Can someone explain to me or give me some links to show what exactly atypical antipsychotics are meant to do?

I thought they were for psychosis and mania and things like that. Right?

But I'm not really sure if that's what they're doing for me.

I'm in the process of switching from one brand to another because of cost and every time I play around with the antipsychotic in my cocktail, the things that get messed around with really have nothing to do with mania. It's more like depression. It doesn't make sense.

I guess I just would like a better understanding of what exactly this drug is supposed to be doing for me.

I'm currently on Risperidone (Risperdal). Used to be on Invega.