Treatment of Excessive Salivation in Parkinson's Disease

Introduction to Treatment

The American Thoracic Society recommends starting with an oral anticholinergic medication as first-line therapy, and if this fails or causes intolerable side effects, proceeding to botulinum toxin injections into the salivary glands 1

Excessive salivation in Parkinson's disease is not caused by increased saliva production but by impaired swallowing, leading to saliva pooling in the mouth, affecting 50-60% of patients 1
The underlying mechanisms include lingual bradykinesia, oropharyngeal dysphagia, and upper esophageal sphincter dysfunction 2

The American Academy of Sleep Medicine suggests that oral anticholinergic medications, such as glycopyrrolate or scopolamine, should be used as first-line treatment, as they work by blocking acetylcholine muscarinic receptors, reducing parasympathetic activity and decreasing saliva secretion 1
The American Academy of Neurology recommends continuing anticholinergic medication only if benefits outweigh side effects, as they can cause cognitive disturbances, urinary retention, constipation, and blurred vision in older adults 1
Scopolamine patches may be better tolerated than oral agents in some patients, according to the American Academy of Sleep Medicine 3
The American Geriatrics Society advises that in elderly PD patients with cognitive impairment, anticholinergics carry significant risk of delirium and should be used cautiously or avoided 1

The American Academy of Neurology recommends injecting botulinum toxin type A into the parotid and submandibular glands under ultrasound guidance if anticholinergics fail or cause intolerable side effects 1, 3
This approach is safe and effective with prolonged salivary reduction lasting approximately 4 months, according to the American Academy of Sleep Medicine 3

The American Speech-Language-Hearing Association suggests considering swallowing rehabilitation with lingual strengthening exercises and forced swallowing maneuvers 3
The American Academy of Sleep Medicine recommends postural adjustments, such as chin-tuck position during swallowing, to prevent aspiration 2, 3

The American Academy of Neurology advises against using rivastigmine or other acetylcholinesterase inhibitors to treat sialorrhea, as they worsen the problem by increasing cholinergic activity 2
The American Academy of Sleep Medicine recommends avoiding benzodiazepines like clonazepam for sialorrhea management, as they worsen motor function, increase fall risk, and cause cognitive impairment without addressing the underlying problem 4, 5
The American Thoracic Society suggests monitoring for aspiration pneumonia, as untreated sialorrhea significantly increases this risk and is associated with reduced survival 2, 3