Therapy for Migraine Prevention in Children 6-11 Years of Age

Inclusion Criteria: * Otherwise, healthy male or female (6 to 11 years of age at the time of screening) with a history of migraine with or without aura for at least 6 months prior to screening, 3-12 migraine episodes and no more than 14 headache days (migraine and non-migraine) per month during the 3 months prior to Screening and during the 28-day Prospective Baseline Period, a PedMIDAS Disability score of ≥20 and ≤139 and weight at least 20 kg and no more than 60 kg. Exclusion Criteria: * Subjects with chronic migraine (\>14 headache days per month), cluster headaches, or migraine aura without headache and who are unable to distinguish migraines from other headache types. * Subjects with more than 14 headache days during the 28-day Prospective Baseline Period * Have taken any disallowed migraine preventive medication including TPM within 14 days prior to the start of the Prospective Baseline Period; or used onabotulinumtoxinA (Botox®) within 3 months prior to Screening. * Failure to respond to topiramate prophylaxis therapy (2 to 3 mg/kg/day) for a minimum of 3 months, or those who have previously discontinued TPM due to AEs within 6 months prior to Screening. * Failure to more than 2 adequate clinical trials of an established prophylactic antimigraine regimen within 6 months prior to Screening. * Current use of antipsychotics, antimanics, barbiturates, benzodiazepines amitriptyline, lithium, valproic acid, tricyclic antidepressants, AEDs, calcium channel blockers, sedati…