Efficacy and Safety Study of Rimegepant for the Acute Treatment of Migraine in Japanese Subjects (Japan Only)

Prior treatment

• History of use of analgesics (e.g. nonsteroidal anti-inflammatory drugs \[NSAIDs\] or acetaminophen) on ≥ 15 days per month during the 3 months (12 weeks) prior to the Screening Visit.
• Subject history with current evidence of uncontrolled, unstable or recently diagnosed cardiovascular disease, such as ischemic heart disease, coronary artery vasospasm, and cerebral ischemia. Subjects with Myocardial Infarction (MI), Acute Coronary Syndrome (ACS), Percutaneous Coronary Intervention (PCI), cardiac surgery, stroke or transient ischemic attack (TIA) during the 6 months prior to screening.
• Uncontrolled hypertension or uncontrolled diabetes (however subjects can be included who have stable hypertension and/or diabetes for at least 3 months prior to screening).

Other illness

• Subject has a history of migraine with brainstem aura (basilar migraine), hemiplegic migraine or retinal migraine.
• Subject with other pain syndromes, psychiatric conditions, dementia, or significant neurological disorders (other than migraine) that, in the Investigator's opinion, interfere with study assessments.
• Subject has a history of gastric, or small intestinal surgery (including Gastric Bypass, Gastric Banding, Gastric Sleeve, Gastric Balloon, etc.), or has a disease that causes malabsorption.
• The subject has a history or current evidence of any unstable medical conditions (e.g., history of congenital heart disease or arrhythmia, known or suspected infection, hepatitis B or C, or cancer) that, in the investigator's opinion, would expose them to undue risk of a significant adverse event (AE) or interfere with assessments of safety or efficacy during the course of the trial.
• History of alcohol abuse and/or illicit drug use meeting DSM-V criteria for substance use disorder within 6 months of screening.

Other

• Participation in any other investigational clinical trial while participating in this clinical trial.

• Subject has at least 1 year history of migraines (with or without aura), consistent with a diagnosis according to the International Classification of Headache Disorder, 3rd Edition, including the following:
• Migraine attacks present for more than 1 year with the age of onset prior to 50 years of age.
• Migraine attacks, on average, lasting about 4-72 hours if untreated.
• Not more than 8 attacks of moderate to severe intensity per month within the last 3 months.
• Ability to distinguish migraine attacks from tension/cluster headaches.
• Consistent migraine headaches of at least 2 migraine headache attacks of moderate or severe intensity in each of the 3 months prior to Screening Visit and maintains this requirement during the Screening period.
• Less than 15 days with headache (migraine or non-migraine) per month in each of the 3 months prior to Screening Visit and maintains this requirement during the Screening Period.
• Subjects on prophylactic migraine medication are permitted to remain on therapy if the dose has been stable for at least 3 months prior to the Screening Visit, and if the dose is not expected to change during the course of the study.
• Subjects with contraindications for use of triptans may be included provided they meet all other study entry criteria.