Hi, all. I have been on Lamictal for a little over 4 years, at varying doses. I did notice memory loss and concentration issues when I upped the dose gradually to 400mg. I typically have a very solid memory and I definitely noticed issues. I've been on 200mg for some time now, and it seems to be OK, but I still have attention and memory issues from time to time. I also take a med for mild ADD as well, so that could be part of it, but I think the Lamictal is a big factor. However, I think it keeps me stable, so I will live with it. Hope this helps.