How fast after stopping an antidepressant does weight gain stop?

Hello Mmmarino25, I feel your pain. I gained over 10kg the first month of taking Zyprexa, not to mention it made me so sleepy I was only waking to eat etc and spent most of my time asleep on the couch!
Once I stopped the medication my energy levels returned to somewhat normal levels and the weight came off, a bit slower than it went on, but it still came off :)
I hope this helps!