A Trial to Evaluate the Efficacy, Safety, and Tolerability of Centanafadine Sustained-release Tablets in Adults With Attention-deficit/Hyperactivity Disorder

Study Overview
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Brief Summary
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This study evaluated the efficacy, safety, and tolerability of centanafadine sustained-release tablets in adults with ADHD. Participants either received a twice-daily dose of centanafadine sustained-release tablets, or twice-daily placebo.

Detailed Description
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Screening & Washout Period: up to 28 days Investigational Treatment Period: 49 days Follow-up Period : 7 days or 10 days

Official Title
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A Phase 3, Randomized, Double-blind, Multicenter, Placebo-controlled, Parallel-group Trial Evaluating the Efficacy, Safety, and Tolerability of Centanafadine Sustained-release Tablets in Adults With Attention-deficit/Hyperactivity Disorder

Conditions
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Attention Deficit Disorder, Attention Deficit Hyperactivity Disorder

Intervention / Treatment
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* Drug: Centanafadine SR
* Other: Placebo
* Drug: Centanafadine SR


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Participants must meet the Diagnostic and Statistical Manual of Mental Disorders Fifth Edition (DSM-5) criteria for ADHD (including predominantly inattentive presentation, hyperactive presentation, or combined presentation) as confirmed by the Adult ADHD Clinical Diagnostic Scale (ACDS) Version 1.2. To confirm that ADHD is the primary diagnosis, the Mini International Neuropsychiatric Interview (MINI) will be used to identify and exclude other psychiatric conditions which would preclude enrollment. Participants who were not receiving any pharmacological treatment for ADHD must have an Adult ADHD Investigator Symptom Rating Scale (AISRS) score of ≥ 28 at screening and baseline. Participants who were receiving pharmacological treatment for ADHD at screening must have a minimum AISRS score of ≥ 22 at screening, and a score of ≥ 28 at baseline. All participants must be willing to discontinue all prohibited psychotropic medications starting from the time of signing the informed consent through the 7-day follow-up period. Participants that do not rollover into Trial 405-201-00015 must be willing to discontinue all prohibited psychotropic medications starting from the time of signing the informed consent until after the follow-up telephone call 10 days after the last dose of IMP. Participants must have a Clinical Global Impression-Severity of Illness Scale (CGI-S) score of ≥ 4 (≥ moderate impairment) at baseline. Exclusion Criteria: Participant has a DSM-5 Diagnosis of Other Specified or Unspecified Attention Deficit/Hyperactivity Disorder. Participant has a current comorbid psychiatric disorder that either could be expected to require treatment with medications prohibited in this trial, or to confound efficacy or safety assessments. Examples include, but are not limited to, psychotic disorder, bipolar disorder, generalized anxiety disorder, obsessive-compulsive disorder, panic disorder, a current major depressive episode, or posttraumatic stress disorder, as established by the MINI. In the opinion of the investigator, participants has not derived significant therapeutic benefit from 2 or more ADHD therapies of 2 different classes (eg, amphetamine and methylphenidate) given with an acceptable dose and duration of adulthood (aged 18 or older). NOTE: If participants has not derived significant therapeutic benefit due to an inability to tolerate side effects, eligibility can be discussed on case-by-case basis with the medical monitor. Participants who have a positive alcohol test (via breathalyzer or blood), a positive drug screen assessed prior to the baseline visit for cocaine, other illicit drugs (including marijuana), or prescription or OTC ADHD medications will be early terminated. This includes medications such as opioids or benzodiazepines taken without prescription. In the opinion of the investigator, the participants is unable to adhere to the treatment regimen or other requirements outlined in the protocol.

Ages Eligible for Study
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Minimum Age: 18 Years
Maximum Age: 55 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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No

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Treatment
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Double


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: Single-blind Run-in Period: Placebo<br>Placebo-matching tablets BID (twice daily) on Day -7 through Baseline (Day -1). | Other: Placebo<br>* BID, oral tablet<br>|
| Experimental: Double-blind Treatment Period: Centanafadine SR 200 mg<br>Following Single-blind Run-in Period, participants with <30% improvement on Adult ADHD Self Report Scale (ASRS) scale score were randomized to receive centanafadine 200 mg SR tablets BID orally on Day 1 through Day 42 in the Double-blind Treatment Period. | Drug: Centanafadine SR<br>* 100 mg, BID, oral tablets<br>* Other names: EB-1020;|
| Experimental: Double-blind Treatment Period: Centanafadine SR 400 mg<br>Following Single-blind Run-in Period, participants with <30% improvement on Adult ADHD Self Report Scale (ASRS) scale score were randomized to receive centanafadine 400 mg SR tablets BID orally on Day 1 through Day 42 in the Double-blind Treatment Period. | Drug: Centanafadine SR<br>* 200 mg, BID, oral tablets<br>* Other names: EB-1020;|
| Placebo Comparator: Double-blind Treatment Period: Placebo<br>Following Single-blind Run-in Period, participants with <30% improvement on Adult ADHD Self Report Scale (ASRS) scale score were randomized to receive centanafadine SR matching placebo tablets BID orally on Day 1 through Day 42 in the Double-blind Treatment Period. | Other: Placebo<br>* BID, oral tablet<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Change From Baseline in ADHD Investigator Symptom Rating Scale (AISRS) Score at Day 42 | The AISRS is an 18-item clinician rating scale to evaluate individual ADHD symptoms on a scale of 0 (none) to 3 (severe). The total sum ranges from 0 (no ADHD symptoms) to 54 (extremely severe ADHD symptoms). Mixed-effect model repeated measure (MMRM) was used for the analysis. | Baseline and Day 42 | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Change From Baseline in Clinical Global Impression-Severity of Illness Scale (CGI-S) Score at Day 42 | CGI-S is an observer-rated scale used to measure symptom severity with a total score range of 0 to 7 where 1 = normal, not at all ill; 2 = borderline mentally ill; 3 = mildly ill; 4 = moderately ill; 5 = markedly ill; 6 = severely ill; and 7 = among the most extremely ill participants. A negative change from Baseline indicates improvement. MMRM was used for the analysis. | Baseline and Day 42 | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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Centanafadine, ADD, ADHD