Saliva production was measured in 8 patients with Parkinson disease who complained of drooling, in 9 patients with Parkinson disease and dry mouths, and in 14 controls. No difference was found between the two groups with Parkinson disease. Drooling was not due to excessive salivation but was probably due to defective swallowing. It is not surprising therefore that the majority of drooling patients were not improved with atropine-like drugs.
Bateson MC, Gibberd FB, Wilson RSE. Salivary Symptoms in Parkinson Disease. Arch Neurol. 1973;29(4):274–275. doi:10.1001/archneur.1973.00490280086013
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