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Background Chronic migraine (CM) is a disabling type of primary headache for which treatment with botulinum toxin type A (BoNT-A) has proved to be effective and safe in reducing headache days and headache-related disability. However, little is known about factors influencing the response to BoNT-A. We aimed to assess which baseline factors predicted a favorable response to BoNT-A in a sample of patients with CM.

O059. Predictors of response to botulinum toxin for the treatment of chronic migraine: data from a Headache Center