Water, lots of water. When I was first on psych meds I did not drink as much water. Two meds I was on caused massive weight gain.

Another doctor wanted to prescribe mirtazapine (sp) for me. Grrr. I did not use the script. (I probably ''should'' not say this... the doctor was very overweight and also horrible with her words )

I've lost the weight now though. I think some meds are weight neutral (?) although I have not experienced that (aside from benzos) I also do not snack at night if I find myself putting on some weight again.