Evaluation of SPN-812 (Viloxazine Extended-release Capsule) in Adults With ADHD

The Primary Endpoint was the change from baseline in the Adult ADHD Investigator Symptom Rating Scale (AISRS) Total score at Week 6. The AISRS is an ADHD-specific rating scale designed and validated to assess current ADHD symptomatology in adults. The AISRS consists of 18 items that directly correspond to the 18 symptoms of ADHD per the Diagnostic and Statistical Manual of Mental Disorders, 5th Edition (DSM-5). The scale is subdivided into two subscales: Inattention (9 items) and Hyperactivity/Impulsivity (9 items). The clinician/investigator rates the subject on each item using a 4-point scale, where 0=none, 1=mild, 2=moderate, and 3=severe. A Total score is calculated by summating the ratings of all 18 items (range: 0-54; the higher the score, the more severe the ADHD symptoms). A lower change from baseline AISRS Total score (<0) represents a better outcome.

The Key Secondary Endpoint was the change from baseline in the Clinical Global Impression - Severity of Illness (CGI-S) score at Week 6. The CGI-S is a single item clinician-rated assessment of the severity of subject's condition (ADHD symptoms) in relation to the clinician's total experience with patients with ADHD. The CGI-S is evaluated on a 7-point scale with 1 = Normal, not at all ill, asymptomatic, 2 = Borderline Ill, 3 = Mildly Ill, 4 = Moderately Ill, 5 = Markedly Ill, 6 = Severely Ill, and 7 = Among the most extremely ill patients. Successful therapy is indicated by a lower overall score in subsequent testing. A lower change from baseline CGI-S score (<0) represents a better outcome.

An additional secondary endpoint was the percentage of subjects with a Clinical Global Impression - Severity of Illness (CGI-S) score of 1 or 2 ("responders") at Week 6. The CGI-S is a single item clinician-rated assessment of the severity of subject's condition (ADHD symptoms) in relation to the clinician's total experience with patients with ADHD. The CGI-S is evaluated on a 7-point scale with 1 = Normal, not at all ill, asymptomatic, 2 = Borderline Ill, 3 = Mildly Ill, 4 = Moderately Ill, 5 = Markedly Ill, 6 = Severely Ill, and 7 = Among the most extremely ill patients. Responder rate values range from 0 to 100%. A higher percentage represents a greater number of subjects who are "responders".

An additional secondary endpoint was the Clinical Global Impression - Improvement (CGI-I) score at Week 6. The CGI-I scale is a single item clinician-rated assessment of how much the subject's condition (ADHD) has improved, worsened or has not changed relative to his/her baseline state prior to the beginning of treatment. The CGI-I is rated on a 7-point scale from 1 to 7, where 1 = "very much improved", 2 = "much improved", 3 = "minimally improved", 4 = "no change", 5 = "minimally worse", 6 = "much worse", and 7 = "very much worse". A CGI-I score <4 represents a better outcome.

An additional secondary endpoint was the percentage of subjects with a CGI-I score of 1 or 2 ("responders") at Week 6. The CGI-I scale is a single item clinician-rated assessment of how much the subject's condition (ADHD) has improved, worsened or has not changed relative to his/her baseline state prior to the beginning of treatment. The CGI-I is rated on a 7-point scale from 1 to 7, where 1 = "very much improved", 2 = "much improved", 3 = "minimally improved", 4 = "no change", 5 = "minimally worse", 6 = "much worse", and 7 = "very much worse". Responder rate values can range from 0 to 100%. A higher percentage represents a greater number of subjects who are "responders".

An additional secondary endpoint was the change from baseline in the Generalized Anxiety Disorder 7-Item (GAD-7) Total score at Week 6. The GAD-7 is a self-reported 7-item questionnaire for screening and measuring the severity of generalized anxiety disorder. The subject rates each item on 4-point scale (0-3), where 0 = "Not at all", 1 = "Several days", 2 = "Over half the days", and 3 = "Nearly every day". The total score is calculated by summated the ratings of all 7 items. The total score can range between 0 to 21; the higher the score, the more severe the symptoms of anxiety. A lower change from baseline GAD-7 total score (<0) represents a better outcome.

