Yes Risperdal, I'm afraid, almost killed my mother. It wasn't until I took her off it that she became well again. However, now she has permament Tardive Dyskinesia.
My sister-in -law is also on Risperdal. Though she seems to function with it OK .... she is very toxic. In my view, the drug caused toxicity to the liver that my mother could just not metabolize. I'd be very careful giving this to a child. Sorry, I don't mean to alarm you. Just keep the dose as low as possible. Any ONLY keep him on it if the results are truly worth it. If the results are minimal I would think twice.
This has just been my own personal experience. After preparing for my mother's death for weeks I finally decided to take her off risperdal. What was the point I thought she was dying? Within two days of taking her off she sat up!! I was shocked! I said, "Mom how do you feel?" And she said, "better." It was easy to put two and two together. She had suffered from Schizophrenia her whole life, which is why she was on the drug. Her personality changed dramatically on the drug. Granted the Schizophrenia subsided, but she never smiled again.
I took her off almost all sugar and changed her diet and she is doing remarkably well for 89 years young. There isn't a day that goes by that we don't laugh about something.