Does Wellbutrin cause weight loss?

That is true

I'm currently on it and I lost a good amount of weight

I only took it for a week or two. Gave me headaches so I switched to Cymbalta

Yes it's true I took it for awhile and I lost weight on it

I have not gained weight using it.

I was on it for a short time bc it gave me hives all over my body & face, but it didn't make me gain weight

Not true in my case.