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Study: Botox may not be best for migraines

February 9, 2011 12:00:00 AM PST
A new study raises concerns about Botox being used to treat migraine headaches.

The use of Botox to treat chronic migraines is authorized in the U.S., but the British journal Drug and Therapeutics Bulletin says clinical trials show only "limited evidence of benefit."

It also says as many as 10 percent of volunteers reported painful side effects, including muscle spasms, rashes and itching.

The treatment involves regular injections in as many as 39 sites in the head and neck muscles.