Novel treatment strategies for the management of refractory bipolar disorder

INTRODUCTION: Bipolar disorder is often treatable with conventional psychopharmacology. Despite the availability of numerous established treatments for bipolar disorder, cases of treatment resistance persist. The identification of optimal therapies proves challenging, as the term treatment resistance lacks a clear, standardized definition. Ambiguity in defining frequency, duration, and number of medication failures across the different subtypes of refractory bipolar disorder contributes to an inconsistent framework which negatively impacts both clinical decision making and clinical outcomes. AREAS COVERED: This review article surveys updated novel treatments for the subtypes of refractory bipolar disorder in adult and pediatric populations. Treatment-resistant acute mania, rapid cycling, and bipolar depression in adult populations are reviewed, and studies in pediatric treatment-resistant bipolar disorder are overviewed. A literature search was conducted using MEDLINE and focused on studies published between 2015 and 2025 to highlight the latest research findings in this area of interest. EXPERT OPINION: Future directions offer optimism through precision medicine, but a comprehensive conclusive survey of treatment-resistant bipolar disorder remains premature in its current state of research. Current challenges underscore the importance of creating a clearly defined classification system to improve diagnostic clarity and the consistency of research and clinical outcomes.