A hepatitis C outbreak in southern Nevada has prompted the state’s governor to enact new regulations barring practitioners from administering medications from single-dose vials to multiple patients. Although investigators didn’t specifically target Botox (botulinum toxin A; Allergan, Irvine, Calif.), local cosmetic surgeons say that the rule has driven Botox costs out of reach for many patients while spotlighting long-standing confusion over Botox’s labeling.