wellbutrin actually will not make you gain weight it may stabilize your weight or lose weight. it depends on the individual. i am on wellbutrin 300 mg and a mood stabilizer and am afraid i will gain weight with the mood med. i am keeping a close eye on all but you are safe with the welllbutrin.
The leaflet that comes with your medication should tell you the likelihood of gaining weight. You do not gain weight on a lot of anti-depressants. I have been on many. Not Wellbutrin, I confess. Hope you find it suits you. Effexor is the drug that seems to make many people gain weight.