A method of treating at least one symptom or condition associated with but not limited to: Mood Disorders including but not limited to a) Depressive Disorders, including but not limited to, Major Depressive Disorder and Dysthymic Disorder and b) Bipolar Depression and/or Bipolar mania including but not limited to Bipolar I Disorder, including but not limited to those with manic, depressive or mixed episodes, and Bipolar II Disorder, c) Cyclothymic Disorder, and d) Mood Disorder Due to a General Medical Condition, comprising administering an effective amount of formula (I) or its pharmaceutically acceptable salt. In another aspect of the invention a pharmaceutical composition is provided comprising an effective amount of formula (I) or its pharmaceutically acceptable salt and at least one pharmaceutically acceptable carrier or diluent.