This will be a randomized, open-label, single-dose, five-period, crossover study in healthy volunteers to compare the relative bioavailability of 5 oral GSK1605786 formulations. Recruitment/screening will occur within approximately 30 days of the first scheduled dose of study medication. Each subject will participate in five dosing sessions - each dose will be separated by at least seven days. The total duration of a subject's participation in the study, from Screening to Follow-up, is approximately 10 weeks.