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Updated: Mar 26, 2026

Ultrasound-guided Botulinum Toxin-A Injections: A Method of Treating Sialorrhea
Published on: November 9, 2016
The Difference of Treatment Results between Botulinum Toxin A Split Injection Sites and Botulinum Toxin A Non-Split
Objective:
To compare hemifacial spasm treatment results between Botulinum toxin A split injection sites and Botulinum toxin A non-split injection sites.
Material And Method:
Thirty-one hemifacial spasm patients were randomly assigned into the non-split injection sites group (injecting Botulinum toxin A to the zygomaticus major and risorius each) or split injection sites group with the same amount of Botulinum toxin A as the first method (injection Botulinum toxin A to the zygomaticus major and minor and risorius two injections each) The main outcomes are onset of improvement and effective duration of treatment.
Results:
Fifteen patients were assigned to non-split injection sites group and 16 patients were assigned to split injection sites group. The median onset of improvement in non-split injection sites group and split injection sites group was 4.0 and 4.5 days, respectively (p = 0.984). The effective duration of treatment in the non-split injection sites group was 60.0 days and in the split injection sites group was 54.5 days (p = 0.582).
Conclusion:
The splitting of injection sites did not signicantly improve the efficacy of Botulinum toxin A in the treatment of hemifacial spasm.
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