Safety and Efficacy of Low Dose MM-120 for ADHD Proof of Concept Trial

Inclusion Criteria:

* Male and female outpatients ≥ 18 and ≤ 65 years of age at Screening
* Patients with the diagnosis of Diagnostic and Statistical Manual of Mental Disorders-5 (DSM-5) ADHD, as determined by clinical evaluation and confirmed by structured interview (MINI).
* Adequate organ function.
* Able to understand the study procedures and understand risks associated with the study, and sign written informed consent to participate in the study.
* Must be willing to refrain from more than 6 standard alcoholic drinks a week, more than 10 cigarettes a day, and more than 2 cups of coffee a day throughout the study treatment period (6 weeks) and until the last study visit is complete.

Exclusion Criteria:

* Past or present diagnosis of a primary psychotic disorder or first degree relative with a psychotic disorder.
* Past or present bipolar disorder (DSM-5).
* Any lifetime history of suicide attempt.
* Once Informed Consent form is signed, not willing or able to stop any prescription or non-prescription ADHD medications.
* Use of investigational medication/treatment in the past 30 days.
* Patients with a positive urine drug screen with the exception of THC or its metabolites.
* Pregnant or nursing females.