Ketamine therapies can offer rapid relief of depression and an antisuicidal effect, making them of particular interest for adolescents with treatment-resistant depression. In 1 randomized, double-blind study of adolescents with severe major depression, ketamine had a strong effect size for reducing depressive symptoms 24 hours after infusion. Currently, there is minimal investigation and few studies on the use of ketamine in treatment-resistant adolescents with depression.