Study to Assess the Effect of Pharmacokinetics/Pharmacodynamics (PK/PD) Interaction After co-Administration of Cilostazol With Ginkgo Biloba or Placebo

Inclusion Criteria: * healthy male adult volunteer between 19 and 45 years of age and within 15% of ideal body weight by broca's formula. * the subjects who doesn't have any congenital or chronic diseases and symptoms or signs of diseases after physical examinations.\] Exclusion Criteria: * the subject who has abnornal lab. ( In particular, AST or ALT \> 1.25 times of upper limit / Total bilirubin \> 1.5 times of upper limit/170,000 \< Platelet \< 360,000 / PT or aPTT or BT\> \>upper limit * the subject who receive any metabolic enzyme inducing or inhibiting drugs like barbiturates or drink excess alcohol within 1 month prior to the study.