medicine (NLM) quality control (QC) review has concluded. There is typically a delay of a few days between the date the study sponsor or investigator submitted the study record and the first posted date.
August 12, 2026

Study Record Updates

Last Update Posted (Actual)

Last Update Posted

The most recent date on which changes to a study record were made available on ClinicalTrials.gov. There may be a delay between when the changes were submitted to ClinicalTrials.gov by the study's sponsor or investigator (the last update submitted date) and the last update posted date.
August 12, 2026

Last Update Submitted That Met QC Criteria

Last Update Submitted That Met QC Criteria

The most recent date on which the study sponsor or investigator submitted changes to a study record that are consistent with National Library of Medicine (NLM) quality control (QC) review criteria. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
August 6, 2026

Last Verified

Last Verified

The most recent date on which the study sponsor or investigator confirmed the information about a clinical study on ClinicalTrials.gov as accurate and current. If a study with a recruitment status of recruiting; not yet recruiting; or active, not recruiting has not been confirmed within the past 2 years, the study's recruitment status is shown as unknown.
August 1, 2026

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

Other Study ID Numbers

Identifiers or ID numbers other than the NCT number that are assigned to a clinical study by the study's sponsor, funders, or others. These numbers may include unique identifiers from other trial registries and National Institutes of Health grant numbers.
  • 405-201-00231

Plan for Individual participant data (IPD)

Plan to Share Individual Participant Data (IPD)?

YES

IPD Plan Description

Anonymized individual participant data (IPD) that underlie the results of this study will be shared with researchers to achieve aims pre-specified in a methodologically sound research proposal. Small studies with less than 25 participants are excluded from data sharing.

IPD Sharing Time Frame

Data will be available after marketing approval in global markets, or beginning 1-3 years following article publication. There is no end date to the availability of the data.

IPD Sharing Access Criteria

Otsuka will share data on the Vivli data sharing platform: https://vivli.org/ourmember/Otsuka/

IPD Sharing Supporting Information Type

  • STUDY_PROTOCOL
  • SAP
  • ICF

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

Yes

Studies a U.S. FDA-regulated device product

No

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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