A study to assess the efficacy and safety of TC-5214 as an adjunct therapy in patients with major depressive disorder (MDD)

The purpose of this study is to determine if TC-5214 or placebo (a tablet that looks like medicine tablet or capsule, but contains no active medicine) is safe and effective when taken together with another antidepressant.

A multicenter, randomized, double-blind, parallel group, placebo-controlled, phase III efficacy and safety study of TC-5214 (S-mecamylamine) in flexible doses as an adjunct to an antidepressant in patients with major depressive disorder with an inadequate response to antidepressant therapy.