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Objective: Esketamine, the S-enantiomer of ketamine, was recently approved as a rapid-acting intranasal therapy for depression and is currently under development for suicidality. The authors sought to determine the efficacy of adjunctive intranasal esketamine in major depressive disorder (MDD).

Data Sources: A systematic search of PubMed/MEDLINE was conducted up to January 2019, in addition to abstracts of major psychiatric meetings held since 2010. Searches were conducted by cross-referencing the term intranasal with the term esketamine. Where necessary, authors and/or study sponsors were contacted in order to obtain a copy of the presentation as well as any pertinent study details.

Study Selection: 241 study abstracts were initially identified and reviewed. Selected studies were randomized, double-blind clinical trials comparing adjunctive intranasal esketamine to adjunctive placebo for MDD.

Data …