When I was on Lamictal (lamotrigine) I had issues with being able to find the right words to the simplest things.

An example would be that when I was on vacation, I saw a beaver on the side of the road. I tried to tell my mom about the beaver but I couldn't recall the word "beaver". My mind searched other terms (rat, dog, cat, etc) but I knew they weren't the right word.

It wasn't terrible in that it affected my everyday life to the point I would stop taking the meds.