Rimegepant

Change from the Observation Phase in the number of monthly migraine days (MMDs) over the 12-week Double-Blind Treatment Phase. Monthly migraine days will be assessed using participant-reported electronic diary data.

Change from Observation Period in the number of migraine days per the 5-day perimenstrual period

Efficacy of rimegepant relative to placebo, measured as mean change from the baseline in the number of migraine days per month

A migraine day(MD) was defined as any calendar day participant experienced a qualified migraine headache (onset,continuation,or recurrence), per electronic diary(eDiary). A qualified migraine headache was defined as a migraine with/without aura,lasted for \>=30 minutes with \>=2 pain features (unilateral location,pulsating quality\[throbbing\],moderate/severe pain intensity,aggravated by or caused avoidance of routine physical activity \[e.g. walking/climbing stairs\]) and/or with \>=1 of the following associated symptoms (nausea and/or vomiting, both photophobia and phonophobia).The number(no.) of md per month (m) was prorated to 28 days and derived as:OP:28\*\[total no.of MD in OP analysis period\]/(total no.of efficacy data day in OP analysis period), monthly (4-week interval) on-DBT efficacy analysis period: 28\*(total no.of MD in m)/(total no. of efficacy data days in m),overall DBT in on-DBT efficacy analysis period:28\*(total no.of MD through m3)/(total no.of efficacy data day through m3).

Pain freedom at 2 hours post-dose was defined as having a pain intensity of none at that time point. Pain was measured on a 4-point Likert scale, with following scores: 0= none, 1= mild, 2= moderate, 3= severe. Participants with score of 0 (no pain) were considered to have freedom from pain. Formal statistical hypothesis testing was planned only for rimegepant 75 mg group with controlling type 1 error by the prespecified hierarchical gate-keeping procedure. For rimegepant 25 mg, no formal statistical hypothesis testing was conducted for any outcome measures as pre-specified in Statistical Analysis Plan (SAP).

Migraine day: 1) day of electronic diary (eDiary) efficacy data with a qualified migraine headache, defined as: Headache lasted for \>= 30 minutes and had 2 or more of following pain features: Unilateral and pulsating, moderate or severe pain intensity, worsen or avoid physical activity with one or more of the following associated symptoms: nausea, vomiting, both photophobia and phonophobia or 2) Acute migraine-specific medication day as eDiary efficacy data with a "yes" response to either of the 2 questions about taking triptan or ergotamine to treat headache or non-scheduled OL Rimegepant dosing day. The number of migraine days per month were prorated to 28 days and derived for month (i.e., 4-week interval) in on-DBT efficacy analysis period as follows: 28\*(total number of migraine days in month \[Week 9 to 12\])/ (total number of efficacy data days in month \[Week 9 to 12\]).

Reduction from baseline in mean number of migraine days per month

To evaluate the safety and tolerability of rimegepant in children and adolescents (6 to \< 18 years of age).

MBS included nausea, phonophobia or photophobia. MBS were measured using a binary scale as 0= absent, 1= present. Participants who had score of 0 (MBS absent) were considered to have freedom from MBS. Exact 95% CI was based on Clopper-Pearson method.

Pain levels were assessed on a 4-point scale (none, mild, moderate, severe) using the electronic diary (eDiary). Pain freedom was defined as pain level of none.

MBS was reported as nausea, photophobia, or phonophobia at migraine onset using the eDiary. Symptom status (absent, present) was assessed post-dose using the eDiary separately for nausea, photophobia, and phonophobia. Freedom from MBS was defined as MBS reported at onset that was absent post-dose.

A migraine day: any calendar day in which the participant experienced a qualified migraine headache (onset, continuation, or recurrence of the migraine headache). A qualified migraine headache: a migraine with or without aura, lasting for ≥30 minutes, and meeting at least 1 of the following criteria (a and/or b): a) ≥2 of the following: unilateral location, pulsating quality, moderate to severe pain intensity, aggravation by or causing avoidance of routine physical activity; b) ≥1 of the following: nausea and/or vomiting, photophobia, and phonophobia. If the participant took a migraine-specific medication during aura or to treat headache on a calendar day, it was counted as a migraine day regardless of the duration and pain features/associated symptoms. Months were defined as 28-day intervals. The change from baseline was calculated as the number of monthly migraine days during the last 4 weeks of the DBT phase (Weeks 9 to 12) minus number of monthly migraine days during the OP.

An AE was defined as any new untoward medical occurrence or worsening of a pre-existing medical condition on-treatment in a patient or clinical investigation participant administered an investigational (medicinal) product and that did not necessarily have a causal relationship with this treatment. An SAE was defined as any event that met any of the following criteria: death; life-threatening; inpatient hospitalization or prolongation of existing hospitalization; persistent or significant disability/incapacity; congenital anomaly/birth defect in the offspring of a participant who received rimegepant; other important medical events that may not have resulted in death, be life-threatening, or required hospitalization, based upon appropriate medical judgment, they may have jeopardized the participant and may have required medical or surgical intervention.

Clinically significant laboratory abnormalities were defined as Grade 3 to 4 on-treatment laboratory test results according to numeric laboratory test criteria found in Common Technical Criteria for Adverse Events (CTCAE) Version 5.0 (2017) if available; otherwise, according to Division of Acquired Immune Deficiency Syndrome (DAIDS) Table for Grading the Severity of Adult and Pediatric Adverse Events Corrected Version 2.1 (2017) for Glucose, LDL-Cholesterol, Uric Acid, and Urinalysis. Laboratory test groups of clinical interest included hematology, serum chemistry, and urinalysis. Participants must have had a non-missing measurement in the on-treatment period to be included for a given parameter.

Pain freedom was defined as participants reporting a value of "none" on the four-point numeric rating scale (none=0, mild =1, moderate =2, severe =3) from baseline. Participants with baseline moderate pain or severe pain were included in the analysis.

Evaluate the effectiveness of rimegepant 75 mg ODT or zavegepant 10 mg nasal spray as acute migraine treatments administered during ED encounters • Percentage of participants with pain relief of "mild" or "none" on a 4-point scale (none, mild, moderate, severe) at 2 hours post-study drug administration, without rescue medication