Study to Evaluate the Effect of GSK3640254 on the Pharmacokinetics of Tenofovir Alafenamide/Emtricitabine

HIV Infections Clinical Trial

Official title:

An Open-Label One-way Interaction Clinical Trial to Evaluate the Pharmacokinetic Interactions Between GSK3640254 and Tenofovir Alafenamide/Emtricitabine in Healthy Subjects

Clinical Trial Details — Status: Completed

Administrative data

• NCT number: NCT03836729
• Other study ID #: 208134
• Status: Completed
• Phase: Phase 1
• Start date: February 11, 2019
• Est. completion date: April 30, 2019

Study information

• Verified date: April 2020
• Source: ViiV Healthcare
• Contact: n/a
• Is FDA regulated: No
• Study type: Interventional

Clinical Trial Summary

Human immunodeficiency virus (HIV) infection frequently involves combination drug therapy for its treatment; hence, it is important to understand their interactions and resulting changes in exposure which are associated with medications. This is a Phase-1, open-label, fixed-sequence 2-period, one-way drug interaction study to assess the pharmacokinetic (PK), safety, and tolerability of GSK3640254 and Tenofovir alafenamide/emtricitabine (TAF/FTC) when administered alone and in combination in healthy subjects. The study will consist of a screening period of 28 days before the first dose of study intervention followed by 2 sequential treatment periods. Subjects will be administered TAF/FTC 25/200 milligram (mg) once daily (QD) on Days 1 to 14 of Period 1 followed by co-administration of TAF/FTC 25/200 mg QD with GSK3640254 200 mg QD on Days 1 to 7 of Period 2.

Recruitment information / eligibility

• Status: Completed
• Enrollment: 16
• Est. completion date: April 30, 2019
• Est. primary completion date: March 30, 2019
• Accepts healthy volunteers: Accepts Healthy Volunteers
• Gender: All
• Age group: 18 Years to 55 Years

Eligibility

Inclusion Criteria:

• Subject must be 18 to 55 years of age inclusive, at the time of signing the informed consent.

• Subjects who are healthy as determined by the investigator or medically qualified designee based on a medical evaluation including medical history, physical examination, laboratory tests, and cardiac monitoring (history and ECG).

• Body weight >=50.0 kilograms (kg) (110 pound [lbs]) for men and >=45.0 kilograms [kg] (99 lbs) for women and body mass index (BMI) within the range 18.5 to 31.0 kilograms per meter square (kg/m^2) (inclusive).

• Male or female; A female subject is eligible to participate if she is not pregnant, not breastfeeding and not a woman of childbearing potential (WOCBP).

• Capable of giving signed informed consent which includes compliance with the requirements and restrictions listed in the informed consent form (ICF) and protocol.

Exclusion Criteria:

• Current or chronic history of liver disease, or known hepatic or biliary abnormalities (with the exception of Gilbert's syndrome or asymptomatic gallstones).

• A pre-existing condition interfering with normal gastrointestinal (GI) anatomy or motility (e.g.,gastroesophageal reflux disease, gastric ulcers, gastritis), hepatic and/or renal function, that could interfere with the absorption, metabolism and/or excretion of the study drugs or render the subject unable to take oral study intervention.

• Any history of significant underlying psychiatric disorder including, but not limited to, schizophrenia, bipolar disorder with or without psychotic symptoms, other psychotic disorders, or schizotypal (personality) disorder.

• Any history of major depressive disorder with or without suicidal features or anxiety disorders, that required medical intervention (pharmacologic or not) such as hospitalization or other inpatient treatment and/or chronic (>6 months) outpatient treatment. Subjects with other conditions such as adjustment disorder or dysthymia that have required shorter term medical therapy (<6 months) without inpatient treatment and are currently well-controlled clinically or resolved may be considered for entry after discussion and agreement with the ViiV Medical Monitor.

• Any pre-existing physical or other psychiatric condition (including alcohol or drug abuse), which, in the opinion of the investigator (with or without psychiatric evaluation), could interfere with the subject's ability to comply with the dosing schedule and protocol evaluations or which might compromise the safety of the subject.

• Medical history of cardiac arrhythmias or cardiac disease or a family or personal history of long QT syndrome.

• History of any kidney disease or current or chronic history of impaired renal function as indicated by an estimated creatinine clearance <80 milliliters per minute (mL/min). Creatinine clearance (CrCL) is estimated by either of the following methods: (a) The Modification of Diet in Renal Disease (MDRD) equation: estimated glomerular filtration rate (eGFR) (milliliter [mL]/minute [min]/1.73 meter square [m^2]) = 175 x (SCr)^-1.154 x (Age)^-0.203 x 0.742 [if female] x 1.212 [if African American] glomerular filtration rate (GFR) is expressed in mL/min/1.73 m^2, SCr is serum creatinine expressed in milligrams per deciliter (mg/dL), and age is expressed in years. (b)The Cockcroft-Gault equation: CrCL(mL/min) ={((l40-age) x weight)/(72xSCr)}x 0.85 (if female) CrCL is expressed in mL/min, age is expressed in years, weight is expressed in kg, and SCr is serum creatinine expressed in mg/dL.

• Presence of Hepatitis B surface antigen (HBsAg) at Screening or within 3 months prior to starting study intervention.

• Positive Hepatitis C antibody test result at Screening or within 3 months prior to starting study intervention AND positive on reflex to Hepatitis C ribonucleic acid (RNA).

• Positive HIV-1 and -2 antigen/antibody immunoassay at Screening.

• ALT >1.5 × upper limit of normal (ULN). A single repeat of ALT is allowed within a single screening period to determine eligibility.

