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This study evaluated once-daily extended-release quetiapine fumarate (quetiapine XR) as adjunctive therapy in patients with major depressive disorder (MDD) with inadequate response to ongoing antidepressant treatment. In this 8-wk (6-wk active treatment/2-wk post-treatment drug-discontinuation/follow-up), multicentre, double-blind, placebo-controlled, Phase III study, 446 patients were randomized to quetiapine XR 150 mg/d, 300 mg/d, or placebo adjunct to ongoing antidepressant treatment. The primary endpoint was the change from randomization to week 6 in Montgomery-Asberg Depression Rating Scale (MADRS) total score. At week 6, MADRS total scores significantly improved with quetiapine XR 300 mg/d vs. placebo (-14.7 vs. -11.7, p&lt;0.01). Quetiapine XR 300 mg/d showed significant improvements vs. placebo for: MADRS total score from week 1 onwards; MADRS response [(&gt; or = 50% total score reduction) 58.9% vs. 46.2%, p&lt;0.05] and remission [(total score &lt; or = 8) 42.5% vs. 24.5%, p&lt;0.01] rates; Hamilton Depression Rating Scale (HAMD) (-13.53 vs. -10.80, p&lt;0.01) and Clinical Global Impression-Severity of illness (CGI-S) change (-1.52 vs. -1.23, p&lt;0.05) at week 6. For quetiapine XR 150 mg/d, improvements were not significantly different vs. placebo, except for MADRS (weeks 1 and 2) and HAMD (week 6) total scores. Withdrawal rates due to adverse events (AEs) were: quetiapine XR 150 mg/d 11.5%, 300 mg/d 19.5%, and placebo 0.7%. The most common AEs (&gt;10%) with quetiapine XR were dry mouth, somnolence, sedation, dizziness, constipation, nausea, insomnia, headache, and fatigue. In this study, quetiapine XR 300 mg/d as adjunctive therapy in patients with MDD with an inadequate response to ongoing antidepressant treatment was effective at week 6. However, the difference from placebo for quetiapine XR 150 mg/d at week 6 was not statistically significant. Both doses studied (150 and 300 mg/d) were effective at week 1 and generally well tolerated.

international journal of neuropsychopharmacology

Extended-release quetiapine fumarate (quetiapine XR) as adjunctive therapy in major depressive disorder (MDD) in patients with an inadequate response to ongoing antidepressant treatment: a multicentre, randomized, double-blind, placebo-controlled study