{"doi":"10.1111/bdi.70048","title":"Defining Treatment‐Resistant Bipolar Depression: Recommendations From the <scp>ISBD</scp> Task Force","abstract":"OBJECTIVE: Despite the availability of approved treatments, a substantial proportion of patients with bipolar disorder experience treatment-resistant bipolar depression (TRBD), characterized by persistent depressive symptoms unresponsive to standard therapies. However, a universally accepted definition of TRBD is lacking. This consensus document, developed by the International Society for Bipolar Disorders (ISBD) Task Force on TRBD, aims to provide a standardized definition of TRBD to facilitate clinical trials, research, and treatment strategies. METHODS: The Task Force employed a literature review, clinical trials analysis, and expert consensus meetings to define TRBD. RESULTS: TRBD was defined as the failure to achieve a significant and sustained clinical response after at least two approved and adequately dosed pharmacological treatments, administered for a sufficient duration with treatment adherence. For bipolar I (BD-I) depression, approved treatments included quetiapine (300-600 mg/day for ≥ 8 weeks), lurasidone (20-120 mg/day for ≥ 6 weeks), the combination of olanzapine (6-12 mg/day) and fluoxetine (25-75 mg/day for ≥ 8 weeks), cariprazine (1.5-3 mg/day for ≥ 6 weeks), and lumateperone (42 mg/day for ≥ 6 weeks). For bipolar II (BD-II) depression, approved treatments included quetiapine (300-600 mg/day for ≥ 8 weeks) and lumateperone (42 mg/day for ≥ 6 weeks). CONCLUSION: This consensus definition aims to provide clarity for clinical trials, improve consistency in research, and guide treatment approaches and inform regulatory pathways. It represents a foundational step in addressing the unmet needs in TRBD and promoting the development of innovative therapeutic strategies. Future efforts will focus on adapting the definition to better align with real-world clinical challenges and optimize patient care.","journal":"Bipolar Disorders","year":2025,"id":512646,"datarank":0.0,"base_score":0.0,"endowment":0.0,"self_citation_contribution":0.0,"citation_network_contribution":0.0,"self_endowment_contribution":0.0,"citer_contribution":0.0,"corpus_percentile":null,"corpus_rank":null,"citation_count":12,"citer_count":0,"citers_with_citation_signal":0,"citers_with_endowment":0,"datacite_reuse_total":0,"is_dataset":false,"is_dataset_confidence":0.8997,"is_data_producer":false,"deposit_databanks":null,"is_oa":true,"file_count":0,"downloads":0,"has_version_chain":false,"published_date":"2025-01-01","fair_score":null,"fair_percentile":null,"algorithm_id":"datarank_citation_only_1hop_v6","ranking_scope":"data_only","authors":[{"id":324331,"name":"Roger S. 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