• Bilirubin >1.5 × ULN (isolated bilirubin >1.5 × ULN is acceptable if bilirubin is fractionated and direct bilirubin <35%).

• Any acute laboratory abnormality at Screening which, in the opinion of the investigator, should preclude participation in the study of an investigational compound.

• Any Grade 2 to 4 laboratory abnormality at Screening, with the exception of creatine phosphokinase (CPK) and lipid abnormalities (e.g., total cholesterol, triglycerides, etc), and ALT (described above), will exclude a subject from the study unless the investigator can provide a compelling explanation for the laboratory result(s) and has the assent of the sponsor. A single repeat of any laboratory abnormality is allowed within a single screening period to determine eligibility.

• A positive test result for drugs of abuse (including marijuana), alcohol, or cotinine (indicating active current smoking) at Screening or before the first dose of study intervention.

• Unable to refrain from the 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) prior to the first dose of study medication and for the duration of the study.

• Treatment with any vaccine within 30 days prior to receiving study intervention.

• Unwillingness to abstain from excessive consumption of any food or drink containing grapefruit and grapefruit juice, Seville oranges, blood oranges, or pomelos or their fruit juices within 7 days prior to the first dose of study intervention(s) until the end of the study.

• Participation in another concurrent clinical study or prior clinical study (with the exception of imaging trials) prior to the first dosing day in the current study: 30 days, 5 half-lives, or twice the duration of the biological effect of the study intervention (whichever is longer).

• Where participation in the study would result in donation of blood or blood products in excess of 500 mL within 56 days.

• Any positive (abnormal) response confirmed by the investigator on a screening clinician- or qualified designee-administered Columbia-Suicide Severity Rating Scale (C-SSRS).

• Any significant arrhythmia or ECG finding (e.g., prior myocardial infarction, sinoatrial pauses, bundle branch block, or conduction abnormality) which, in the opinion of the investigator or VH/GSK Medical Monitor, will interfere with the safety for the individual subject.

• Exclusion criteria for screening ECG (a single repeat is allowed for eligibility determination): Heart rate for male: <45 or >100 beats per minute (bpm) and for females: <50 or >100 bpm; PR interval: <120 or >200 milliseconds (msec); QRS duration: <70 or >110 msec and QTcF interval for male: >450 msec and for female: >470 msec. A heart rate from 100 to 110 bpm can be rechecked by ECG or vital signs within 30 minutes to verify eligibility.

• History of regular alcohol consumption within 6 months of the study defined as: an average weekly intake of >14 units. One unit is equivalent to 8 grams of alcohol: a half-pint (equivalent to 240 mL) of beer, 1 glass (125 mL) of wine, or 1 (25 mL) measure of spirits.

• Regular use of tobacco- or nicotine-containing products within 3 months prior to Screening.

• History of sensitivity to any of the study medications or components thereof or a history of drug or other allergy that, in the opinion of the investigator or medical monitor, contraindicates their participation.

Related Conditions & MeSH terms

• HIV Infections

Intervention

Drug:
• Tenofovir alafenamide/emtricitabine
TAF/FTC will be available as 25/200 milligrams (mg) tablet. Subjects will be administered TAF/FTC 25/200 mg QD via the oral route.
• GSK3640254
GSK3640254 will be available as 100 mg capsule. Subjects will be administered GSK3640254 200 mg capsule QD via the oral route.

Locations

Country	Name	City	State
United States	GSK Investigational Site	Austin	Texas

Sponsors (1)

