 - 1. Clinically significant disorders of hepatobiliary system, kidney, neurology, respiratory, hemato-oncology, endocrine, dermatology, urology, ophthalmology, psychiatry, musculo-skeletal system, immunology, otorhinolaryngology, and cardiovascular system 2. Gastrointestinal diseases or surgery which may affect absorption of the investigational products 3. hypersensitivity to tadalafil or phosphodiesterase type 5 inhibitor, and dutasteride or 5-α reductase inhibitor 4. Lactose intolerance 5. SBP 140 mmHg or 90 mmHg or DBP 95 mmHg or 60 mmHg 6. Serum creatinine ULN 7. History or positive result of drug abuse 8. Drugs which induce or inhibit drug metabolism including barbiturates within 1 month 9. Prescribed drugs or herbal medicines within 2 weeks, or over-the counter drugs or vitamins within 1 week 10. CYP3A4 inhibitors or CYP3A4 inducers within 2 weeks 11. Food including grapefruit from Week -1 to final dose 12. Participated and administered the investigational products in other clinical trial within 2 months 13. Donated whole blood within 2 months or apheresis within 1 month, or transfusion within 1 month 14. Plans to donate blood for at least 6 months after final dose of dutasteride 15. Scheduled dental treatment and elective surgery from informed consent to post-study visit 16. Excessive alcohol consumption 21 unitsweek, 1 unit 10 g of pure alcohol 17. Smoked more than 10 cigarettes a day for past 3 months 18. Not eligible due to other reasons including laboratory results 