An additional secondary endpoint was the change from baseline in the Adult ADHD Investigator Symptom Rating Scale (AISRS) "Inattention" subscale score at Week 6. The AISRS is an ADHD-specific rating scale designed and validated to assess current ADHD symptomatology in adults. The AISRS consists of 18 items that directly correspond to the 18 symptoms of ADHD per the Diagnostic and Statistical Manual of Mental Disorders, 5th Edition (DSM-5). The scale is subdivided into two subscales: Inattention (9 items) and Hyperactivity/Impulsivity (9 items). The clinician/investigator rates the subject on each item using a 4-point scale, where 0=none, 1=mild, 2=moderate, and 3=severe. The Inattention subscale score is calculated by summating the ratings of all 9 Inattention items (range: 0-27; the higher the score, the more severe the symptoms). A lower change from baseline Inattention subscale score (<0) represents a better outcome.

An additional secondary endpoint was the change from baseline in the Adult ADHD Investigator Symptom Rating Scale (AISRS) "Hyperactivity/Impulsivity" subscale score at Week 6. The AISRS is an ADHD-specific rating scale designed and validated to assess current ADHD symptomatology in adults. The AISRS consists of 18 items that directly correspond to the 18 symptoms of ADHD per the Diagnostic and Statistical Manual of Mental Disorders, 5th Edition (DSM-5). The scale is subdivided into two subscales: Inattention (9 items) and Hyperactivity/Impulsivity (9 items). The clinician/investigator rates the subject on each item using a 4-point scale, where 0=none, 1=mild, 2=moderate, and 3=severe. The Hyperactivity/Impulsivity subscale score is calculated by summating the ratings of all 9 Hyperactivity/Impulsivity items (range: 0-27; the higher the score, the more severe the symptoms). A lower change from baseline Hyperactivity/Impulsivity subscale score (<0) represents a better outcome.

An additional secondary endpoint was the percentage of subjects with a 30% or greater reduction in their change from baseline Adult ADHD Investigator Symptom Rating Scale (AISRS) Total score at Week 6. The AISRS is an ADHD-specific rating scale designed and validated to assess current ADHD symptomatology in adults. The AISRS consists of 18 items that directly correspond to the 18 symptoms of ADHD per the Diagnostic and Statistical Manual of Mental Disorders, 5th Edition (DSM-5). The clinician/investigator rates the subject on each item using a 4-point scale, where 0=none, 1=mild, 2=moderate, and 3=severe. A Total score is calculated by summating the ratings of all 18 items (range: 0-54; the higher the score, the more severe the symptoms). The Total score is converted to a percent change from baseline. 30% responder rate values can range between 0 and 100%. A higher percentage represents a greater number of subjects who are "responders".

An additional secondary endpoint was the percentage of subjects with a 50% or greater reduction in their change from baseline Adult ADHD Investigator Symptom Rating Scale (AISRS) Total score at Week 6. The AISRS is an ADHD-specific rating scale designed and validated to assess current ADHD symptomatology in adults. The AISRS consists of 18 items that directly correspond to the 18 symptoms of ADHD per the Diagnostic and Statistical Manual of Mental Disorders, 5th Edition (DSM-5). The clinician/investigator rates the subject on each item using a 4-point scale, where 0=none, 1=mild, 2=moderate, and 3=severe. A Total score is calculated by summating the ratings of all 18 items (range: 0-54; the higher the score, the more severe the symptoms). The Total score is converted to a percent change from baseline. 50% responder rate values can range between 0 and 100%. A higher percentage represents a greater number of subjects who are "responders".

An additional secondary endpoint was the change from baseline in the Behavior Rating Inventory of Executive Function-Adult Version (BRIEF-A) Global Executive Composite (GEC) T-score at Week 6. The BRIEF-A is a 75-item self-rating scale that assesses overall functioning (GEC) and 9 non-overlapping scales among 2 summary index scales (Metacognition Index [MI] and Behavioral Regulation Index [BRI]) that assess aspects of executive function and problems with self-regulation from the perspective of the individual. Subjects rate each item on a 3-point scale (1=Never, 2=Sometimes, or 3=Often) based on their experience within the last month. The sum of 70 items yields the GEC raw score (range: 70-210), which is converted to a T-score (normative population mean=50 and standard deviation=10; T-score ≥ 65 is considered abnormally elevated). T-score is converted to a change from baseline T-score. A lower change from baseline GEC T-score (<0) represents a better outcome.

An additional secondary endpoint was the change from baseline in the Behavior Rating Inventory of Executive Function-Adult Version (BRIEF-A) Behavioral Regulation Index (BRI) T-score at Week 6. The BRIEF-A is a 75-item self-rating scale that assesses overall functioning and 9 non-overlapping scales among 2 summary index scales. The BRI captures the ability to maintain appropriate regulatory control of one's own behavior and emotional responses. Subjects rate each item on a 3-point scale (1=Never, 2=Sometimes, or 3=Often) based on their experience within the last month. The sum of 30 items yields the BRI raw score (range: 30-90), which is converted to a T-score (normative population mean=50 and standard deviation=10; T-score ≥ 65 is considered abnormally elevated). T-score is converted to a change from baseline T-score. A lower change from baseline BRI T-score (<0) represents a better outcome.

