2. Subjects with the diagnosis of Bipolar or Bipolar Spectrum Disorder and currently displaying manic, hypomanic, or mixed symptoms (with or without psychotic features), by DSM-IV, as manifested in clinical evaluation and confirmed by structured interview. Bipolar Spectrum Disorder (or sub- threshold bipolar disorder) is operationalized as having severe mood disturbance, which meets DSM-IV Criteria A for bipolar disorder but display fewer elements in Criteria B (only require 2 items for elation category and 3 for irritability).