I have been reading with interest some of the posts on the dosage and timing of sinemet. My mother often has serious bouts of what my dad calls "slapping"--wild arm movements--usually in the late afternoon after the sinemet wears off. Also she has painful rigidity in one side which I also have seen described recently. We think that maybe she needs to decrease her dosage of sinemet-- so far that seems to help. Here is my question: Is the technical term for the arm slapping "dyskinesia"? I know that the term means some time of abnormal motion. My mother has a new neurologist who actually thought that she has a mild case of PD but that many of her symptoms come from essential tremor. She had the ET for a long time and it runs in the family (now at least 4 generations). The neurologist took her off sinemet and after a day or so, my mother became so weak that my dad had to put her back on sinemet. It appears that she has both ET and PD. Second question: Is the weakness after going off sinemet farily good proof that that PD is a significant factor in my mother's health? Thanks. Bryce Jones