GSK1325756 Relative Bioavailability Study in Healthy Elderly Subjects

Inclusion Criteria: * Subjects must be 65 to 80 years of age inclusive, at the Screening Visit. * Subjects who are healthy, as determined by a responsible and experienced physician, based on a medical evaluation including medical history, physical examination, laboratory tests and cardiac monitoring or a subject with a clinical abnormality or laboratory parameters outside the reference range for the population being studied may be included if the investigator and the GlaxoSmithKline (GSK) Medical Monitor agree that the finding is unlikely to introduce risk factors and will not interfere with the study procedures and objectives. Additionally, laboratory assessments that are specifically listed in the inclusion or exclusion criteria and are outside of the reference range can be repeated once during the screening period. * Body weight \>=50 kilograms (kg) and body mass index (BMI) within the range 19 - 34 kg per meter square (kg/m\^2) (inclusive). * Male or female subjects will be included. A female subject is eligible to participate if she is not pregnant, not breastfeeding, and at least one of the following conditions applies: Not a woman of childbearing potential (WOCBP) or a WOCBP who agrees to follow the contraceptive guidance during the treatment period and for at least 60 hours after the last dose of study treatment. * Capable of giving signed informed consent. * AST, ALT, alkaline phosphatase and bilirubin \<= 1.5 × upper limit of normal (ULN) (isolated bilirubin \> 1.5…