July 16, 2018 SAN FRANCISCO — OnabotulinumtoxinA (Botox, Allergan) treatment is more effective, is better tolerated, and has greater functional improvement in the prevention of chronic migraine compared with the anticonvulsant topiramate, new research suggests. The findings were presented here at the American Headache Society (AHS) Annual Meeting 2018. The AAN guidelines state: •OnabotulinumtoxinA is established as...