This is a randomized, open-label, single & multiple-dose, parallel study to investigate the effect of cilostazol on the disposition of simvastatin & pravastatin in healthy male volunteers

Eligibility for participation of this study will be determined from demographic information, medical history, physical examination, electrocardiogram (ECG) and clinical laboratory tests within 4 weeks before study drug administration. Subjects suitable for this study will be admitted to the Clinical Trial Center of Ajou University Medical Center on the day before dosing (Day -1).

On Day 1, Subjects will be dosed simvastatin 40 mg or pravastatin 20 mg. Pharmacokinetic samplings and blood pressure/pulse rate measurement will be done upto 24 hours after dosing.

From Day 2 ~ 7, Subjects will be dosed cilostazol 100 mg twice a day. On Day 8, Subjects will be dosed simvastatin 40 mg or pravastatin 20 mg with cilostazol 100 mg twice a day. Pharmacokinetic samplings and blood pressure/pulse rate measurement will be done upto 24 hours after dosing.

Inclusion Criteria:

• Healthy male subjects aged 20 - 45 years
• With in 20% of ideal body weight, {Ideal body weight=[height(cm)-100]*0.9}
• Agreement with written informed consent

Exclusion Criteria:

• Clinically significant cardiovascular, pulmonary, hepatic, renal, hematologic, gastrointestinal disease or mental disorder (Past history or present)
• Inadequate result of laboratory test (especially, AST/ALT > 1.25 x UNL, Total bilirubin > 1.5 x UNL)
• Positive reaction in the HBs Ag, anti-HCV Ab, anti-HIV Ab, VDRL test
• Taking OTC(Over the counter)medicine including oriental medicine within 7 days
• Clinically significant allergic disease (Except for mild allergic rhinitis and dermatitis seems to be not need for medication)
• Subject with known for hypersensitivity reaction to Cilostazol, Simvastatin or Pravastatin
• Previous whole blood donation within 60 days or component blood donation within 30 days
• Previous participation of other trial within 90 days
• Continued taking caffeine (caffeine > 5 cup/day), drinking (alcohol > 30 g/day) and severe heavy smoker (cigarette > 1/2 pack per day)
• An impossible one who participates in clinical trial by investigator's decision including for reason of laboratory test result