Adjunctive Brexpiprazole and Functioning in Major Depressive Disorder: A Pooled Analysis of Six Randomized Studies Using the Sheehan Disability Scale

Abstract Background Patients with major depressive disorder and inadequate response to antidepressant treatments may experience a prolonged loss of functioning. This post hoc analysis aimed to determine the effect of adjunctive brexpiprazole on functioning in such patients. Methods A pooled analysis of data from the 6-week, randomized, double-blind treatment phases of 6 studies of adjunctive brexpiprazole (2 and 3 mg/d in fixed-dose studies; 1–3 mg/d in flexible-dose studies) vs placebo in patients with major depressive disorder and inadequate response to antidepressant treatments (NCT01360645, NCT01360632, NCT02196506, NCT01727726, NCT00797966, NCT01052077). Functioning was measured by change in Sheehan Disability Scale score from baseline to week 6. Results Considering Sheehan Disability Scale mean score across all 6 studies (n = 2066 randomized), the least squares mean difference between antidepressant treatments + brexpiprazole and antidepressant treatments + placebo at week 6 was −0.40 (95% CI: −0.56, −0.23; P < .0001). Antidepressant treatments + brexpiprazole showed a greater benefit than antidepressant treatments + placebo on the social life (−0.45; −0.63, −0.27; P < .001) and family life (−0.50; −0.70, −0.31; P < .001) items but not on the work/studies item (−0.16; −0.38, 0.06; P = .16). Pooled analyses of just the (1) fixed-dose, (2) flexible-dose, and (3) Phase 3 studies showed the same pattern of benefits for antidepressant treatments + brexpiprazole. Conclusions Brexpiprazole, as adjunct to antidepressant treatments, improved functioning in patients with major depressive disorder and inadequate response to antidepressant treatments.