Inclusion Criteria:  Patients of the PI Age 18-80 Male or female With an approved indication for BoNT such as dystonia or hemifacial spasm Have received either two or three BoNT injection cycles within the prior 8 months Prior two injection cycles length differed by no more than 2 weeks Prior two injection cycles used same brand of BoNT and similar dose within 15%  Exclusion Criteria:  Concommitant use of penicillamine or cisplatin