Secondary Outcome(s)
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DB Period: Number of Participants With Adverse Events (AEs) and Who Did Not Complete the Study Due to AEs
[Time Frame: Baseline (Day 0) up to Week 12]
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DB Period: Number of Participants With Potentially Clinically Significant Abnormal Urinalysis Laboratory Tests Results
[Time Frame: Baseline up to Week 12]
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DB Period: Number of Participants With Shift From Baseline to Week 12 in Electrocardiogram (ECG) Parameters
[Time Frame: Baseline, Week 12]
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DB Period: Number of Participants With Potentially Clinically Significant Abnormal Coagulation Laboratory Test Results
[Time Frame: Baseline up to Week 12]
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DB Period: Change From Baseline in Monthly Average Number of Headache Days of at Least Moderate Severity During the 4-Week Period After the First Dose of Fremanezumab
[Time Frame: Baseline (Day -28 to Day -1), up to Week 4]
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DB Period: Number of Participants With Potentially Clinically Significant Abnormal Vital Signs Values
[Time Frame: Baseline up to Week 12]
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DB Period: Change From Baseline in Monthly Average Number of Headache Days of at Least Moderate Severity During the 12-Week Period After the First Dose of Fremanezumab
[Time Frame: Baseline (Day -28 to Day -1), up to Week 12]
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DB Period: Change From Baseline in Monthly Average Number of Days of Use of Any Acute Headache Medications During the 12-Week Period After the First Dose of Fremanezumab
[Time Frame: Baseline (Day -28 to Day -1), up to Week 12]
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OL Period: Number of Participants With AEs and Who Did Not Complete the Study Due to AEs
[Time Frame: Week 12 up to Week 24]
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DB Period: Number of Participants Who Received Concomitant Medications for Adverse Events
[Time Frame: Baseline up to Week 12]
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OL Period: Number of Participants With Potentially Clinically Significant Abnormal Coagulation Laboratory Test Results
[Time Frame: Week 12 up to Week 24]
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DB Period: Number of Participants With Potentially Clinically Significant Abnormal Serum Chemistry Results
[Time Frame: Baseline up to Week 12]
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OL Period: Number of Participants With Potentially Clinically Significant Abnormal Urinalysis Laboratory Tests Results
[Time Frame: Week 12 up to Week 24]
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DB Period: Change From Baseline in Monthly Average Number of Migraine Days During the 4-Week Period After the First Dose of Fremanezumab
[Time Frame: Baseline (Day -28 to Day -1), up to Week 4]
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DB Period: Number of Participants With Potentially Clinically Significant Abnormal Hematology Results
[Time Frame: Baseline up to Week 12]
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OL Period: Number of Participants Who Received Concomitant Medications for Adverse Events
[Time Frame: Week 12 up to Week 24]
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OL Period: Number of Participants With Potentially Clinically Significant Abnormal Hematology Results
[Time Frame: Week 12 up to Week 24]
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OL Period: Number of Participants With Potentially Clinically Significant Abnormal Serum Chemistry Results
[Time Frame: Week 12 up to Week 24]
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OL Period: Number of Participants With Shift From Baseline to Week 24 in ECG Parameters
[Time Frame: Baseline, Week 24]
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DB Period: Percentage of Participants Reaching at Least 50 Percent (%) Reduction From Baseline in Monthly Average Number of Migraine Days During the 12-Week Period After the First Dose of Fremanezumab
[Time Frame: Baseline (Day -28 to Day-1), up to Week 12]
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DB Period: Percentage of Participants Reaching at Least 50% Reduction From Baseline in Monthly Average Number of Migraine Days During the 4-Week Period After the First Dose of Fremanezumab
[Time Frame: Baseline (Day -28 to Day-1), up to Week 4]
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OL Period: Number of Participants With Potentially Clinically Significant Abnormal Vital Signs Values
[Time Frame: Week 12 up to Week 24]
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