Botox is an FDA-approved treatment for chronic migraines. If the migraines occur for 15 days or more in a month, then the person is a candidate for Botox migraine treatment injections. 

The Botox is injected around the pain fibers that cause headaches and enters the nerve endings. When injected it blocks the release of chemicals that are involved in pain transmission, preventing activation of the the pain networks in the brain. 

There are patients that reported 50% headaches reduction after just 2 treatments. 

Consistent Botox treatment can also prevent migraine headaches before they start.