A nasal spray version of the drug ketamine has shown promise as an antidepressant, even if its properties still aren’t well understood. The approval of esketamine marks a new approach to treating serious mood problems, experts said. Prozac and similar drugs enhance the activity of brain messengers such as serotonin; they are mildly effective, but they take… Continuar lendo Fast-Acting Depression Drug, Newly Approved, Could Help Millions: Doctors Welcome New Depression Drug, Cautiously.