Stimulants to lose weight antipsychotics caused to gain?

So I never had excess weight but suddenly I've gained some unwanted fat I wanna lose. Especially in my belly. Its not so much but I wouldnt feel comfortable putting off my shirt. I know It's not the best idea to use drugs to lose weight but do you think stimulants will help me by not having the need to eat that much? I'll try do some exercise in the meantime.