A Study to Learn About the Safety of Taking an Additional Dose of the Medicine Rimegepant in Adults With Migraine

A PHASE 4, SINGLE-ARM, OPEN-LABEL STUDY TO EVALUATE THE SAFETY, TOLERABILITY AND EFFECTIVENESS OF REDOSING OF RIMEGEPANT IN PARTICIPANTS 18 YEARS OF AGE OR OLDER FOR THE ACUTE TREATMENT OF MIGRAINE

Acute treatments for migraine may not provide sufficient pain relief after an initial dose, and a second dose of a given medication may be needed to fully abort an attack. International Headache Society (IHS) global practice recommendations for the Acute Treatment of Migraine suggest a second dose of the same medication within the recommended dose limit in people with headache relapse after successful initial treatment of a migraine attack.

The primary purpose of this study is to evaluate the safety and tolerability of redosing of rimegepant when taken for the acute treatment of a migraine attack, as it is possible that some patients may benefit from a second dose of rimegepant in this setting.

Study Overview

• Status: Not yet recruiting
• Conditions: Acute Treatment of Migraine
• Intervention / Treatment: Drug: Rimegepant

Detailed Description

To evaluate the safety and tolerability of rimegepant 75 mg ODT when redosed due to residual pain or headache relapse

• Study Type: Interventional
• Enrollment (Estimated): 400
• Phase: Phase 4

Contacts and Locations

• Study Contact: Name: Pfizer CT.gov Call Center; Phone Number: 1-800-718-1021; Email: ClinicalTrials.gov_Inquiries@pfizer.com

Study Locations

• United States
  • Florida
    • Boca Raton, Florida, United States, 33428
      • Neurology Offices of South Florida

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: Adult; Older Adult
• Accepts Healthy Volunteers: No

Description

Inclusion:

• Eligible participants include adult participants aged 18 years of age or older with a minimum 1-year history of migraine (with or without aura) consistent with International Classification of Headache Disorders, 3rd Edition
• Eligible participants must be currently using acute migraine treatment in accordance with the local label and have all of the following on average across the 12 weeks prior to the Screening Visit and, during the first 28 days of the observation phase (OP): (1) 6-14 monthly migraine days (MMDs); (2) <15 monthly headache days (MHDs) (migraine or non-migraine); and (3) <7 monthly non-migraine headache days.

Exclusion:

• Participants with headaches occurring ≥15 days per month (migraine or non-migraine) on average across the 12 weeks prior to the Screening Visit and ≥7 non-migraine headache days per month on average across the 12 weeks prior to the Screening Visit would not be eligible.

Study Plan

How is the study designed?

Design Details

• Primary Purpose: Treatment
• Allocation: Non-Randomized
• Interventional Model: Single Group Assignment
• Masking: None (Open Label)

Number of Arms

1

Arms and Interventions

Participant Group / Arm

Intervention / Treatment

Experimental: Rimegepant; Participants will receive rimegepant 75 mg ODT to administer for the acute treatment of migraine attacks of moderate or severe headache pain intensity. A second rimegepant 75 mg ODT should be taken in the event that participants are not pain free at approximately 2 hours post initial dose OR upon headache relapse after initial pain freedom. The second dose should be taken within 24 hours of the initial dose. Participants will receive rimegepant over a 24 week period during the OLT phase. Participants may redose with rimegepant up to a maximum of 10 times per month (28 days) during the OLT phase.

Drug: Rimegepant; Rimegepant

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Time Frame
Incidence of Treatment-Emergent Adverse Events (TEAEs), serious TEAEs, and TEAEs leading to study intervention discontinuation on treatment by average monthly redosing frequency over the entire OLT phase (<3, ≥3 to <6, ≥6 re-doses per month) and overall	Up to 6 months
Incidence of LFT elevations, AST >3x ULN, alanine aminotransferase ALT >3x ULN, and total bilirubin >2x ULN on treatment by average monthly redosing frequency over the entire OLT phase (<3, ≥3 to <6, ≥6 re-doses per month) and overall	Up to 6 months

Secondary Outcome Measures

Outcome Measure	Time Frame
Percentage of rimegepant-redosed headache days with satisfaction with headache pain reduction over the entire OLT phase, based on a rating of 'Extremely satisfied' or 'Satisfied' for satisfaction with study intervention to reduce headache pain	Up to 6 months
Percentage of rimegepant-redosed headache days with reduced impact on daily activities over the entire OLT phase, based on a rating of 'Very good' or 'Good' for the ability of study intervention to reduce the impact of headaches on daily activities	Up to 6 months

Collaborators and Investigators

• Sponsor: Pfizer
• Investigators: Study Director: Pfizer CT.gov Call Center, Pfizer

Publications and helpful links

Helpful Links

• To obtain contact information for a study center near you, click here.

Study record dates

Study Major Dates

• Study Start (Estimated): May 27, 2026
• Primary Completion (Estimated): May 14, 2028
• Study Completion (Estimated): May 14, 2028

Study Registration Dates

• First Submitted: May 20, 2026
• First Submitted That Met QC Criteria: May 20, 2026
• First Posted (Actual): May 27, 2026

Study Record Updates

• Last Update Posted (Actual): May 27, 2026
• Last Update Submitted That Met QC Criteria: May 20, 2026
• Last Verified: May 1, 2026

More Information

Terms related to this study

• Additional Relevant MeSH Terms: rimegepant sulfate
• Other Study ID Numbers: C4951086

Plan for Individual participant data (IPD)

• Plan to Share Individual Participant Data (IPD)?: YES
• IPD Plan Description: 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.

Drug and device information, study documents

• Studies a U.S. FDA-regulated drug product: Yes
• Studies a U.S. FDA-regulated device product: No