Lead Sponsor	Collaborator
ViiV Healthcare

Country where clinical trial is conducted

United States, 

Outcome

Type	Measure	Description	Time frame	Safety issue
Primary	Period 1: Area Under the Plasma Concentration-time Curve From Time 0 to the End of the Dosing Interval at Steady State (AUC [0-tau]) of TAF	Blood samples were collected at indicated time-points for analysis of AUC (0-tau). Pharmacokinetic (PK) parameters were calculated by standard non-compartmental analysis. PK Parameter Population included all participants who underwent plasma PK sampling and had evaluable PK parameters estimated.	Pre-dose, 15, 30, 45 minutes, 1 hour, 1 hour 30 minutes, 2, 3, 4, 5, 6, 8, 12 and 24 hours in Period 1 Day 14
Primary	Period 2: AUC (0-tau) of TAF	Blood samples were collected at indicated time-points for analysis of AUC (0-tau). PK parameters were calculated by standard non-compartmental analysis.	Pre-dose, 15, 30, 45 minutes, 1 hour, 1 hour 30 minutes, 2, 3, 4, 5, 6, 8, 12 and 24 hours in Period 2 Day 7
Primary	Period 1: Maximum Observed Concentration (Cmax) of TAF	Blood samples were collected at indicated time-points for analysis of Cmax. PK parameters were calculated by standard non-compartmental analysis.	Pre-dose, 15, 30, 45 minutes, 1 hour, 1 hour 30 minutes, 2, 3, 4, 5, 6, 8, 12 and 24 hours in Period 1 Day 14
Primary	Period 2: Cmax of TAF	Blood samples were collected at indicated time-points for analysis of Cmax. PK parameters were calculated by standard non-compartmental analysis.	Pre-dose, 15, 30, 45 minutes, 1 hour, 1 hour 30 minutes, 2, 3, 4, 5, 6, 8, 12 and 24 hours in Period 2 Day 7
Primary	Period 1: AUC (0-tau) of FTC	Blood samples were collected at indicated time-points for analysis of AUC (0-tau). PK parameters were calculated by standard non-compartmental analysis.	Pre-dose, 15, 30, 45 minutes, 1 hour, 1 hour 30 minutes, 2, 3, 4, 5, 6, 8, 12 and 24 hours in Period 1 Day 14
Primary	Period 2: AUC (0-tau) of FTC	Blood samples were collected at indicated time-points for analysis of AUC (0-tau). PK parameters were calculated by standard non-compartmental analysis.	Pre-dose, 15, 30, 45 minutes, 1 hour, 1 hour 30 minutes, 2, 3, 4, 5, 6, 8, 12 and 24 hours in Period 2 Day 7
Primary	Period 1:Cmax of FTC	Blood samples were collected at indicated time-points for analysis of Cmax. PK parameters were calculated by standard non-compartmental analysis.	Pre-dose, 15, 30, 45 minutes, 1 hour, 1 hour 30 minutes, 2, 3, 4, 5, 6, 8, 12 and 24 hours in Period 1 Day 14
Primary	Period 2:Cmax of FTC	Blood samples were collected at indicated time-points for analysis of Cmax. PK parameters were calculated by standard non-compartmental analysis.	Pre-dose, 15, 30, 45 minutes, 1 hour, 1 hour 30 minutes, 2, 3, 4, 5, 6, 8, 12 and 24 hours in Period 2 Day 7
Primary	Period 1: Plasma Concentration at the End of the Dosing Interval (Ctau) of FTC	Blood samples were collected at indicated time-points for analysis of Ctau. PK parameters were calculated by standard non-compartmental analysis.	Pre-dose, 15, 30, 45 minutes, 1 hour, 1 hour 30 minutes, 2, 3, 4, 5, 6, 8, 12 and 24 hours in Period 1 Day 14
Primary	Period 2: Ctau of FTC	Blood samples were collected at indicated time-points for analysis of Ctau. PK parameters were calculated by standard non-compartmental analysis.	Pre-dose, 15, 30, 45 minutes, 1 hour, 1 hour 30 minutes, 2, 3, 4, 5, 6, 8, 12 and 24 hours in Period 2 Day 7
Primary	Period 1: AUC (0-tau) of Tenofovir (TFV)	Blood samples were collected at indicated time-points for analysis of AUC (0-tau). PK parameters were calculated by standard non-compartmental analysis.	Pre-dose, 15, 30, 45 minutes, 1 hour, 1 hour 30 minutes, 2, 3, 4, 5, 6, 8, 12 and 24 hours in Period 1 Day 14
Primary	Period 2: AUC (0-tau) of TFV	Blood samples were collected at indicated time-points for analysis of AUC (0-tau). PK parameters were calculated by standard non-compartmental analysis.	Pre-dose, 15, 30, 45 minutes, 1 hour, 1 hour 30 minutes, 2, 3, 4, 5, 6, 8, 12 and 24 hours in Period 2 Day 7
Primary	Period 1: Cmax of TFV	Blood samples were collected at indicated time-points for analysis of Cmax. PK parameters were calculated by standard non-compartmental analysis.	Pre-dose, 15, 30, 45 minutes, 1 hour, 1 hour 30 minutes, 2, 3, 4, 5, 6, 8, 12 and 24 hours in Period 1 Day 14
Primary	Period 2: Cmax of TFV	Blood samples were collected at indicated time-points for analysis of Cmax. PK parameters were calculated by standard non-compartmental analysis.	Pre-dose, 15, 30, 45 minutes, 1 hour, 1 hour 30 minutes, 2, 3, 4, 5, 6, 8, 12 and 24 hours in Period 2 Day 7
Primary	Period 1: Ctau of TFV	Blood samples were collected at indicated time-points for analysis of Ctau. PK parameters were calculated by standard non-compartmental analysis.	Pre-dose, 15, 30, 45 minutes, 1 hour, 1 hour 30 minutes, 2, 3, 4, 5, 6, 8, 12 and 24 hours in Period 1 Day 14
Primary	Period 2: Ctau of TFV	Blood samples were collected at indicated time-points for analysis of Ctau. PK parameters were calculated by standard non-compartmental analysis.	Pre-dose, 15, 30, 45 minutes, 1 hour, 1 hour 30 minutes, 2, 3, 4, 5, 6, 8, 12 and 24 hours in Period 2 Day 7
Secondary	Number of Participants With Non-serious Adverse Events (Non-SAEs) and Serious Adverse Events (SAE)	An adverse events (AE) is any untoward medical occurrence in a clinical study participant, temporally associated with the use of a study intervention, whether or not considered related to the study intervention. An SAE is defined as any untoward medical occurrence that, at any dose: results in death; is life-threatening; requires inpatient hospitalization or prolongation of existing hospitalization; results in persistent disability/incapacity; is a congenital anomaly/birth defect; other important medical events that may jeopardize the participant or may require medical or surgical intervention to prevent one of the other outcomes listed before	Up to Day 24
