Long-Term Effect of Botulinum Toxin in the Treatment of Benign Essential Blepharospasm and Hemifacial Spasm

Objectives: In this study, we evaluated the long-term effects of botulinum toxin A (BTA) in patients diagnosed with benign essential blepharospasm (BEB) and hemifacial spasm (HFS) comparing the drug dose in early and late periods and mean duration of relief. Materials and Methods: The records of patients who were treated with BTA for BEB and HFS were analyzed retrospectively. The patients who had