seizures
"I was on this for 4 1/2 years, right up to a very high dose.  I got the side effect of constantly feeling hungry yet never feeling full, no matter how much I ate.  That immediately caused me to gain 10 lbs. a month for 6 months:  60 pounds!  It also gave me the side effects of major depression and a generally unpleasant mood overall.  

It was of the usual average effectiveness in controlling my seizures, which began due to neurological brain damage in a traffic accident.

Note:  This medication is highlyY dangerous to pregnant women.  It will cause permanent damage to their fetus."