I do not have a chronic daily headache anymore, I used to have a non-stop headache and now, on the
topamax, I have many pain-free moments
and I only have to deal with a LOT of acute
migraines, usually at least one migraine a day still. So, I can't really say if the topamax has helped with my chronic migraines or not... but, I believe it can be a very useful medication for preventing chronic pain.
As for side-effects...