My difficult child is taking Risperdal and as far as I can tell it is being used as a mood stabilizer. He has been in a Residential Treatment Center (RTC) program for a month now with no move towards a more traditional mood stabilizer being used. He was placed in the Residential Treatment Center (RTC) program because he was very destructive in my home, he was not though violent towards anyone here. His team is moving towards a Pervasive Developmental Disorder (PDD) Spectrum diagnosis but that seems to change from week to week (this week it's the Pervasive Developmental Disorder (PDD) diagnosis last week it was a mood disorder). I know these things can be co-morbid and I also understand that the neuropsychologist will give us more information about what we are dealing with. We are gearing up for the fact that difficult child will be home at the end of the week with day treatment Monday through Friday for a few more weeks. Before I ask my question to the psychiatrist (I'm not super impressed with him to begin with) and he decides I'm an idiot, I'll ask here . If my difficult child doesn't rage all the time (very rarely infact) can the Risperdal be used a PRN (or is it PNR, I switch the letters sometimes) and not an on going everyday medication?