hi, i am a nurse, and i tend to work alot with patients like your dad, risperadil is an antipsychotic drug, and it does have its place when patients become agressive and pose a risk to themselves and others, however its not intended to be used long term in patients with your dads condition, we tend to
use it, only
in extreme circumstances and again only for a very very limited period
of time, ie maybe one to two days.