Compositions and methods of treating depression infections are provided. More particularly, compositions including a combination of ketamine and a cytochrome p450 enzyme inhibitor are provided. Methods of using the compositions for treatment of depression, including treatment-resistant or treatment-refractory depression, are provided.Compositions and methods of treating depression infections are provided. More particularly, compositions including a combination of ketamine and a cytochrome p450 enzyme inhibitor are provided. Methods of using the compositions for treatment of depression, including treatment-resistant or treatment-refractory depression, are provided.