What this phase means
Phase 3: this treatment already looked useful in smaller studies. Now it is tested in a large group, often against standard care or a dummy treatment, to see if it should be approved.
Phase labels are FDA/ICH categories applied to the registry Phase field. They are not a finding that this study succeeded.
What the registry says happens
If you join, the listed intervention(s) are Esketamine 56 mg, Esketamine 84 mg, or Placebo. The registry lists allocation as randomized. This study wants to evaluate how well each individual dose of esketamine (56 milligrams \[mg\] and 84 mg) works when compared with dummy treatment (placebo) in improving depressive symptoms in participants with treatment resistant depression (individuals with major depressive disorder \[major depression\] who have not responded to at least 2 different antidepressant treatments given at an adequate dose for an adequate duration in the current episode of depression).
They plan to enroll about 348 people at 39 sites. Taking part typically means taking a study drug (or dummy pill) plus check-ins.
Official title (unrewritten)
A Randomized, Double-blind, Multicenter, Placebo-controlled Study to Evaluate the Efficacy, Safety, and Tolerability of Esketamine Nasal Spray, Administered as Monotherapy, in Adult Participants With Treatment-resistant Depression
Interventions: Esketamine 56 mg, Esketamine 84 mg, Placebo
Primary outcome (registry wording): Double-Blind (DB) Treatment Phase: Change From Baseline in Montgomery-Asberg Depression Rating Scale (MADRS) Total Score From Day 1 to the End of the 4-Week Double-Blind Treatment Phase