The purpose of this study is to determine whether DA-9701(Motilitone) is effective and safe for the treatment on health-related quality of life in Parkinson's disease (PD) patients with gastrointestinal symptoms.

Gastrointestinal (GI) symptoms are frequently complained by PD patients. To improve their symptoms, prokinetics are often used in clinics. However, some prokinetics are dopamine receptor antagonist which can aggravate motor symptoms of PD patients or develop tardive dyskinesia when it affects dopamine receptors of the brain.

DA-9701 (Motilitone) is recently developed herbal medication which has both 5-HT4 agonism and D2 antagonism. Furthermore, it does not cross the blood brain barrier that can be safely used in PD patients. Hypothetically it has a potential to be a good choice for the treatment of GI symptoms of PD patients. However, there has been no study that evaluates its efficacy and safety by randomized clinical trials in PD patients.

This study will evaluate the efficacy and safety of DA-9701 in the double-blind placebo-controlled phase 1 (4 weeks), and the long-term safety of DA-9701 in the open-label phase 2 (8 weeks after phase 1).

Inclusion Criteria:

• Subjects were enrolled voluntarily and understood the contents of this clinical trial.
• Male or female Parkinson disease (PD) patients between 50 and 80 years
• Subjects who had not received prokinetics (itopride, mosapride, Corydalis tuber, levosulpiride, domperidone, etc.) at least 2 months prior to baseline visit
• Subjects complained at least one symptom of the following that suggests abnormal bowel functions: anorexia, nausea, abdominal distension, dyspepsia, early satiety, dysphagia, foreign body sensation associated with a meal, symptoms of gastroesophageal reflux, constipation, and defecation problem.

Exclusion Criteria:

• History of a gastrointestinal operation
• Subjects with active gastrointestinal diseases under treatment of gastroenterology within 1 month
• Existence of clinically significant cognitive decline or K-Minimental Status Exam score 20 or less
• Subjects had depression or other psychiatric disorders treated with medications such as antidepressants or antipsychotics; mood tranquilizers, benzodiazepines, and sleep pills were permitted with fixed dose during a period of the clinical trial
• Subjects with severe active comorbidities which could interfere the quality of life of the patient
• Subjects with medical conditions which make difficult to be enrolled to the trial judged by clinicians
• Subjects with hypersensitivity or adverse event related to DA-9701 (Motilitone)
• Prior participation to other clinical trials within 3 months

DATA including IPD can be shared individually upon request by qualified investigators excluding patients' personal information

The information will be judged by the principal investigator upon individual request.

The information will be judged by the principal investigator upon individual request.