['attention deficit hyperactivity disorder']
['aevi-001', 'placebo']

        Inclusion Criteria:

          1. Subject and parent/legally authorized representative (LAR) can speak English fluently
             and have provided written informed consent, and assent (as applicable) for this study.

          2. Subject is 6 to 17 years of age (inclusive) at the time of consent/assent. The date of
             signature of the informed consent/assent is defined as the beginning of the Screening
             Period. This inclusion criterion will only be assessed at the Screening Visit (Visit
             1).

          3. Subject is male or non-pregnant, non-lactating female, who if of childbearing
             potential agrees to comply with any applicable contraceptive requirements prior to
             administration of investigational product (IP).

          4. Subject meets Diagnostic and Statistical Manual of Mental Disorders, Fifth Edition
             (DSM-5) criteria for a primary diagnosis of ADHD based upon DSM 5 criteria.

          5. Subject has a minimum score of ≥28 on the ADHD-RS-5 at the Baseline Visit (Visit 2).

          6. Subject has been genotyped previously and has their identity confirmed (if required).

        Exclusion Criteria:

          1. Subject or parent/LAR is, in the opinion of the investigator, mentally or legally
             incapacitated, has significant emotional problems at the time of the Screening Visit
             (Visit 1) which could interfere with the conduct of study evaluations.

          2. Subject has a current, controlled or uncontrolled, co-morbid major psychiatric
             diagnosis (aside from ADHD), including an anxiety disorder, major depression, bipolar
             disease, schizophrenia (or any psychotic disorder), and moderate or severe
             intellectual disability. Mild anxiety and/or depressive symptoms that do not meet
             diagnostic criteria for an anxiety disorder or major depression and/or do not require
             treatment are not exclusionary.

          3. Subject has autism spectrum disorder to include a DSM-IV diagnosis of autistic
             disorder, Asperger's disorder, or pervasive developmental disorder.

          4. Subject is currently taking any medication that might confound the results of safety
             assessments conducted in the study.

          5. Subject has a known history of cardiovascular disease, advanced arteriosclerosis,
             structural cardiac abnormality, cardiomyopathy, serious heart rhythm abnormalities,
             coronary artery disease, cardiac conduction problems, exercise-related cardiac events
             including syncope and pre-syncope, or other serious cardiac problems.

          6. Subject has any clinically significant abnormality on 12-lead ECG performed at the
             Screening Visit (Visit 1) and/or the Baseline Visit (Visit 2) such as serious
             arrhythmia, cardiac conduction problems, or other abnormalities deemed to be a
             potential safety issue.
      