I posted this on another thread, but I'll repost it here, too.

The only side effect I had on Lamictal (Lamotrigine) was that I found I had difficulty finding the right words. For example, on vacation, I saw a beaver on the side of the road, but when I was searching for the word "beaver", all I could come up with was "dog", "rat", "cat", etc.

It wasn't bothersome enough to stop the med because of it, but it was noticeable. I was on 200mg I believe.

Also, I wasn't sure about whether or not it was working (I was on other meds at the time), but when we increased it, we noticed an effect on my mood charting about 6-8 weeks later. So, for me, it took awhile to be helpful.