migraine prevention
"My doctor prescribed me Topamax as a preventative measure for my common migraines.  It helped with my headaches really well.  I used to get migraines at least a dozen times a month and this medicine allowed me to only have 2 headaches in the month that I took it.  
I stopped taking it, however, because I felt so out of it.  I felt like a space cadet.  It also made me very moody.  Everything irritated and bothered me.  I didn't think those feelings were worth continuing with the prescription.  
I would suggest trying it, as those effects, from what I understand, are rare.  And, I have to say that I didn't get migraines for a few months after I stopped taking it.  So that was a bonus.  
As a side note, it does make soft drinks taste 'flat'."