Brief Summary:

This study is a multi-center, randomized, 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.