A Study to Evaluate the Efficacy and Safety of Eptinezumab Administered Intravenously in Participants Experiencing Acute Attack of Migraine

This will be a parallel group, double-blind, randomized, placebo-controlled study assessing the efficacy of eptinezumab for acute migraine, defined as an active intercurrent migraine occurring in those participants who are candidates for preventive therapy. Participants will be randomized to receive a single dose of eptinezumab or placebo in a 1:1 ratio. The total study duration will be approximately 4 to 12 weeks, including up to an 8-week screening period and 4-week of safety follow-up, with clinic visits occurring on Screening, Day 0 (dosing day), and Week 4.