Federal health authorities on Friday approved Botox injections for the prevention of chronic migraines in adults.
In a statement, the Food and Drug Administration recommended Botox be injected approximately every three months around the head and neck to dull future headache symptoms.
The drug - whose generic name is onabotulinumtoxinA - has not been shown to work against migraines that occur 14 days or fewer per month, nor has it been shown to work for other forms of headache, said the statement.
Experiencing a migraine on most days "is one of the most disabling forms of headache," said Dr. Russell Katz, of the Division of Neurology Products in the FDA's Center for Drug Evaluation and Research. "This condition can greatly affect family, work, and social life, so it is important to have a variety of effective treatment options available."
Migraines, an intense pulsing or throbbing pain in one area of the head, are often accompanied by nausea, vomiting and sensitivity to light and sound, doctors say. Chronic migraines are defined as those that occur on 15 days or more for more than four hours per day.