A Study of Eptinezumab in Participants With Migraine and Medication Overuse Headache

Inclusion Criteria: * The participant has a diagnosis of migraine or MOH as defined by IHS ICHD-3 guidelines confirmed at the Screening Visit. * The participant has ≥8 migraine days per month for each month within the past 3 months prior to the Screening Visit. * The participant has ≥15 headache days per month for each month within the past 3 months prior to the Screening Visit. * The participant has had an onset of migraine diagnosis at ≤50 years of age. Exclusion Criteria: * The participant has confounding and clinically significant pain syndromes (for example, fibromyalgia, chronic low back pain, and complex regional pain syndrome). * The participant has a diagnosis of acute or active temporomandibular disorders. * The participant has a history or diagnosis of chronic tension-type headache, hypnic headache, cluster headache, hemicrania continua, new daily persistent headache, or unusual migraine subtypes such as hemiplegic migraine (sporadic and familial), recurrent painful ophthalmoplegic neuropathy, migraine with brainstem aura, and migraine with neurological accompaniments that are not typical of migraine aura (diplopia, altered consciousness, or long duration). * The participant has psychosis, bipolar mania, dementia, or any other psychiatric conditions whose symptoms are not controlled or who has not been adequately treated for a minimum of 6 months prior to the Screening Visit. * The participant has a history of clinically significant cardiovascular disease includ…