Wellbutrin is more likely to cause appetite loss not weight gain. That's one reason I stopped taking it. That and I couldn't sleep or even want to sleep most nights and I was sick of being medicted. In Canada we don't have a generic Wellbutrin XL but a months supply of brand is about 50 so, not too bad money wise. Only brand drug i ever took. Much cheaper than smoking even if she's adding a mood stabilizer. Of course, I haven't a clue what it runs in the US.