I gained weight really quickly on Zyprexa too, no increase in eating tho. Zyprexa is known for the weight gain. It helped my mania and psychosis pretty good tho, it was pretty effective for that and sleep. Akathisia (restlessness), orthostatic hypertension ( I did get this pretty bad), body temperature regulation problems, and I did get dry mouth too.

There are many more side effect so I would look it up. There can be some serious side effects with all atypical antipsychotics, that you should be aware of. Just in case you're not familiar. I think Geodon might be one of the antipsychotics with less side effects?

Not trying to scare you from it either, I have had good results with Zyprexa a few times.