Depression: Managing Resistance and Partial Response to Treatment.
Abstract
Treatment-resistant depression is defined as absence of remission despite trials of two or more antidepressant medications and can occur in up to 31% of patients with major depressive disorder. Partial response to treatment is defined as less than 50% reduction in depression-rating scores. Before diagnosing treatment-resistant depression or partial response to treatment, adherence to adequate doses and duration of medications should be confirmed. Management strategies include adding psychotherapy, switching antidepressant medication class, or augmenting with additional medications. Current guidelines recommend augmentation with a second-generation antidepressant, an atypical antipsychotic, tricyclic antidepressants, lithium, or a triiodothyronine medication as pharmacologic options. Ketamine and esketamine can also be used as augmentation for treatment-resistant depression and may help reduce suicidal ideation. Electroconvulsive therapy and repetitive transcranial magnetic stimulation may be effective. Pharmacogenetic testing has limited evidence and is not recommended. Nonpharmacologic therapies include psychotherapy, exercise, and focused dietary changes.
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