A migraine is a moderate to severe headache on one side of the head. A migraine attack is a headache that may be accompanied by throbbing, nausea, vomiting, sensitivity to light and sound, or other symptoms. A number of treatments are available for adults with migraine but there are limited approved treatments available for pediatric participants. The main goal of the study is to evaluate the safety and efficacy (how well treatment works) of a low-dose and high-dose of atogepant in pediatric participants between the ages of 6 and 17. Atogepant is a medicine currently approved to treat adults with migraine (0 to 14 migraine days per month) and is being studied in pediatric participants between the ages of 6 and 17 with a history of episodic migraine. This is a Phase 3, randomized, double-blind study of atogepant in participants with a history of episodic migraine with an open-label pharmacokinetic substudy. Eligible participants will be randomized into 6 different groups. Participants between the ages of 12 and 17 will be randomized to receive placebo, low-dose atogepant, or high-dose atogepant for 12 weeks. Participants between the ages of 6 and 11 will also be randomized to receive placebo, low-dose atogepant, or high-dose atogepant for 12 weeks. The specific atogepant doses to be used in participants between the ages of 6 and 11 will be determined after the PK substudy is complete. Around 450 participants will be enrolled in approximately 100 sites worldwide. Placebo, low-dose atogepant, and high-dose atogepant are given as a tablet to take by mouth once a day. At the end of Week 12, participants will either undergo a follow-up visit 4 weeks after last study treatment or join an extension study where they can continue to receive atogepant for another 52 weeks. There may be a bigger responsibility for participants in this study. Participants will attend regular visits during the study at a hospital or clinic. The effects of treatment will be checked by medical assessments, blood tests, checking for side effects, and completing questionnaires.
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Change from Baseline in Mean Monthly Migraine Days
Timeframe: Baseline (Week 0) through Week 12
Number of Participants Experiencing Adverse Events
Timeframe: Baseline (Week 0) through Week 16