A Study Evaluating Oral Atogepant for the Prevention of Migraine in Japanese Participants With Chronic or Episodic Migraine

The study recruited the following 2 cohorts: 3101-303-002 CM Completers: Japanese participants who completed lead-in Study 3101 303-002 (PROGRESS; NCT03855137), a Phase 3, multicenter, randomized, double-blind, placebo controlled, parallel-group study of atogepant for the prevention of CM. All 3101 303-002 CM Completers rolled over at Visit 7 (the end of the double-blind treatment period) of the lead-in study, which functioned as Visit 1 for this study, Study 3101-306-002. De Novo EM Participants: Japanese participants with EM who were newly recruited for this study at selected sites. Participation began with a 4-week Screening/Baseline period starting at Visit -1, and those who completed the 4-week Screening/Baseline period and met all entry criteria were enrolled into the 52-week open-label treatment period at Visit 1.