A Long-Term Safety and Tolerability Extension Study Evaluating Atogepant for the Prevention of Chronic or Episodic Migraine

Percentage of Participants with Clinically Significant Laboratory Values (Chemistry, Hematology, Urinalysis) as assessed by the Investigator

Time frame: 156 weeks

Percentage of Participants with Clinically Significant Electrocardiograms (ECGs) Findings as assessed by the Investigator

Time frame: 156 weeks

Percentage of Participants with Clinically Significant Vital Sign Measurements as assessed by the Investigator

Time frame: 156 weeks

Columbia-Suicide Severity Rating Scale (C-SSRS) Assessing Suicidal Ideation and Behaviour using 5-Point Scales

A clinician-rated instrument that reports the severity of both suicidal ideation and behavior. Suicidal ideation is classified on a 5-item scale: 1 (wish to be dead), 2 (nonspecific active suicidal thoughts), 3 (active suicidal ideation with any methods \[not plan\] without intent to act), 4 (active suicidal ideation with some intent to act, without specific plan), and 5 (active suicidal ideation with specific plan and intent). Suicidal behavior is classified on a 5-item scale: 0 (no suicidal behavior), 1 (preparatory acts or behavior), 2 (aborted attempt), 3 (interrupted attempt), and 4 (actual attempt). More than 1 classification can be selected provided they represent separate episodes. (Minimum total score 0, maximum total score 5; higher total scores indicate more suicidal ideation and/or suicidal behavior)

Time frame: 156 weeks