I only take the one - Lamictal - because it seems like my Risperdal is good enough at keeping me from being manic that I don't really need another mood stabilizer. (I tried going off the Risperdal and became hypomanic almost immediately, so I think the stories about Lamictal not really being effective against mania probably have some truth to them.) Some people take more. I wouldn't really worry about it; the important part is whether or not that combination helps you.