One in five people will experience major depressive disorder (MDD) at some point in their lives. Although depression is common, traditional selective serotonin reuptake inhibitors (SSRIs) such as Prozac (fluoxetine) and serotonin-norepinephrine reuptake inhibitors (SNRIs) help about 40–60% of people within six to eight weeks. For those who don’t respond to the first treatment, however,…