I did fine on 100 mg. I'm on 150 mg now and I didn't even really need to change. I'm not going up unless I have further bad episodes. A note, though, a am currently taking the brand name Lamictal and have had serious problems (as in it didn't work at all and I became psychotic and suicidal) with the generic. But anyway, about doses--we're all different. Don't keep going up and up and up unless you need to. The docs like to get people up to "maintenance" doses, but in my experience much less often works. Why take so much when you can increase as needed and probably extend the efficacy of the medication and its functionality in the brain?

Also, on the brand name Lamictal I have zero side effects. My appetite is generally lower but that could be stress, the Wellbutrin combined with it, or really anything. But yeah, no side effects at all.