A Study to Determine the Bioavailability of a Fixed Dose Combination Product of Dutasteride (0.5mg) and Tamsulosin Hydrochloride (0.2mg) Relative to Co-administration of the Individual Components in Healthy Male Subjects of North East Asian and Non-Asian Ancestry.

This study will be an open-label, randomized, single dose, two-period crossover study to determine the bioavailability of a fixed dose combination capsule formulation of dutasteride and tamsulosin hydrochloride (0.5mg/0.2mg) relative to co-administration of dutasteride 0.5mg capsules and tamsulosin hydrochloride 0.2mg tablets in healthy male subjects of North East Asian and non-Asian ancestry. Subjects will receive single oral doses of a combination capsule formulation of dutasteride 0.5 mg/ tamsulosin 0.2 mg in a fed or fasted state or concomitant dosing of dutasteride 0.5 mg and the Japan-sourced Harnal-D 0.2 mg in a fed or fasted state. Each dose of study medication will be separated by a 28-day washout period. Blood samples for pharmacokinetic analysis will be taken at regular intervals after dosing. Safety will be assessed by measurement of blood pressure, heart rate, safety laboratory data, and review of adverse events. The study will enrol 88 healthy male subjects to ensure that 80 complete the study. At least twenty percent of the study population will be of Japanese ancestry, approximately 20% will be of Chinese ancestry and approximately 20% of Korean ancestry while the remainder of the population will be of non-Asian ancestry.