Botulinum Toxin Treatment of Blepharospasm, Orofacial/Oromandibular Dystonia, and Hemifacial Spasm.

Blepharospasm is a focal dystonia characterized by involuntary, repetitive eye closure. Orofacial and oromandibular dystonia describe involuntary dystonic movements of orofacial and oromandibular musculature. Hemifacial spasm is characterized by repetitive synchronous contraction of facial nerve innervated muscles on one side of the face. In this article, the clinical presentation, epidemiology, and approaches to treatment are reviewed. Technical aspects of using botulinum toxin for treatment and reported outcomes are discussed.