Clinical Trials

Inclusion Criteria:

• Diagnosis of migraine at ≤ 35 years of age with history of chronic migraine ≥ 1 year
• During the 28 day screening period, must have ≥ 15 headache days of which ≥ 8 days were assessed as migraine days with at least 5 migraine attacks as recorded in the eDiary
• Headache eDiary was completed on at least 22 of the 28 days prior to randomization

Exclusion Criteria:

• Confounding pain syndromes (e.g. fibromyalgia, chronic low back pain, complex regional pain syndrome) or any pain syndrome that requires regular analgesia
• Psychiatric conditions that are uncontrolled and untreated, including conditions that are not controlled for a minimum of 6 months prior to screening.
• History or diagnosis of complicated migraine (ICHD-III beta version, 2013), chronic tension-type headache, hypnic headache, cluster headache, hemicrania continua, new daily persistent headache, migraine with brainstem aura, sporadic and familial hemiplegic migraine
• Unable to differentiate migraine from other headaches
• Subject has received botulinum toxin for migraine or for any other medical/cosmetic reasons requiring injections in the head, face, or neck within 6 months prior to screening.
• Have any clinically significant concurrent medical condition
• Receipt of any monoclonal antibody treatment within 6 months of screening (within or outside a clinical trial)
• Previously dosed with ALD403 or any monoclonal antibody targeting the CGRP pathway