Efficacy and safety of adjunctive aripiprazole in major depressive disorder in older patients: a pooled subpopulation analysis.

ABSTRACT

OBJECTIVES: To evaluate the efficacy and safety of adjunctive aripiprazole compared with standard antidepressant therapy (ADT) for older patients with major depressive disorder (MDD) who demonstrated an incomplete response to standard antidepressant monotherapy. METHODS: Data from three similar 14-week studies (an 8-week prospective ADT treatment phase and a 6-week randomized, double-blind phase) of aripiprazole augmentation were pooled for this post hoc analysis. Two age groups were defined younger patients (aged 18-49 years) and older patients (aged 50-67 years). The older patient group was further divided into three subgroups 50-55, 56-60, and 61-67 years. The efficacy endpoint was the mean change in Montgomery-Åsberg Depression Rating Scale (MADRS) total score from end of the prospective phase (Week 8) to endpoint (Week 14, last observation carried forward (LOCF)). Remission was defined as MADRS total score ≤10 at endpoint. RESULTS: Four hundred and nine older patients (placebo, n = 198; aripiprazole, n = 211) and 679 younger patients (placebo, n = 341; aripiprazole, n = 338) were included in this analysis. Older patients receiving aripiprazole demonstrated significantly greater improvement in MADRS total score versus placebo at Week 14 (-10.0 vs. -6.4; p < 0.001; LOCF), similar to the improvement seen in younger patients. Remission rates were significantly higher with aripiprazole versus placebo in older (32.5% vs. 17.1%; p < 0.001) and younger (26.9% vs. 16.4%; p < 0.001) patients. Akathisia was the most common adverse event in both the older (17.1%) and younger (26.0%) patient groups. CONCLUSIONS: Adjunctive aripiprazole was effective in improving depressive symptoms in older patients, 50-67 years, with MDD who have had an inadequate response to standard antidepressant medication.