a non-psychotic taking anti-psychosis medication

I wanted ask if someone has been taking anti-psychotic medication and they are not actually psychotic...what damage can this cause to their mind?

It depends what it is, what dosage and for how long For example a low dose of say Quetiapine would initially render any normal person, er, non functional for a day As I say it depends, it's not recommended

The tablets are called rispiridone, and the dosage was 0.5mg twice a day.

Well abruptly stopping - not recommended - would initially (but not immediately) leave your brain reeling, diminishing over a few months, but long term things would generally settle back down to as normal as they can be