Migraine is characterized by attacks of throbbing, moderate or severe headache, associated with nausea, vomiting, and/or sensitivity to light and sound. The main objective of the study is to evaluate how safe and effective the atogepant is in preventing chronic migraine in adult Chinese participants who completed study 3101-303-002. Adverse events will be monitored.

Atogepant is an investigational drug being developed to prevent chronic migraine. All participants will receive the same treatment. Approximately 120 adult participants who completed study 3101-303-002 will be enrolled at approximately 25 centers in China.

All participants will receive atogepant oral tablet once daily for 12 weeks.

There may be higher treatment burden for participants in this trial compared to their standard of care. Participants will attend regular visits during the study at a hospital or clinic. The effect of the treatment will be checked by medical assessments, blood tests, checking for side effects and completing questionnaires.

Inclusion Criteria:

• Eligible participants completed the double-blind treatment period, and the safety follow-up period, if applicable, depending on the timing of study initiation, of Study 3101-303-002 without significant protocol deviations and who did not experience an adverse event (AE) that, in the investigator's opinion, may indicate an unacceptable safety risk.

Exclusion Criteria:

• Participants requiring any medication, diet, or nonpharmacological treatment on the list of prohibited concomitant medications or treatments, that cannot be discontinued or switched to an allowable alternative. Concomitant medications with demonstrated efficacy for the prevention of migraine is exclusionary, except that participants from lead-in study 3101-303-002 taking 1 medication with demonstrated efficacy for the prevention of migraine may participate in the current study provided that the dose was stable prior to the lead-in study and the participant is willing to continue taking that medication.
• Participants with an electrocardiogram (ECG) indicating clinically significant abnormalities at Visit 1.
• Participants with hypertension (sitting systolic blood pressure (BP) > 160 mm Hg or sitting diastolic BP > 100 mm Hg) at Visit 1.
• Participants with a significant risk of self-harm Columbia-Suicide Severity Rating Scale (C-SSRS), or of harm to others (investigator opinion); participants who report suicidal ideation with intent, with or without a plan, since the last visit, must be excluded.
• Participants with clinically significant hematologic, endocrine, cardiovascular, pulmonary, renal, hepatic, gastrointestinal, or neurologic disease.

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Access to this clinical trial data can be requested by any qualified researchers who engage in rigorous, independent scientific research, and will be provided following review and approval of a research proposal and Statistical Analysis Plan (SAP) and execution of a Data Use Agreement (DUA). For more information on the process, or to submit a request, visit the following link.