Exploratory Study for Dry Mouth in Patients With Sjögren's Syndrome

Inclusion Criteria: 1. Patients with Sjögren's syndrome (Revised Japanese criteria for Sjögren's syndrome (1999): 1998 research report on immunological intractable diseases specified by the Japanese Ministry of Health and Welfare) 2. Patients aged 20 years or older at time of consent 3. Patients with dry mouth 4. Patients with decreased salivation Exclusion Criteria: 1. Patients who have developed dry mouth clearly due to a cause other than Sjögren's syndrome 2. Patients in whom Saxon test cannot be performed (artificial tooth, tooth implant, etc.) 3. Patients who have received rebamipide within 3 months prior to obtaining informed consent 4. Patients who are pregnant, possibly pregnant, or lactating 5. Patients with a history of hypersensitivity to rebamipide 6. Patients who have received any other investigational drug within 3 months prior to obtaining informed consent 7. Patients who are otherwise judged inappropriate for inclusion in the study by the investigator or subinvestigator