The participants who take part in this trial will be asked to stay in the trial for about a year. The participants will be asked to visit the trial site 7 times during the trial. In between trial site visits, they will have scheduled phone calls with the trial site staff. They will also be asked to keep track of their cluster headaches at home with a headache diary.
The main goal of this trial is to inform about long-term safety and tolerability of eptinezumab in participants with chronic cluster headache.