Secondary	Period 1: Change From Baseline in Hematology Parameter of Platelet Count, Neutrophils, Lymphocytes, Monocytes, Eosinophils and Basophils	Blood samples were collected at indicated timepoints for analysis of hematology parameters like platelet count, neutrophils, lymphocytes, monocytes, eosinophils and basophils. Baseline was defined as Day -1 for Period 1. Change from Baseline was defined as post-dose visit value minus Baseline value.	Baseline and at Days 7, and 14
Secondary	Period 2: Change From Baseline in Hematology Parameter of Platelet Count, Neutrophils, Lymphocytes, Monocytes, Eosinophils and Basophils	Blood samples were collected at indicated timepoints for analysis for hematology parameters like platelet count, neutrophils, lymphocytes, monocytes, eosinophils and basophils. Baseline was defined as Period 1 Day 14 for Period 2. Change from Baseline was defined as post-dose visit value minus Baseline value.	Baseline and at Days 3, 7, 9
Secondary	Period 1: Absolute Values of the Hematology Parameter of Platelet Count, Neutrophils, Lymphocytes, Monocytes, Eosinophils and Basophils	Blood samples were collected at indicated timepoints for analysis of hematology parameters like platelet count, neutrophils, lymphocytes, monocytes, eosinophils and basophils. Baseline was defined as Day -1 for Period 1.	Baseline and at Days 7, and 14
Secondary	Period 2: Absolute Values of the Hematology Parameter of Platelet Count, Neutrophils, Lymphocytes, Monocytes, Eosinophils and Basophils	Blood samples were collected at indicated timepoints for analysis of hematology parameters like platelet count, neutrophils, lymphocytes, monocytes, eosinophils and basophils. Baseline was defined as Period 1 Day 14 for Period 2.	Baseline and at Days 3, 7, 9
Secondary	Period 1: Change From Baseline in Hematology Parameter of Hematocrit	Blood samples were collected at indicated timepoints for analysis of hematology parameter like hematocrit. Baseline was defined as Day -1 for Period 1. Change from Baseline was defined as post-dose visit value minus Baseline value.	Baseline and at Days 7, 14
Secondary	Period 2: Change From Baseline in Hematology Parameter of Hematocrit	Blood samples were collected at indicated time-points for analysis for hematology parameter like hematocrit. Baseline was defined as Period 1 Day 14 for Period 2. Change from Baseline was defined as post-dose visit value minus Baseline value.	Baseline and at Days 3, 7, 9
Secondary	Period 1: Absolute Values of the Hematology Parameter: Hematocrit	Blood samples were collected at indicated time points for analysis for hematology parameter like hematocrit. Baseline was defined as Day -1 for Period 1.	Baseline and at Days 7, 14
Secondary	Period 2: Absolute Values of the Hematology Parameter: Hematocrit	Blood samples were collected at indicated time-points for analysis for hematology parameter like hematocrit. Baseline was defined as Period 1 Day 14 for Period 2.	Baseline and at Days 3, 7, 9
Secondary	Period 1: Change From Baseline in Hematology Parameter of Hemoglobin	Blood samples were collected at indicated timepoints for analysis for hematology parameter like hemoglobin. Baseline was defined as Day -1 for Period 1. Change from Baseline was defined as post-dose visit value minus Baseline value.	Baseline and at Days 7, 14
Secondary	Period 2: Change From Baseline in Hematology Parameter of Hemoglobin	Blood samples were collected at indicated timepoints for analysis of hematology parameter like hemoglobin. Baseline was defined as Period 1 Day 14 for Period 2. Change from Baseline was defined as post-dose visit value minus Baseline value.	Baseline and at Days 3, 7, 9
Secondary	Period 1: Absolute Values of the Hematology Parameter: Hemoglobin	Blood samples were collected at indicated time-points for analysis for hematology parameter like hemoglobin. Baseline was defined as Day -1 for Period 1.	Baseline and at Days 7, 14
Secondary	Period 2: Absolute Values of the Hematology Parameter: Hemoglobin	Blood samples were collected at indicated time-points for analysis for hematology parameter like hemoglobin. Baseline was defined as Period 1 Day 14 for Period 2.	Baseline and at Days 3, 7, 9
Secondary	Period 1: Change From Baseline in Hematology Parameter of Mean Corpuscle Hemoglobin (MCH)	Blood samples were collected at indicated timepoints for analysis of hematology parameter like MCH. Baseline was defined as Day -1 for Period 1. Change from Baseline was defined as post-dose visit value minus Baseline value.	Baseline and at Days 7, 14
Secondary	Period 2: Change From Baseline in Hematology Parameter of MCH	Blood samples were collected at indicated timepoints for analysis for hematology parameter like MCH. Baseline was defined as Period 1 Day 14 for Period 2. Change from Baseline was defined as post-dose visit value minus Baseline value.	Baseline and at Days 3, 7, 9
Secondary	Period 1: Absolute Values of the Hematology Parameter: MCH	Blood samples were collected at indicated time-points for analysis for hematology parameter like MCH. Baseline was defined as Day -1 for Period 1.	Baseline and at Days 7, 14
Secondary	Period 2: Absolute Values of the Hematology Parameter: MCH	Blood samples were collected at indicated time-points for analysis of hematology parameter like MCH. Baseline was defined as Period 1 Day 14 for Period 2.	Baseline and at Days 3, 7, 9
