Functional Dyspepsia: Validation of a Questionnaire for Symptom Assessment in FD PDS Subgroup

Inclusion Criteria: * Patients with PDS diagnosis as per Rome III by Rome III questionnaire (see appendix 1B) * Patients must provide witnessed written informed consent prior to any study procedures being performed * Patients aged between 18 and 70 years inclusive * Male or female patients * Patients who are capable to understand the study and the questionnaires, and to comply with the study requirements Exclusion Criteria: * Patients with any condition which, in the opinion of the investigator, makes the patient unsuitable for entry into the study * Patients with an active major psychiatric condition (depression, anxiety disorder, alcohol or substance abuse). Patients who are taking a stable dose of a single antidepressant (with the exception of amitryptiline) during the last 3 months are eligible. * Females who are pregnant or lactating. * Patients who are H. Pylori positive or patients who received treatment for HP eradication during the last 3 months. * Patients suffering from diabetes type 1 or type 2. * Patients taking medication for functional dyspepsia will need a wash-out period of 2 weeks before they can be screened * Patients with known hypersensitivity to gastroprokinetic drugs. * Patients with confirmed gastro-intestinal disease. * Patients with former digestive surgery affecting upper gut motility. * Patients affected by concomitant disease responsible for digestive symptoms * Patients presenting with predominant symptoms of irritable bowel syndrome (IBS) * Patients presenting symptoms of EPS several times a week according to Rome III questionnaire * Patients presenting daily symptoms of CIN on Rome III questionnaire * Patients presenting vomiting more than one day a month. * Patients presenting daily symptoms of Excessive belching according to Rome III questionnaire * Patients presenting predominant GERD according to GERD questionnaire