It seems that the drug mentioned is called Fanapt=Iloperidone=Zomaril.

Also seems that the source was a crank call and there is no evidence that the story is true.

He was surely prescribed something since he was very close to being committed to a mental institution.

That seems to be the reason he killed mommy.

There were 6 or 7 guns just lying around the house. Why the Hell were they not in a locked gun safe?