As for treating tardive, standard options include Bachofen, Aricept, Requip and Mirapex. More experimental options include
Namenda, Tetrabenzene and Zofran. Vimpat has been helpful in me and will be written up in a case study but that's a clinical first literally. One natural remedy that if supervised by a neurologist can be markedly helpful is rhodiola. Botox shots for focal dystonia are helpful if it is limited to one area.