The purpose of this study is to evaluate the efficacy and safety of rimegepant when administered during the peri-menstrual period (PMP) for intermittent prevention of migraine in women who experience menstrual migraine attacks.

Inclusion Criteria:

1. Participant has regular menstrual cycles ≥24 days and ≤34 days
2. A minimum 1-year history of migraine (with or without aura) consistent with a diagnosis according to the International Classification of Headache Disorders, 3rd Edition
3. A history of menstrual migraine attacks of at least 3 months
4. Participant reported history of experiencing at least 1 migraine attack during the perimenstrual period in at least 2 out of 3 menstrual cycles immediately prior to screening.
5. If the participant is receiving a permitted background continuous prophylactic migraine medication, the medication dose must be stable for at least 3 months prior to the Screening visit and, the dose is not expected to change during the course of the study

Exclusion Criteria:

1. Greater than 6 migraine days per month that are outside of the perimenstrual period in the 3 months prior to Screening
2. A diagnosis of chronic migraine or a history of more than 14 headache days per month on average, in the 3 months prior to Screening
3. History of retinal migraine, basilar migraine or hemiplegic migraine
4. Current diagnosis of schizophrenia, bipolar, or borderline personality disorder
5. Other pain syndromes (eg, fibromyalgia, complex regional pain syndrome), or significant neurological disorders (other than migraine), or other medical conditions (including endocrine and gynecological eg, severe dysmenorrhea

Pfizer will provide access to individual de-identified participant data and related study documents (e.g. protocol, Statistical Analysis Plan (SAP), Clinical Study Report (CSR)) upon request from qualified researchers, and subject to certain criteria, conditions, and exceptions. Further details on Pfizer's data sharing criteria and process for requesting access can be found at: https://www.pfizer.com/science/clinical\_trials/trial\_data\_and\_results/data\_requests.