An additional secondary endpoint was the change from baseline in the Behavior Rating Inventory of Executive Function-Adult Version (BRIEF-A) Metacognition Index (MI) T-score at Week 6. The BRIEF-A is a 75-item self-rating scale that assesses overall functioning and 9 non-overlapping scales among 2 summary index scales. MI reflects individual's ability to problem solve (includes initiate activity, generate ideas, sustain working memory, plan/organize approaches, monitor success/failure, and organize materials/environment). Subjects rate each item on a 3-point scale (1=Never, 2=Sometimes, or 3=Often) based on their experience within the last month. The sum of 40 items yields the MI raw score (range: 40-120), which is converted to a T-score (normative population mean=50 and standard deviation=10; T-score ≥ 65 is considered abnormally elevated). T-score is converted to a change from baseline T-score. A lower change from baseline MI T-score (<0) represents a better outcome.

An additional secondary endpoint was the change from baseline in the Behavior Rating Inventory of Executive Function-Adult Version (BRIEF-A) "Inhibit" scale T-score at Week 6. The BRIEF-A is a 75-item self-rating scale that assesses overall functioning and 9 non-overlapping scales among 2 summary index scales. The "Inhibit" scale is one of four Behavioral Regulation Index-related scales; it captures the ability to control impulses, appropriately stop verbal, attentional, physical behavior at the proper time. Subject's rate each item on a 3-point scale (1=Never, 2=Sometimes, or 3=Often) based on their experience within the last month. The sum of 8 items yields the "Inhibit" raw score (range: 8-24), which is converted to a T-score (normative population mean=50 and standard deviation=10; T-score ≥ 65 is considered abnormally elevated). T-score is converted to a change from baseline T-score. A lower change from baseline "Inhibit" T-score (<0) represents a better outcome.

An additional secondary endpoint was the change from baseline in the Behavior Rating Inventory of Executive Function-Adult Version (BRIEF-A) "Shift" scale T-score at Week 6. The BRIEF-A is a 75-item self-rating scale that assesses overall functioning and 9 non-overlapping scales among 2 summary index scales. The "Shift" scale is one of four Behavioral Regulation Index-related scales; it captures one's ability to move freely from one situation/activity/aspect of problem to another and think flexibly to aid problem-solving. Subjects rate each item on a 3-point scale (1=Never, 2=Sometimes, or 3=Often) based on their experience within the last month. The sum of 6 items yields the "Shift" raw score (range: 6-18), which is converted to a T-score (normative population mean=50 and standard deviation=10; T-score ≥ 65 is considered abnormally elevated). T-score is converted to a change from baseline T-score. A lower change from baseline "Shift" T-score (<0) represents a better outcome.

An additional secondary endpoint was the change from baseline in the Behavior Rating Inventory of Executive Function-Adult Version (BRIEF-A) "Emotional Control" scale T-score at Week 6. The BRIEF-A is a 75-item self-rating scale that assesses overall functioning and 9 non-overlapping scales among 2 summary index scales. The "Emotional Control" scale is one of four Behavioral Regulation Index-related scales; it captures an individual's ability to modulate their emotional responses appropriately. Subjects rate each item on a 3-point scale (1=Never, 2=Sometimes, or 3=Often) based on their experience within the last month. The sum of 10 items yields the "Emotional Control" raw score (range: 10-30), which is converted to a T-score (normative population mean=50 and standard deviation=10; T-score ≥ 65 is considered abnormally elevated). T-score is converted to a change from baseline T-score. A lower change from baseline "Emotional Control" T-score (<0) represents a better outcome.

An additional secondary endpoint was the change from baseline in the Behavior Rating Inventory of Executive Function-Adult Version (BRIEF-A) "Self-Monitor" scale T-score at Week 6. The BRIEF-A is a 75-item self-rating scale that assesses overall functioning and 9 non-overlapping scales among 2 summary index scales. The "Self-Monitor" scale is one of four Behavioral Regulation Index-related scales; it reflects an individual's ability to recognize the effect of their own behavior on others. The subject rates each item on a 3-point scale (1=Never, 2=Sometimes, or 3=Often) based on their experience within the last month. The sum of 6 items yields the "Self-Monitor" raw score (range: 6-18), which is converted to a T-score (normative population mean=50 and standard deviation=10; T-score ≥ 65 is considered abnormally elevated). T-score is converted to a change from baseline T-score. A lower change from baseline "Self-Monitor" T-score (<0) represents a better outcome.

