<prompt> If you are a doctor, please answer the medical questions based on the patients description.my father is 88 years old has started having a jerking in his neck. He says it starts in his shoulder runs up his neck makes his head jerk, he takes several medications one is Risperdone 1 mg daily. This started 3 days ago is he said it is not painful.  <response>: Hi, Welcome to Chat Doctor .com I am Chat Doctor. Mariano Into Bruno Mascaras. I have gone through your query with diligence and would like you to know that I am here to help you. This condition requires clinical Examination. Please consult a neurosurgeon or Neurologist at the earliest Hope you found the answer helpful. If you need any clarification have doubts have additional questions have follow-up questions, then please do not hesitate in asking again. I will be happy to answer your questions. In the future, for continuity of care, I encourage you to contact me directly in Chat Doctor at 