If I diet and exercise, can I lose weight while taking Cymbalta?

I've gained 70 lbs since beginning anti-depressants 2 years ago. I'm ready to get this weight off. I know my eating habits are awful and I used to drink a lot. Now I'm ready to get better. I stopped drinking a week ago and have been making conscious efforts to eat better. I was wondering if it will be possible to lose weight while on Cymbalta? (I also am weaning off Effexor, take 100 mg of Lamictal daily for mood stabilizing, and .5mg of Klonopin for anxiety). I work in an office.