The study includes a single intravenous (IV) infusion of the study drug and consists of a screening period (4 weeks), a double-blind, placebo-controlled period (12 weeks), and a safety follow-up period (8 weeks). Participants confirmed eligible will be randomized (1:1:1) to receive a single IV infusion of either eptinezumab 300 milligrams (mg) dose (weight adjusted; targeting adult exposure after 300 mg IV), eptinezumab 100 mg (weight adjusted; targeting adult exposure after 100 mg IV), or placebo at randomization visit. The doses will be adjusted for the participant's body weight.
To find out if eptinezumab is better than placebo (normal saline solution) in lowering the number of days with migraine in young people ages 12 to 17 with chronic migraine.