I take two - Lithium and Depakote. They work synergistically, increasing the potency of one another. It works out real well for me. Depakote also diminishes the frequency of my migraines, a nice added positive side effect. At some point, I was taking three - Lamictal as well - but my current p-doc removed Lamictal after my first introductory visit with her. I do not miss Lamictal - it produced no positive effects, although no negative side effects either. I feel sad that for several years I was taking a med that I do not absolutely need.

To your question: Lamictal does little against the manic side, even though it is called a mood stabilizer. No wonder your p-doc wants to add another mood stabilizer that does work the manic side.