Safety and Efficacy Workplace Environment Study of Lisdexamfetamine Dimesylate (LDX) in Adults With Attention-Deficit Hyperactivity Disorder (ADHD)

To evaluate the efficacy of LDX compared to placebo in adults with ADHD in the adult workplace environment (AWE) setting

This study has both an optimization and double-blind period

Eligibility Criteria:
Inclusion Criteria:

* Subject must be 18-55 years of age, inclusive at the time of consent.
* Female subjects must have a negative serum beta Human Chorionic Gonadotropin (HCG) pregnancy test at Screening and a negative urine pregnancy test at Baseline and agree to comply with any applicable contraceptive requirements of the protocol.
* Subject meets Diagnostic and Statistical Manual of Mental Disorders Fourth Edition; Text Revision (DSM IV TR) criteria for a primary diagnosis of ADHD (diagnostic code 314.00 and 314.01) established by a comprehensive psychiatric evaluation that reviews DSM-IV-TR criteria with at least 6 of the 9 subtype criteria met. The Adult ADHD Clinical Diagnostic Scale version 1.2 (ACDS v1.2) will be utilized as the diagnostic tool.
* Subject has a Baseline score of \> or equal to 28 using the Adult ADHD-RS with prompts.
* Subject must have a minimum level of intellectual functioning, as determined by an Intelligent Quotient (IQ) score of 80 or above based on the Kaufman Brief Intelligence Test (KBIT).

Exclusion Criteria:

* Subject has a current comorbid psychiatric disorder that is either controlled with medications prohibited in this study or is uncontrolled and associated with significant symptoms. Comorbid psychiatric diagnoses will be established by the psychiatric evaluation that includes the Structured Clinical Interview for DSM-IV-TR disorders (SCID-I).
* Subjects who are currently considered a suicide risk, any subject who has previously made a suicide attempt or those who are currently demonstrating active suicidal ideation.
* Subject has a history of seizures (other than infantile febrile seizures), any tic disorder, or a current diagnosis and/or a known family history of Tourette's Disorder.
* Subject has known history of symptomatic cardiovascular disease, advanced arteriosclerosis, structural cardiac abnormality, cardiomyopathy, serious heart rhythm abnormalities, coronary artery disease, transient ischemic attack or stroke or other serious cardiac problems that may place them at increased vulnerability to the sympathomimetic effects of a stimulant drug.
* Subject has current abnormal thyroid function, as defined as abnormal Screening thyroid stimulating hormone. Treatment with a stable dose of thyroid medication for at least 3 months is permitted.
* Subject has a history of moderate to severe hypertension or has a resting sitting systolic blood pressure \>139mmHg or diastolic blood pressure \>89mmHg.
* Subject has a documented allergy, hypersensitivity, or intolerance to amphetamines.
* Subject has failed to respond to one or more adequate courses (dose and duration) of amphetamine therapy.
* Subject has glaucoma.
* Subject is taking other medications that have central nervous system (CNS) effects or affect performance, such as sedating antihistamines and decongestant sympathomimetics, or are monoamine oxidase inhibitors (during or within 14 days of test or reference product administration). Stable use of bronchodilator inhalers is not exclusionary.
* Subject is female and pregnant or lactating.