An additional secondary endpoint was the change from baseline in the Behavior Rating Inventory of Executive Function-Adult Version (BRIEF-A) "Initiate" scale T-score at Week 6. The BRIEF-A is a 75-item self-rating scale that assesses overall functioning and 9 non-overlapping scales among 2 summary index scales. The "Initiate" scale is one of five Metacognition Index-related scales; it captures an individual's ability to begin a task or activity without external prompting and to independently generate ideas. Subjects rate each item on a 3-point scale (1=Never, 2=Sometimes, or 3=Often) based on their experience within the last month. The sum of 8 items yields the "Initiate" scale raw score (range: 8-24), which is converted to a T-score (normative population mean=50 and standard deviation=10; T-score ≥ 65 is considered abnormally elevated). T-score is converted to a change from baseline T-score. A lower change from baseline "Initiate" T-score (<0) represents a better outcome.

An additional secondary endpoint was the change from baseline in the Behavior Rating Inventory of Executive Function-Adult Version (BRIEF-A) "Plan/Organize" scale T-score at Week 6. The BRIEF-A is a 75-item self-rating scale that assesses overall functioning and 9 non-overlapping scales among 2 summary index scales. The "Plan/Organize" scale is one of five Metacognition Index-related scales; it captures an individual's ability to anticipate events, set goals, pre-plan, organize, and carry out tasks systematically. Subjects rate each item on a 3-point scale (1=Never, 2=Sometimes, 3=Often) based on their experience within the last month. The sum of 10 items yields the "Plan/Organize" raw score (range: 10-30), which is converted to a T-score (normative population mean=50 and standard deviation=10; T-score ≥ 65 is considered abnormally elevated). T-score is converted to a change from baseline T-score. A lower change from baseline "Plan/Organize" T-score (<0) represents a better outcome.

An additional secondary endpoint was the change from baseline in the Behavior Rating Inventory of Executive Function-Adult Version (BRIEF-A) "Task Monitor" scale T-score at Week 6. The BRIEF-A is a 75-item self-rating scale that assesses overall functioning and 9 non-overlapping scales among 2 summary index scales. The "Task Monitor" scale is one of five Metacognition Index-related scales; it captures an individual's ability to assess performance for mistakes during or after finishing a task. The subject rates each item on a 3-point scale (1=Never, 2=Sometimes, or 3=Often) based on their experience within the last month. The sum of 6 items yields the "Task Monitor" raw score (range: 6-18), which is converted to a T-score (normative population mean=50 and standard deviation=10; T-score ≥ 65 is considered abnormally elevated). T-score is converted to a change from baseline T-score. A lower change from baseline "Task Monitor" T-score (<0) represents a better outcome.

An additional secondary endpoint was the change from baseline in the Behavior Rating Inventory of Executive Function-Adult Version (BRIEF-A) "Organization of Materials" scale T-score at Week 6. The BRIEF-A is a 75-item self-rating scale that assesses overall functioning and 9 non-overlapping scales among 2 summary index scales. The "Organization of Materials" scale is one of five Metacognition Index-related scales; it captures one's ability to keep areas orderly and maintain materials. Subjects rate each item on a 3-point scale (1=Never, 2=Sometimes, 3=Often) based on their experience within the last month. The sum of 8 items yields the "Organization of Materials" raw score (range: 8-24), which is converted to a T-score (normative population mean=50 and standard deviation=10; T-score ≥ 65 is considered abnormally elevated). T-score is converted to a change from baseline T-score. A lower change from baseline "Organization of Materials" T-score (<0) represents a better outcome.

An additional secondary endpoint was the change from baseline in the Behavior Rating Inventory of Executive Function-Adult Version (BRIEF-A) "Working Memory" scale T-score at Week 6. The BRIEF-A is a 75-item self-rating scale that assesses overall functioning and 9 non-overlapping scales among 2 summary index scales. The "Working Memory" scale is one of five Metacognition Index-related scales; it captures one's ability to hold information in mind in order to complete a task and stay with, or stick to, an activity. Subjects rate each item on a 3-point scale (1=Never, 2=Sometimes, 3=Often) based on their experience within the last month. The sum of 8 items yields the "Working Memory" raw score (range: 8-24), which is converted to a T-score (normative population mean=50 and standard deviation=10; T-score ≥ 65 is considered abnormally elevated). T-score is converted to a change from baseline T-score. A lower change from baseline "Working Memory" T-score (<0) represents a better outcome.