Esketamine nasal spray: An option for patients with treatment-resistant depression

Treatment-resistant depression (TRD) is a particularly challenging form of major depressive disorder. As Albino Oliveira-Maia, head of the Champalimaud Foundation’s Neuropsychiatry Unit and the study’s national coordinator for Portugal, explains, “TRD is defined as the persistence of depressive symptoms despite adequate courses of at least two different antidepressant medications.” Despite repeated therapeutic attempts, these patients’ depressive symptoms remain.