- subjects must have bipolar I, II or NOS disorder as defined by DSM-IV-TR; must have clinical significant depressive symptoms and have failed one or more mood stabilizer trials; may or may not be receiving antimanic or mood stabilizing medications; subjects or legally authorized representative must sign the Informed Consent document after the nature of the trial has been fully explained; if female, subjects must be postmenopausal, surgically incapable of childbearing or practicing medically acceptable effective method(s) of contraception.