1. Male or female child 4-5 years of age at screening.
2. Signed and dated informed consent provided by the subject's parent/legal and assent of
the child (as applicable).
3. Meets DSM-5 criteria for ADHD based on the K-SADS-PL.
4. ADHD RS-IV Preschool—Home Version score at Screening and Baseline >/= 90th percentile
for gender and age in >/=1 of the following: hyperactive-impulsive subscale,
inattentive subscale, or total score.
5. Peabody Picture Vocabulary Test 4 (PPVT—4)Standard Score >/=70.
6. Child Global Assessment Scale (CGAS) score = 55.
7. Participation in a school type program (day care, preschool, kindergarten,
transitional kindergarten, or elementary school) for at least >/=2 half days of the
week for at least 3 months and that is anticipated to continue during the study.
8. History of an adequate course of non medication treatment for ADHD based on
investigator judgment or, where such treatments are not available, the severity of the
subject's ADHD symptoms are such that medication treatment is deemed necessary by the
1. Treated with atomoxetine within 30 days prior to the Baseline.
2. Received any investigational products or devices within 30 days prior to the Baseline
3. History of stimulant nonresponse, intolerability or hypersensitivity to any dose of
methylphenidate or other stimulant. If a known allergy to D&C red #30, he/she should
not be enrolled in the study.
4. An intelligence quotient (IQ)
5. History of acute or chronic medical or psychiatric condition or cardiac or laboratory
6. Less than 5th percentile for height or weight at Screening.
7. History of recent clinically significant self-harming behaviors.