A Phase 1 (Ph1), Single Dose (SD), GSK961081 Absorption, Distribution, Metabolism, and Excretion (ADME) Study in Healthy Subjects

Inclusion Criteria: * Between 30 and 55 years of age inclusive, at the time of signing the informed consent. * Healthy as determined by the investigator or medically qualified designee based on a medical evaluation including medical history, physical examination, vital signs, laboratory tests, and cardiac monitoring. A subject with a clinical abnormality or laboratory parameter(s) which is/are not specifically listed in the inclusion or exclusion criteria, outside the reference range for the population being studied may be included only if the investigator agrees and documents that the finding is unlikely to introduce additional risk factors and will not interfere with the study procedures. * A history of regular bowel movements (averaging one or more bowel movements per day). * Body weight \>=50 kilograms (kg) and body mass index (BMI) within the range 19.0-31.0 kg/square metre (m\^2) (inclusive) * Sex: Male * Subjects with female partners of child bearing potential must use a condom from the time of first dose of study medication until follow-up. * Capable of giving signed informed consent as described in protocol which includes compliance with the requirements and restrictions listed in the consent form. Exclusion Criteria: * Alanine aminotransferase (ALT) and bilirubin \>1.5xupper limit of normal (ULN) (isolated bilirubin \>1.5xULN is acceptable if bilirubin is fractionated and direct bilirubin \<35%). * Current or chronic history of liver disease, or known hepatic or biliary abnormalities (with the exception of Gilbert's syndrome or asymptomatic gallstones). * Mean corrected QT interval (QTc) \> 450 milliseconds (msec) * Any clinically relevant abnormality identified at the screening medical assessment (physical examination/medical history), clinical laboratory tests, or 12-lead ECG. * A pre-existing condition(s) interfering with normal gastrointestinal (GI) anatomy or motility, including constipation, malabsorption or other GI dysfunction which may interfere with the absorption, distribution, metabolism or elimination of the study drug. Subjects with a history of cholecystectomy must be excluded. * At screening, a supine blood pressure (BP) that is persistently higher (triplicate measurements at least 2 min apart) than 140/90 millimetres of mercury (mmHg). * At screening, a supine mean HR outside the range 40-90 beats per minute (BPM). * Subject is mentally or legally incapacitated. * A history of respiratory disease (e.g. history of asthmatic symptoms) in the last 10 years. * Use of prescription or non-prescription drugs, including vitamins, herbal and dietary supplements (including St John's Wort) within 7 days (or 14 days if the drug is a potential enzyme inducer) or 5 half-lives (whichever is longer) before the first dose of study medication, unless in the opinion of the investigator and GlaxoSmithKline (GSK) Medical Monitor the medication will not interfere with the study procedures or compromise subject safety. * History of regular alcohol consumption within 6 months of the study, defined as an average weekly intake of \>21 units. One unit is equivalent to 8 grams (g) of alcohol: a half-pint (approximately 240 millilitres \[mL\]) of beer, 1 glass (125 mL) of wine or 1 (25 mL) measure of spirits. * Urinary cotinine levels indicative of smoking; current smoker; or ex-smokers who gave up less than 6 months ago or who have a history of more than 10 pack-years. Pack-years = cigarettes per day multiplied by number of years smoked then divided by 20. * History of sensitivity to any of the study medications or its components, or a history of drug or other allergy that, in the opinion of the investigator or Medical Monitor, contraindicates the subject's participation. * Presence of hepatitis B surface antigen (HBsAg), or positive hepatitis C antibody test result at screening or within 3 months before the first dose of study treatment. * A positive test for Human Immunodeficiency Virus (HIV) antibody * A positive pre-study drug/alcohol screen. * The subject has participated in a clinical trial and has received an investigational product (IP) within 3 months before their first dose in the current study. * Exposure to more than four new chemical entities within 12 months before the subject's first dose. * Participation in a clinical trial involving administration of 14C-labelled compound(s) within the last 12 months. A subjects' previous effective dose will be reviewed by the medical investigator to ensure there is no risk of contamination/carryover into the current study. * Subjects who have received a total body radiation dose of greater than 5.0 millisievert (mSv) (upper limit of World Health Organization \[WHO\] category II) or exposure to significant radiation (e.g. serial x ray or computed tomography \[CT\] scans, barium meal etc) in the 12 months before this study. * An occupation which requires monitoring for radiation exposure, nuclear medicine procedures or excessive x-rays within the past 12 months. * Unable to refrain from consumption of red wine, Seville oranges, grapefruit or grapefruit juice from 7 days before the first dose of study medication until the follow-up visit. * Where participation in the study would result in donation of blood or blood products in excess of 500 mL within a 90 day period. * Unwillingness or inability to follow the procedures outlined in the protocol, including the use of the enterotest capsule.