[Upper gastrointestinal tract dysfunction and its correction by dopamine agonists for patients with Parkinson's disease of I-III stage].

The inclusion of piribedil (150-250 mg/day) in the 6-months therapy reduces the dysfunction of the upper gastrointestinal tract (by 61 and 74% of the initial level of dysphagia and sialorrhea, respectively) regardless the drug use in monotherapy or in complex therapy with levodopa.