OnabotulinumtoxinA for Chronic Migraine


  • Andrew Blumenfeld MD,

  • Randolph W. Evans MD

  • Expert opinion by: Andrew Blumenfeld, MD, Director, The Headache Center of Southern California, 332 Santa Fe Drive, Encinitas, CA 92024, USA, email: blumenfeld@neurocenter.com

  • Case history by: Randolph W. Evans, MD, Baylor College of Medicine, 1200 Binz #1370, Houston, TX 77004, USA, email: rwevans@pol.net

  • Conflict of interest: Andrew Blumenfeld is a consultant and has received research grants from Allergan, Ipsen, and Mertz.