- NEW YORK : The main ingredient in Botox may be modestly helpful for people with chronic migraines, a new report suggests — but it doesn’t seem to offer much relief for those who have less-frequent headaches.
Patients who started out having headaches almost every day reported two fewer headaches per month when they were given injections of botulinum toxin A. But they also had more side effects, including weak muscles and stiff necks.