The MEASURE Study - A Phase 3 Study of MDX 1400 mg Daily Compared With Placebo in Adults With ADHD

- A 10-week randomized, multi-center, double-blind, placebo-controlled, phase 3 study of
MDX (1400 mg daily) for 10 weeks compared with placebo in adults with ADHD.

- The study will be comprised of Screening, Washout (if required), Treatment (total of 10
weeks) and Follow-up periods. Approximately 750 patients will be enrolled and undergo
initial eligibility assessments.

- Subjects requiring a washout will undergo a Washout period where ADHD medication is
discontinued (21 days for atomoxetine, 14 days for other ADHD medications). These
subjects will have an Interim Visit (off drug) on or about Day -10 (Day -10 to Day -3)
for CAARS-Inv assessment at the end of the Washout period.

- Subjects will be randomly assigned to placebo/MDX for a total treatment duration of up
to ten weeks.

There will be a one week Follow-up period after the last dose of study treatment or early
termination.

Inclusion Criteria:

1. Subject is a man or a non-pregnant, non-lactating woman 18 to 55 years of age,
inclusive, at the Screening visit.

2. Subject has a diagnosis of ADHD based on criteria in the Diagnostic and Statistical
Manual of Mental Disorders, Fifth Edition (DSM5) as assessed by the Adult ADHD
Clinician Diagnostic Scale, (ACDS Version 1.2) modified for DSM-IV and DSM5
diagnoses; a diagnosis of ADHD not otherwise specified is unacceptable.

3. Male and Female subjects of childbearing potential must agree to use an effective
contraceptive throughout the study

4. Subject is able to attend the clinic regularly and reliably.

5. Subject is able to swallow tablets and capsules.

6. Subject is able to understand, read, write, and speak the local language fluently to
complete the study-related materials.

7. Subject is able to understand and sign an informed consent form to participate in the
study.

Exclusion criteria

1. Subject has any current major psychiatric condition (e.g., schizophrenia, bipolar or
personality disorder) or autism spectrum disorder.

2. Subject has any clinically significant or unstable medical or surgical condition that
may preclude safe and complete study participation.

3. Subject has used an investigational medication/treatment or was enrolled in another
clinical trial in the 30 days before the Screening visit.

4. Subject has used any medication or food supplement that the investigator or the
medical monitor consider unacceptable during the 14-day period before the Baseline
visit.

5. Subject's alcohol and caffeine intake will be assessed.

6. Subject has current suicidality, defined as active ideation, intent or plan, or any
significant lifetime suicidal behavior (actual attempt, aborted attempt, interrupted
attempt, or act or preparation towards imminently making a suicide attempt). Subjects
exhibiting history (within previous 12 months) of non-suicidal self-injurious
behavior will be excluded.

7. Subject has taken any prescription or non-prescription medication for ADHD during the
14 days (or 21 days for atomoxetine) before the Baseline visit. Subjects will not be
allowed to take any other medications for ADHD besides the study medication (when
prescribed) after the washout period and for the duration of the study, up to and
including the safety Follow-up visit. (Other ADHD medications should NOT be
prescribed to subjects before completion of the Follow-up visit or Early Termination
Visit).

8. Subject is significantly visually impaired to an extent that is not able to be
corrected by prescription glasses or contact lenses.

9. Subject is closely related to the sponsor, investigator, or study staff. Eligibility
of subjects with any relationship to the sponsor, investigator, or study staff will
be discussed with the medical monitor before study entry, and the medical monitor
will decide on the eligibility of these cases.

10. Subject has previously been enrolled in an MDX clinical trial.

11. Subject lives in the same household as another subject in this clinical trial or in
another on-going trial with MDX. Subject lives in the same household as someone who
has previously participated in a trial with MDX.

12. Subject has any condition that, in the principal investigator's opinion, would place
the subject at risk or influence the conduct of the study or interpretation of
results, including (but not limited to) abnormally low intellectual capacity as
judged by the investigator.

13. Subject cannot fully comprehend the implications of the protocol, cannot comply with
its requirements, or is incapable of following the study schedule for any reason.

14. Subject is pregnant, lactating, or using an inadequate contraceptive method. Complete
entry criteria will be reviewed and evaluated individually by a protocol trained
delegate.