A Study With Eptinezumab in Children and Adolescents (6 to 17 Years) With Chronic or Episodic Migraine

Inclusion Criteria:

- The participant must have completed Week12 (completion) visit of either Study19356A (CM) or Study19357A (EM) immediately prior to enrolment into this OLE study.

Exclusion Criteria:

• The participant has an adverse event or other safety concerns that are deemed related to double-blind treatment received in the lead-in study and is considered a potential safety risk by the investigator.
• During lead-in Study19356A or Study19357A:
• participant experienced ananaphylactic reaction or another severe and/or serious hypersensitivity reaction to the investigational medicinal product (IMP) infusion, as assessed by the investigator
• the participant had a serum alanine aminotransferase (ALT) or aspartate aminotransferase(AST) value >5 times the upper limit of the reference range that was confirmed by testing <2 weeks later.
• the participant had a serum ALT or AST value >3times the upper limit of the reference range and a serum total bilirubin value >2times the upper limit of the reference range.