The U.S. Food and Drug Administration approved Botox injection (onabotulinumtoxinA) to prevent headaches in adult patients with chronic migraine. Chronic migraine is defined as having a history of migraine and experiencing a headache on most days of the month. "Chronic migraine is one of the most disabling forms of headache," said Russell Katz, M.D., director of the Division of Neurology Products in the FDA's Center for Drug Evaluation and Research. "Patients with chronic migraine experience a headache more than 14 days of the month...
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