Secondary	Period 1: Change From Baseline in Hematology Parameter of Mean Corpuscle Volume (MCV)	Blood samples were collected at indicated time-points for analysis for hematology parameter like MCV. Baseline was defined as Day -1 for Period 1. Change from Baseline was defined as post-dose visit value minus Baseline value.	Baseline and at Days 7, 14
Secondary	Period 2: Change From Baseline in Hematology Parameter of MCV	Blood samples were collected at indicated timepoints for analysis for hematology parameter like MCV. Baseline was defined as Period 1 Day 14 for Period 2. Change from Baseline was defined as post-dose visit value minus Baseline value.	Baseline and at Days 3, 7, 9
Secondary	Period 1: Absolute Values of the Hematology Parameter: MCV	Blood samples were collected at indicated time-points for analysis for hematology parameter like MCV. Baseline was defined as Day -1 for Period 1.	Baseline and at Days 7, 14
Secondary	Period 2: Absolute Values of the Hematology Parameter: MCV	Blood samples were collected at indicated time-points for analysis for hematology parameter like MCV. Baseline was defined as Period 1 Day 14 for Period 2.	Baseline and at Days 3, 7, 9
Secondary	Period 1: Change From Baseline in Hematology Parameter of Erythrocytes	Blood samples were collected at indicated time-points for analysis for hematology parameter like erythrocytes. Baseline was defined as Day -1 for Period 1. Change from Baseline was defined as post-dose visit value minus Baseline value.	Baseline and at Days 7, 14
Secondary	Period 2: Change From Baseline in Hematology Parameter of Erythrocytes	Blood samples were collected at indicated time-points for analysis for hematology parameter like erythrocytes. Baseline was defined as Period 1 Day 14 for Period 2. Change from Baseline was defined as post-dose visit value minus Baseline value.	Baseline and at Days 3, 7, 9
Secondary	Period 1: Absolute Values of the Hematology Parameter: Erythrocytes	Blood samples were collected at indicated time-points for analysis for hematology parameter like erythrocytes. Baseline was defined as Day -1 for Period 1.	Baseline and at Days 7, 14
Secondary	Period 2: Absolute Values of the Hematology Parameter: Erythrocytes	Blood samples were collected at indicated time-points for analysis for hematology parameter like erythrocytes. Baseline was defined as Period 1 Day 14 for Period 2.	Baseline and at Days 3, 7, 9
Secondary	Period 1: Change From Baseline in Clinical Chemistry Parameter of Glucose, Anion Gap, Cholesterol, Calcium, Potassium, Sodium, Blood Urea Nitrogen (BUN), Carbon Dioxide (CO2), Chloride and Phosphorus	Blood samples were collected at indicated time-points for analysis for clinical chemistry parameter of glucose, calcium, potassium, sodium, BUN, anion gap, CO2, chloride and phosphorus. Baseline was defined as Day -1 for Period 1. Change from Baseline was defined as post-dose visit value minus Baseline value.	Baseline and at Days 7, 14
Secondary	Period 2: Change From Baseline in Clinical Chemistry Parameter of Glucose, Anion Gap, Cholesterol, Calcium, Potassium, Sodium, BUN, CO2, Chloride and Phosphorus	Blood samples were collected at indicated time-points for analysis for clinical chemistry parameter of glucose, calcium, potassium, sodium, BUN, anion gap, CO2, chloride and phosphorus. Baseline was defined as Period 1 Day 14 for Period 2. Change from Baseline was defined as post-dose visit value minus Baseline value.	Baseline and at Days 3, 7, 9
Secondary	Period 1: Absolute Values of Clinical Chemistry Parameter of Glucose, Anion Gap, Cholesterol, Calcium, Potassium, Sodium, BUN, CO2, Chloride and Phosphorus	Blood samples were collected at indicated time-points for analysis of clinical chemistry parameter of glucose, calcium, potassium, sodium, BUN, anion gap, CO2, chloride and phosphorus. Baseline was defined as Day -1 for Period 1.	Baseline and at Days 7, 14
Secondary	Period 2: Absolute Values of Clinical Chemistry Parameter of Glucose, Anion Gap, Cholesterol, Calcium, Potassium, Sodium, BUN, CO2, Chloride and Phosphorus	Blood samples were collected at indicated time-points for analysis for clinical chemistry parameter of glucose, calcium, potassium, sodium, BUN, anion gap, CO2, chloride and phosphorus. Baseline was defined as Period 1 Day 14 for Period 2.	Baseline and at Days 3, 7, 9
Secondary	Period 1: Change From Baseline in Clinical Chemistry Parameter of Alkaline Phosphatase, Alanine Aminotransferase (ALT), Aspartate Aminotransferase (AST), Lactate Dehydrogenase (LDH), Gamma-glutamyl Transferase (GGT), and Creatine Phosphokinase (CK)	Blood samples were collected at indicated time-points for analysis of clinical chemistry parameter like alkaline phosphatase, ALT, AST, LDH, GGT and CK. Baseline was defined as Day -1 for Period 1. Change from Baseline was defined as post-dose visit value minus Baseline value.	Baseline and at Days 7, 14
Secondary	Period 2: Change From Baseline in Clinical Chemistry Parameter of Alkaline Phosphatase, ALT, AST, LDH, GGT, and CK	Blood samples were collected at indicated time-points for analysis for clinical chemistry parameter of alkaline phosphatase, ALT, AST, LDH, GGT and CK. Baseline was defined as Period 1 Day 14 for Period 2. Change from Baseline was defined as post-dose visit value minus Baseline value.	Baseline and at Days 3, 7, 9
Secondary	Period 1: Absolute Values of Clinical Chemistry Parameter of Alkaline Phosphatase, ALT, AST, LDH, GGT, and CK	Blood samples were collected at indicated time-points for analysis for clinical chemistry parameter of alkaline phosphatase, ALT, AST, LDH, GGT and CK. Baseline was defined as Day -1 for Period 1.	Baseline and at Days 7, 14
