Oxcarbazepine for the treatment of bipolar and depressive disorders in the outpatient setting: A retrospective chart review

Oxcarbazepine is often utilized off-label for bipolar and depressive disorders in outpatient settings despite limited evidence. We performed a retrospective chart review on 38 adult outpatients diagnosed with bipolar and depressive disorders (ICD-10 codes F30-39), treated with oxcarbazepine by psychiatrists and psychiatric nurse practitioners between 2015 and 2021. Primary outcomes were Clinical Global Impression Severity (CGI-S) and Improvement (CGI-I) scores, assigned retrospectively from clinical documentation. Patients were predominantly female (70%), aged 20–76 (mean 36), with a mean of 1.8 diagnoses (range 1–4) and 1.7 (range 0–5) concurrent psychotropic medications. A starting oxcarbazepine dose of 489 mg/day, titrated to a mean final dose of 663 mg/day, was associated with a CGI-I of 2.5 [2.25, 2.75] and a pre-to-post treatment decrease in CGI-S from 3.4 to 2.4. Overall response and remission rates were 52% and 29%, respectively. Limitations of this study include potential sample bias, documentation bias and rater bias among other limitations inherent to retrospective study designs.