Could risperdal make ADHD worse? My son was prescribed it for anxiety, sleeping problems and irratablity after being diagnosed with PDD at 5 1/2 years old. They didn't mention ADHD but the previous councler he seen did and he is very hyper and out of control and it seems like since starting risperdal 6 wks ago that he may be even more hyper even after taking the meds. Could it be the meds making ADHD more obvious?