<s>[INST] My friend s son had a traumatic brain injury 3 years ago.Was doing well with walking and talking...They have put him on Risperdal. He has no expression to his face,hardly talks anymore and has a stilted gait. also has gained a lot of weight. Would the Risperdal cause this change in him. Thank you [/INST] HI your friends son might be having hyperactivity for which he might have been started on Risperdal.Weight gain is the side effect of this drug. and others may due to the brain injury he suffered. Risperdal perse wont heal, but will help in decreasing some symptoms.Thanks </s>