Secondary	Period 2: Absolute Values of Clinical Chemistry Parameter of Alkaline Phosphatase, ALT, AST, LDH, GGT, and CK	Blood samples were collected at indicated time-points for analysis for clinical chemistry parameter of alkaline phosphatase, ALT, AST, LDH, GGT and CK. Baseline was defined as Period 1 Day 14 for Period 2.	Baseline and at Days 3, 7, 9
Secondary	Period 1: Change From Baseline in Clinical Chemistry Parameter of Lipase and Amylase	Blood samples were collected at indicated time-points for analysis for clinical chemistry parameter of lipase and amylase. Baseline was defined as Day -1 for Period 1. Change from Baseline was defined as post-dose visit value minus Baseline value.	Baseline and at Days 7, 14
Secondary	Period 2: Change From Baseline in Clinical Chemistry Parameter of Lipase and Amylase	Blood samples were collected at indicated time-points for analysis for clinical chemistry parameter of lipase and amylase. Baseline was defined as Period 1 Day 14 for Period 2. Change from Baseline was defined as post-dose visit value minus Baseline value.	Baseline and at Days 3, 7, 9
Secondary	Period 1: Absolute Values of Chemistry Parameters of Lipase and Amylase	Blood samples were collected at indicated time-points for analysis for clinical chemistry parameter of lipase and amylase. Baseline was defined as Day -1 for Period 1.	Baseline and at Days 7, 14
Secondary	Period 2: Absolute Values of Chemistry Parameters of Lipase and Amylase	Blood samples were collected at indicated time-points for analysis for clinical chemistry parameter of lipase and amylase. Baseline was defined as Period 1 Day 14 for Period 2.	Baseline and at Days 3, 7, 9
Secondary	Period 1: Change From Baseline in Clinical Chemistry Parameter of Total Bilirubin, Direct Bilirubin, and Creatinine	Blood samples were collected at indicated time-points for analysis for clinical chemistry parameter of total bilirubin, direct bilirubin, and creatinine. Baseline was defined as Day -1 for Period 1. Change from Baseline was defined as post-dose visit value minus Baseline value.	Baseline and at Days 7, 14
Secondary	Period 2: Change From Baseline in Clinical Chemistry Parameter of Total Bilirubin, Direct Bilirubin, and Creatinine	Blood samples were collected at indicated time-points for analysis for clinical chemistry parameter of total bilirubin, direct bilirubin, and creatinine. Baseline was defined as Period 1 Day 14 for Period 2. Change from Baseline was defined as post-dose visit value minus Baseline value.	Baseline and at Days 3, 7, 9
Secondary	Period 1: Absolute Values of Clinical Chemistry Parameter of Total Bilirubin, Direct Bilirubin, and Creatinine	Blood samples were collected at indicated time-points for analysis for clinical chemistry parameter of total bilirubin, direct bilirubin, and creatinine. Baseline was defined as Day -1 for Period 1.	Baseline and at Days 7, 14
Secondary	Period 2: Absolute Values of Clinical Chemistry Parameter of Total Bilirubin, Direct Bilirubin, and Creatinine	Blood samples were collected at indicated time-points for analysis for clinical chemistry parameter of total bilirubin, direct bilirubin, creatinine and uric acid. Baseline was defined as Period 1 Day 14 for Period 2.	Baseline and at Days 3, 7, 9
Secondary	Period 1: Change From Baseline in Clinical Chemistry Parameter of Total Protein, Albumin and Globulin	Blood samples were collected at indicated time-points for analysis for clinical chemistry parameter of of total protein, albumin and globulin. Baseline was defined as Day -1 for Period 1. Change from Baseline was defined as post-dose visit value minus Baseline value.	Baseline and at Days 7, 14
Secondary	Period 2: Change From Baseline in Clinical Chemistry Parameter of Total Protein, Albumin and Globulin	Blood samples were collected at indicated time-points for analysis for clinical chemistry parameter of total protein, albumin and globulin. Baseline was defined as Period 1 Day 14 for Period 2. Change from Baseline was defined as post-dose visit value minus Baseline value.	Baseline and at Days 3, 7, 9
Secondary	Period 1: Absolute Values of Clinical Chemistry Parameter of Total Protein, Albumin and Globulin	Blood samples were collected at indicated time-points for analysis for clinical chemistry parameter of total protein, albumin and globulin. Baseline was defined as Day -1 for Period 1.	Baseline and at Days 7, 14
Secondary	Period 2: Absolute Values of Clinical Chemistry Parameter of Total Protein, Albumin and Globulin	Blood samples were collected at indicated time-points for analysis for clinical chemistry parameter of total bilirubin, direct bilirubin, creatinine and uric acid. Baseline was defined as Period 1 Day 14 for Period 2.	Baseline and at Days 3, 7, 9
Secondary	Period 1: Change From Baseline in Specific Gravity of Urine	Urine samples were collected at indicated time points for the assessment of specific gravity. Urine specific gravity is a measure of the concentration of solutes in the urine and provides information on the kidney's ability to concentrate urine. The concentration of the excreted molecules determines the urine's specific gravity. Baseline was defined as Day -1 for Period 1. Change from Baseline was defined as post-dose visit value minus Baseline value.	Baseline and at Days 7, 14
Secondary	Period 2: Change From Baseline in Specific Gravity of Urine	Urine samples were collected at indicated time points for the assessment of specific gravity. Urine specific gravity is a measure of the concentration of solutes in the urine and provides information on the kidney's ability to concentrate urine. The concentration of the excreted molecules determines the urine's specific gravity. Baseline was defined as Period 1 Day 14 for Period 2. Change from Baseline was defined as post-dose visit value minus Baseline value.	Baseline and at Days 3, 7, 9
