Efficacy Study of Lisdexamfetamine to Treat Bipolar Depression

Inclusion Criteria: * Men and women, through the ages of 18 and 55 years, inclusive. Exclusion Criteria: * Women who are pregnant, lactating, or of childbearing potential who are not using adequate contraceptive measures. * Subjects who are displaying clinically significant homicidality or suicidality * Clinically unstable medical disease, including cardiovascular, hepatic, renal, gastrointestinal, pulmonary, metabolic, endocrine or other systemic disease. Subjects should be biochemically euthyroid to enter the study.