Antidepressant dose and treatment response in bipolar depression: Reanalysis of the Systematic Treatment Enhancement Program for Bipolar Disorder (STEP-BD) data.

The aim of this study is to evaluate whether an adjunct antidepressant therapy at a higher dose to a mood stabilizer would make a difference in the treatment of bipolar depression. This is a post-hoc analysis of the data from the randomized treatment for acute depression of the Systematic Treatment Enhancement Program for Bipolar Disorder (STEP-BD), in which patients with bipolar depression were randomly assigned to treatment with a mood stabilizer plus adjunctive antidepressant drugs or placebo. According to the highest dose received in the course of treatment, the subjects were divided into one of the following three groups: high-dose, low-dose and placebo groups. The primary and secondary outcomes were durable recovery (which was operationally defined as eight consecutive weeks with