Well you see once you switch him over to abilify from haloperidol so along with this you shall also get him weaned off from vistaril , the anti histaminic drug which was solely being used as a shield along with haloperidol to prevent development of extrapyramidal symptoms which haloperidol being an old generation anti psychotic is known to precipitate.But abilify being a much refined and new generation anti psychotic with better side effect profile that does not lead to these distressing extrapyramidal side effects , so vistaril will no longer be required with the use of abilify.
Secondly you may also bring him off trazodone and substitute it with use of abilify given as a single dose once a day at night time after dinner so that the sedative
action of abilify provide him a good night sleep bypassing the need for any sleep aid drug. If this works for his sleep then there is nothing like it but if abilify is unable to provide him proper sleep then you may add
ambien at dose of 5-10 mg as per the need to be given before bedtime.
So to summarize--
-- Two drugs can be withdrawn along with haloperidol , these being vistaril and trazodone.
-- Abilify use at nigh time shall most possibly take care of his sleep problem as well, but it that does not happen then ambien may be used.
Kindly discuss this with his doctor and do the needful changes.
I hope this helps.
Wish you all the best and God bless.