Topamax is a popular drug for the prevention of migraine headaches.  IT works for about half of the patients who try it.  The main problem that makes people stop taking the drug is cognitive side effects.  Patients tell us that they feel “stupid” on this drug.  An article just published in the European Journal of Neurology pinpoints the main cognitive problem, which turns out to be word fluency.  This means having trouble coming up with the right word.