Biochemical and chemical preparations for medical purposes, in particular those with the active ingredient thiethylperazine; biochemical and chemical preparations for medical purposes, in particular those with the active ingredient thiethylperazine, for use in neurodegenerative diseases; biochemical and chemical preparations for medical purposes, in particular those with the active ingredient thiethylperazine, for use in trinucleotide repeat disorders, in particular for use in Huntington's Ch...