I've gained a little weight but not much, nothing too ridiculous. And my memory does suck really bad but I don't know if it is because of the risperidone or one of my other meds. All I know is that my memory used to be so good and now it's crap and it's kind of annoying. When I first started taking it I do remember feeling very tired and lethargic but as my body got used to the med I started getting my energy back and I don't even notice it at all anymore.