Olanzapine Versus Lithium in the Treatment of Acute Depression in Patients With Bipolar II or Bipolar Not Otherwise Specified(OL Study)

Inclusion Criteria: * major depressive episode in type2 bipolar disorder or bipolar disorder NOS.(MADRS more than 20 point) * 18years to 65years * subjects who sign the informed consent document Exclusion Criteria: * don't have Diabetes and abnormal metabolism of sugar * not noticed as bipolar disorder * have an organic brain disease * pregnant or breastfeeding women * don't have heart disease * have actively suicidal thought(Suicidal ideation score of MADRS is 6) * who are judged by the investigator to should be excluded from the study