Incobotulinum toxin A did not help drooling in Parkinson’s disease in this study.
The study did not have precision to exclude a moderate benefit.
The dose of Incobotulinum toxin A in the parotid glands may have influenced results.
A meta-analysis of all studies shows that Botulinum toxin is useful for drooling in Parkinson’s disease.
We discuss reasons for differences in the results of our study and previous studies.