Secondary	Period 1: Absolute Values of Specific Gravity of Urine	Urine samples were collected at indicated time points for the assessment of specific gravity. Urine specific gravity is a measure of the concentration of solutes in the urine and provides information on the kidney's ability to concentrate urine. The concentration of the excreted molecules determines the urine's specific gravity. Baseline was defined as Day -1 for Period 1.	Baseline and at Days 7, 14
Secondary	Period 2: Absolute Values of Specific Gravity of Urine	Urine samples were collected at indicated time points for the assessment of specific gravity. Urine specific gravity is a measure of the concentration of solutes in the urine and provides information on the kidney's ability to concentrate urine. The concentration of the excreted molecules determines the urine's specific gravity. Baseline was defined as Period 1 Day 14 for Period 2.	Baseline and at Days 3, 7, 9
Secondary	Period 1: Change From Baseline in Potential of Hydrogen (pH) of Urine	Urine samples were collected at indicated time points for the assessment of Urinary pH. Urine pH is an acid-base measurement. pH is measured on a numeric scale ranging from 0 to 14; values on the scale refer to the degree of alkalinity or acidity. A pH of 7 is neutral. A pH less than 7 is acidic, and a pH greater than 7 is basic. Normal urine has a slightly acid pH (5.0 - 6.0). Baseline was defined as Day -1 for Period 1. Change from Baseline was defined as post-dose visit value minus Baseline value.	Baseline and at Days 7, 14
Secondary	Period 2: Change From Baseline in pH of Urine	Urine samples were collected at indicated time points for the assessment of Urinary pH. Urine pH is an acid-base measurement. pH is measured on a numeric scale ranging from 0 to 14; values on the scale refer to the degree of alkalinity or acidity. A pH of 7 is neutral. A pH less than 7 is acidic, and a pH greater than 7 is basic. Normal urine has a slightly acid pH (5.0 - 6.0). Baseline was defined as Period 1 Day 14 for Period 2. Change from Baseline was defined as post-dose visit value minus Baseline value.	Baseline and at Days 3, 7, 9
Secondary	Period 1: Absolute Values of pH of Urine	Urine samples were collected at indicated time points for the assessment of Urinary pH. Urine pH is an acid-base measurement. pH is measured on a numeric scale ranging from 0 to 14; values on the scale refer to the degree of alkalinity or acidity. A pH of 7 is neutral. A pH less than 7 is acidic, and a pH greater than 7 is basic. Normal urine has a slightly acid pH (5.0 - 6.0). Baseline was defined as Day -1 for Period 1.	Baseline and at Days 7, 14
Secondary	Period 2: Absolute Values of pH of Urine	Urine samples were collected at indicated time points for the assessment of Urinary pH. Urine pH is an acid-base measurement. pH is measured on a numeric scale ranging from 0 to 14; values on the scale refer to the degree of alkalinity or acidity. A pH of 7 is neutral. A pH less than 7 is acidic, and a pH greater than 7 is basic. Normal urine has a slightly acid pH (5.0 - 6.0). Baseline was defined as Period 1 Day 14 for Period 2.	Baseline and at Days 3, 7, 9
Secondary	Period 1: Change From Baseline in Urine Urobilinogen	Urine samples were collected at indicated time points for the assessment of urine urobilinogen. Baseline was defined as Day -1 for Period 1. Change from Baseline was defined as post-dose visit value minus Baseline value.	Baseline and at Days 7, 14
Secondary	Period 2: Change From Baseline in Urine Urobilinogen	Urine samples were collected at indicated time points for the assessment of urine urobilinogen. Baseline was defined as Period 1 Day 14 for Period 2. Change from Baseline was defined as post-dose visit value minus Baseline value.	Baseline and at Days 3, 7, 9
Secondary	Period 1: Absolute Values of Urine Urobilinogen	Urine samples were collected at indicated time points for the assessment of urine urobilinogen. Baseline was defined as Day -1 for Period 1.	Baseline and at Days 7, 14
Secondary	Period 2: Absolute Values of Urine Urobilinogen	Urine samples were collected at indicated time points for the assessment of urine urobilinogen. Baseline was defined as Period 1 Day 14 for Period 2.	Baseline and at Days 3, 7, 9
Secondary	Period 1: Change From Baseline in Heart Rate	Urine samples were collected at indicated time points for the assessment of urine urobilinogen. Baseline was defined as Day -1 for Period 1. Change from Baseline was defined as post-dose visit value minus Baseline value.	Baseline and at Day 1, 2 and 4 hours post-dose
Secondary	Period 2: Change From Baseline in Heart Rate	Twelve-lead ECGs was performed with the participant in a supine or semi-supine position after a rest of at least 10 minutes using an automated ECG machine to measure heart rate. Baseline was defined as Day 1 (Pre-dose) for each Period. Change from Baseline was defined as post-dose visit value minus Baseline value.	Baseline and at Day 1, 2 and 4 hours post-dose; Day 4, Pre-dose, 2 and 4 hours post-dose; Day 7, Pre-dose, 2 and 4 hours post-dose; Day 9 post-dose
Secondary	Period 1: Absolute Values of Heart Rate	Twelve-lead ECGs was performed with the participant in a supine or semi-supine position after a rest of at least 10 minutes using an automated ECG machine to measure heart rate. Baseline was defined as Day 1 (Pre-dose) for each Period. Change from Baseline was defined as post-dose visit value minus Baseline value.	Baseline and at Day 1, 2 and 4 hours post-dose
