HI Sounds as though your Dad may be having drug interactions....is he on a new antibiotic or anti inflamatory or antihistimine or decongestant...even over the counter type medication. There are two prescription type drugs than can be given to reduce this interaction.....but he needs to get to an emergency room where there are knowing neurologists on call......or call your own movement disorders specialist and get the prescriptions to be given at home. Dr. Pfeiffer (Memphis) was able to help me with this problem with drug interactions. Rita Weeks 55/10