Like many other medicines, Risperidone has side effects including high blood glucose levels and weight gain. In children the drug also causes high prolactin levels in blood. On the other hand, there are not many medicines approved for use in Autism. Hence one has to weigh advantages v/s side effects. Assuming that the improvement in the child is due to medication, one has to take a call on the best course of action. In my personal opinion medication should continue.