The nerves it calms are tied to the Fibronyalgia as well as what causes the migraines for me.
The migraines I get started about five years after I was diagnosed with Fibro. I started on 25mg of Imitrex and over the past 20 years have been increased to 100mg. Now on Topamax almost a month (started it on July 11) the migraines are becoming much milder. I have different triggers, stress being one and the other is the nerve on the right side of my neck that goes down my back.