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Background and Purpose: In the phase 3b, randomized, double-blind, placebo-controlled DELIVER clinical trial, eptinezumab reduced migraine frequency and headache in adults with two to four prior preventive treatment failures. Here, the effect of eptinezumab on coinciding patient-reported outcomes is reported., Methods: Adults were randomized to receive eptinezumab 100, 300 mg or placebo intravenously at weeks 12 and 24. The EQ-5D-5L, measuring overall patient health, and the six-item Headache Impact Test were completed every 4 weeks. The Patient Global Impression of Change was completed at weeks 4, 12 and 24. Patient-identified most bothersome symptom and the Migraine-Specific Quality of Life Questionnaire were administered at weeks 12 and 24., Results: Eptinezumab improved patient-reported outcomes more than placebo, starting at week 4 and at all subsequent time points. By week 12, patients' overall health (EQ-5D-5L visual analog scale score) improved with eptinezumab treatment (difference from placebo in change from baseline: 100 mg, 5.1, 95% confidence interval [CI] 2.2, 8.1, p < 0.001; 300 mg, 7.5, 95% CI 4.5, 10.4, p < 0.0001). At week 12, eptinezumab improved headache-related quality of life (difference from placebo in change from baseline in Headache Impact Test total score: 100 mg, -3.8, 95% CI -5.0, -2.5, p < 0.0001; 300 mg, -5.4, 95% CI -6.7, -4.2, p < 0.0001), including each Migraine-Specific Quality of Life Questionnaire domain (p ≤ 0.0001, all comparisons). Over twice as many patients receiving eptinezumab than placebo reported much or very much improvement on the Patient Global Impression of Change and patient-identified most bothersome symptom., Conclusion: Patients with two to four prior preventive treatment failures receiving eptinezumab versus placebo reported greater improvements in well-being, quality of life and most bothersome symptoms compared to placebo., Trial Registration: ClinicalTrials.gov identifier: NCT04418765; EudraCT identifier: 2019-004497-25., (© 2022 The Authors. European Journal of Neurology published by John Wiley & Sons Ltd on behalf of European Academy of Neurology.)