Extension Study to Evaluate the Long-Term Safety and Tolerability of Oral Atogepant for the Prevention of Migraine in Participants With Episodic Migraine

Inclusion Criteria: * Written informed consent and participant privacy information (eg, written authorization for use and release of health and research study information) obtained from the participant prior to initiation of any study-specific procedures. * Participants must be using a medically acceptable and effective method of birth control during the course of the entire study. * Eligible participants who completed the double-blind treatment period (Visit 7) and the follow-up period (Visit 8), if applicable, depending on the timing of study initiation, of Study 3101-301-002 (NCT03777059) without significant protocol deviations (eg, noncompliance to protocol-required procedures). Exclusion Criteria: * Female participant is pregnant, planning to become pregnant during the course of the study, or currently lactating. Women of childbearing potential must have a negative urine pregnancy test at Visit 1. * Hypertension as defined by sitting systolic BP \> 160 mm Hg or sitting diastolic BP \> 100 mm Hg at Visit 1. * Participants with clinically significant hematologic, endocrine, cardiovascular, pulmonary, renal, hepatic, gastrointestinal, or neurologic disease.