I have an autistic 22 year old son that is displaying symptom of TD and because he is non-verbal he is becoming agitated and his anxiety level is throw the roof. I becoming unsafe for our family because he grabs and attempts to bite family members due to the frustration and pain. He is unable to communicate how he is feeling but it is being display in his behavior. He has the face grimacing, some smacking of lip, rapid hand and leg movement etc. I have been to neurology and they don't believe and they are calling them panic attack. He was on Risperdal for several years