depression
"I've been on 100mg Lamotrigine for 9 years now. I started it after a major depressive episode. No side effects that I can tell, which is a huge boon compared to SSRIs (weight gain, feeling hungry all the time, and no libido) and Welbutrin made me feel like I was on speed. It is a mood stabilizer, not so much an AD. I went from having anxious and depressed episodes every few weeks to having them rarely. After a few years I tried upping my dosage to 200mg, but I felt too 'flat' emotionally and went back to 100. I still feel some depression, but the cycling is greatly reduced. Really a miracle drug for me.  I recommend titrating up (and down) very slowly, to avoid getting the rash.  It takes a while , but it was so worth it for me."