I've been on Topamax for years for migraine prevention 200mg 2x per day - just so happened that it was a great add on for my bipolar.
Be careful as you up the dosage as it tends to make you dopey and tired at first and as Yoda said it can mess with your words but that stuff went away for me. The stuff that tends to linger are tingling in hands and feet (once in a while).
It can also decrease your appetite at first.
I always upped the dosage on a weekend so I wouldn't have to go anywhere.