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.