What do systematic reviews say?

Botulinum toxin vs placebo

Botulinum toxin injection may leads to lower adverse effects compared with placebo (low certainty).

• Treatment for sialorrhea (excessive saliva) in people with motor neuron disease/amyotrophic lateral sclerosis 2022 · Cochrane Headline outcomes only
  no estimate extracted
  1 study · 20 participants
  Low