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Friday
Oct152010

FDA Approves Botox as Migraine Preventive

Federal health authorities on Friday approved Botox injections for the prevention of chronic migraines in adults, an advance experts described as "modest."

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.

The drug, made by Allergan, Inc., of Irvine, California, was approved last month in Britain for the same purpose.

The two company-funded studies submitted to the FDA involved 1,384 adults from 122 study sites in Europe and North America. They found that after six months, patients who got the drug experienced 7.8 and 9.2 fewer days of migraine than they had before the studies started. Those who got injections of placebo (sugar pill) experienced 6.4 and 6.9 fewer headache days.

Over those six months, patients on the drug experienced 107 and 134 fewer hours of headache, versus a reduction of 70 and 95 hours for those on placebo, according to the studies.

The benefits are modest when you look at the overall results," said Dr. Elizabeth W. Loder, associate professor of neurology at Harvard Medical School and the chief of the division of headaches in the Department of Neurology at the Brigham and Women's Hospital in Boston. Loder was involved in an Allergan-funded trial several years ago but has no current relationship with the company.  "But, of course, within those results, there are always patients who do much better than the average and there are patients who don't have any benefit," she said.

Still, she added, "It will provide more options for patients who currently have very few forms of treatment available to them ... when you are dealing with a problem like this, even modest improvement can mean the difference between being able to go to work and not being able to function very well."

Dr. Joel Saper, director of the Michigan Head Pain and Neurological Institute and clinical professor of neurology at Michigan State University, said he has been using the drug for that purpose for more than a decade, even though it was not approved for it.

The FDA's approval will likely mean that insurance companies will pick up the tab for it now, he said. Saper, who has also participated in Allergan-funded trials, predicted "certain subsets of people will get dramatic results."

Click here for the complete article.

Reader Comments (3)

Does anyone of you use Botox to treat migraine? What are the recommended injection sites for optimum results?

Usually I ask my patients to show their pressure points on their heads. I only inject at least 3 units/site.

08.27 | Unregistered CommenterT. Dunmore

Couldn't agree more with T. Dunmore. Your injection site mainly depends on where your patients migraine originates. I usually inject on the obicularis oculi, frontalis procerus and corrugators.

09.6 | Unregistered Commenter79rebeck

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