TO assess the PK/PD effect of co-administerd Cilostazol with Ginkgo biloba or placebo, Phase I study in healthy Volunteers were designed

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.