[Olanzapine improves chorea in patients with Huntington's disease].

INTRODUCTION: The main treatment for choreatic movements associated to Huntington s disease are the neuroleptic drugs, however, its use causes long term troubles. CASE REPORTS: We describe two patients with a predominantly choreic Huntington s disease, who experience improvement of choreatic movements after introduction of olanzapine to their treatment, being this drug well tolerated. CONCLUSIONS: The improvement of chorea suggests that olanzapine has a dopaminergic D2 receptors blocking action.