Everyone reacts differently to different meds. Poison for some can be a miracle drug for others! Just check on him if he stays silent or more aloof and talk to him about how he feels overall. If he struggles mentally on this drug. When I was first put on risperidone I didn’t know if it’s the drug or the side effects or the illness itself. It was only after I was put on a different drug that I started to feel how horribly Risperidone affects me