This is a multicenter study to evaluate if the effectiveness of desvenlafaxine succinate sustained-release tablet (50 mg/day) used for 8 weeks is not inferior to duloxetine hydrochloride enteric-coated capsule (60 mg/day) in adult patients with major depressive disorder. A total of 400 subjects will be randomly allocated to experimental arm (desvenlafaxine succinate sustained-release tablet) and active comparator arm (duloxetine hydrochloride enteric-coated capsule) in a 1:1 ratio.
The primary purpose of this study is to evaluate if the effectiveness of desvenlafaxine succinate sustained-release tablet (50 mg/day) used for 8 weeks is not inferior to duloxetine hydrochloride enteric-coated capsule (60 mg/day) in adult patients with major depressive disorder.