Vortioxetine Adjunctive Treatment in Bipolar Depression

This study initiated by The first affiliated hospital of zhejiang university. Professor Shao-hua Hu will be PI of the study. There are about 80 patients with bipolar II depressive episode were involved in this study, all participants after 4 weeks of monotherapy (quetiapine or lurasidone). Group A: Those patients who were treated effectively over the 4th weekend {Reduction rate of 17 items of the Hamilton Depression Scale (HDS-17) \>50%} continued with the original regimen for 4 weeks. Subjects who did not meet valid criteria (HSDRS-17 subscore ratio\<50%) were randomly assigned to two treatment groups: group B (quetiapine/lurasidone + vortioxetine tablets) and group C (quetiapine/lurasidone + sodium valproate sustained release tablets). Subjects in group B were given vortioxetine in combination with their original treatment regimen at week 5; Subjects in group C began to receive sodium valproate sustained-release tablets in combination with the original treatment regimen at week 5. All three groups were observed at the end of the 16th week. Group A: single drug treatment group: quetiapine tablet 300mg\~600mg/d or Lurasidone tablet 40-120mg /d; Group B: quetiapine tablets 300mg\~600mg/d or Lurasidone tablets 40-120mg /d+ vortioxetine 5-10mg /d Group C: quetiapine tablets 300mg\~600mg/d or Lurasidone tablets 40-120mg /d+ sodium valproate sustained release tablets 0.5-1.0 /d Quetiapine or lurasidone is currently the first-line treatment for bipolar II depressive episodes, ensuring effective treatment for all subjects. The study program will last 16 weeks with seven study visits including screening. For the consideration of scientific, legal and ethical factors, 100 subjects are initially planned to be enrolled in this experiment.