- Nitrates, papaverine, isoxsuprine, and NSAIDs within 4 weeks prior to screening visit. However, NSAIDs being taken for more than 4 weeks prior to screening visit may be administered at the same dose, 17) Patients with a history of hypersensitivity to cilostazol, 18) Patients who have received an investigational product or biological agent within 12 weeks prior to screening visit, 19) Patients who plans to enroll in another clinical trial (excluding observational studies) during this study, 20) Patients who needs to stop the Investigational Product because of scheduled operation, extraction of tooth or endoscopy, 21) Patients who are otherwise judged by the investigator to be inappropriate for inclusion in the study.