what is the best anti depressant that not cause weight gain?

what is the best anti depressant that not cause weight gain?I am living in UK, here doctors don't prescribe wellbutrine for depression (as its not licence), there is only Zyban which is indicated for smoking cessation. I am wondering what anti depression is out there that not causing weight gain.
I am in the process of buying Zyban (not wellbutrine, although they aresame active ingredient) from friend and take it with out dr prescription. I know its wrong but being that depress is not fun :-(
I am 31 years old mum and I can't waste time to be depress. what is people thought and exprience, please help me.
I am looking for real answer, not advertising your products, I know excerise help, but I have a clinical depression,

Kryptonian
The best anti-depressant that doesn't cause weight gain or any side-effects is exercise.

Try a half hour of jogging in the morning and then some weight training or swimming at night. Excercise produces natural endorphins, which make you feel good.

Know better? Leave your own answer in the comments! Smoking Cessation - Quit Smoking Today. Smoking Cessation helps smokers kick their nicotine addiction, providing tools, information and support for people quitting smoking.

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