Secondary	Period 2: Absolute Values of Heart Rate	Twelve-lead ECGs was performed with the participant in a supine or semi-supine position after a rest of at least 10 minutes using an automated ECG machine to measure heart rate. Baseline was defined as Day 1 (Pre-dose) for each Period.	Baseline and at Day 1, 2 and 4 hours post-dose; Day 4, Pre-dose, 2 and 4 hours post-dose; Day 7, Pre-dose, 2 and 4 hours post-dose; Day 9 post-dose
Secondary	Period 1: Change From Baseline in ECG Parameters: PR Interval, QRS Duration, QT Interval, Fridericia QT Correction Formula (QTcF) Interval, and Bazett QT Correction Formula (QTcB) Interval	Twelve-lead ECGs was performed with the participant in a supine or semi-supine position after a rest of at least 10 minutes using an automated ECG machine to measure PR interval, QRS duration, QT Interal, QTcF Interval and QTcB interval. Baseline was defined as Day 1 (Pre-dose) for each Period. Change from Baseline was defined as post-dose visit value minus Baseline value.	Baseline and at Day 1, 2 and 4 hours post-dose
Secondary	Period 2: Change From Baseline in ECG Parameters: PR Interval, QRS Duration, QT Interval, QTcF Interval, and QTcB Interval	Twelve-lead ECGs was performed with the participant in a supine or semi-supine position after a rest of at least 10 minutes using an automated ECG machine to measure PR interval, QRS duration, QT Interal, QTcF Interval and QTcB interval. Baseline was defined as Day 1 (Pre-dose) for each Period. Change from Baseline was defined as post-dose visit value minus Baseline value.	Baseline and at Day 1, 2 and 4 hours post-dose; Day 4, Pre-dose, 2 and 4 hours post-dose; Day 7, Pre-dose, 2 and 4 hours post-dose; Day 9 post-dose
Secondary	Period 1: Absolute Values of ECG Parameters: PR Interval, QRS Duration, QT Interval, QTcF Interval, and QTcB Interval	Twelve-lead ECGs was performed with the participant in a supine or semi-supine position after a rest of at least 10 minutes using an automated ECG machine to measure PR interval, QRS duration, QT Interval, QTcF Interval and QTcB interval. Baseline was defined as Day 1 (Pre-dose) for each Period.	Baseline and at Day 1, 2 and 4 hours post-dose
Secondary	Period 2: Absolute Values of ECG Parameters: PR Interval, QRS Duration, QT Interval, QTcF Interval, and QTcB Interval	Twelve-lead ECGs was performed with the participant in a supine or semi-supine position after a rest of at least 10 minutes using an automated ECG machine to measure PR interval, QRS duration, QT Interval, QTcF Interval and QTcB interval. Baseline was defined as Day 1 (Pre-dose) for each Period.	Baseline and at Day 1, 2 and 4 hours post-dose; Day 4, Pre-dose, 2 and 4 hours post-dose; Day 7, Pre-dose, 2 and 4 hours post-dose; Day 9 post-dose
Secondary	Period 1: Change From Baseline in Temperature	Temperature was assessed at indicated time-points. Baseline was defined as Day 1 (Pre-dose) for each Period. Change from Baseline was defined as post-dose visit value minus Baseline value.	Baseline and at Days 2, 3, 4, 5 and 7
Secondary	Period 2: Change From Baseline in Temperature	Temperature was assessed at indicated time-points. Baseline was defined as Day 1 (Pre-dose) for each Period. Change from Baseline was defined as post-dose visit value minus Baseline value.	Baseline and at Days 4, 7, 9, and 10
Secondary	Period 1: Absolute Values of Temperature	Temperature was assessed at indicated time-points. Baseline was defined as Day 1 (Pre-dose) for each Period.	Baseline and at Days 2, 3, 4, 5 and 7
Secondary	Period 2: Absolute Values of Temperature	Temperature was assessed at indicated time-points. Baseline was defined as Day 1 (Pre-dose) for each Period.	Baseline and at Days 4, 7, 9, and 10
Secondary	Period 1: Change From Baseline in Pulse Rate	Pulse rate was assessed in the semi-recumbent position with a completely automated device at indicated time-points. Baseline was defined as Day 1 (Pre-dose) for each Period. Change from Baseline was defined as post-dose visit value minus Baseline value.	Baseline and at Days 2, 3, 4, 5 and 7
Secondary	Period 2: Change From Baseline in Pulse Rate	Pulse rate was assessed in the semi-recumbent position with a completely automated device at indicated time-points. Baseline was defined as Day 1 (Pre-dose) for each Period. Change from Baseline was defined as post-dose visit value minus Baseline value.	Baseline and at Days 4, 7, 9, and 10
Secondary	Period 1: Absolute Values of Pulse Rate	Pulse rate was assessed in the semi-recumbent position with a completely automated device at indicated time-points. Baseline was defined as Day 1 (Pre-dose) for each Period.	Baseline and at Days 2, 3, 4, 5 and 7
Secondary	Period 2: Absolute Values of Pulse Rate	Pulse rate was assessed in the semi-recumbent position with a completely automated device at indicated time-points. Baseline was defined as Day 1 (Pre-dose) for each Period.	Baseline and at Days 4, 7, 9, and 10
Secondary	Period 1: Change From Baseline in Respiratory Rate	Respiratory rate was assessed at indicated time-points. Baseline was defined as Day 1 (Pre-dose) for each Period. Change from Baseline was defined as post-dose visit value minus Baseline value.	Baseline and at Days 2, 3, 4, 5 and 7
Secondary	Period 2: Change From Baseline in Respiratory Rate	Respiratory rate was assessed at indicated time-points. Baseline was defined as Day 1 (Pre-dose) for each Period. Change from Baseline was defined as post-dose visit value minus Baseline value.	Baseline and at Days 4, 7, 9, and 10
Secondary	Period 1: Absolute Values of Respiratory Rate	Respiratory rate was assessed at indicated time-points. Baseline was defined as Day 1 (Pre-dose) for each Period.	Baseline and at Days 2, 3, 4, 5 and 7
Secondary	Period 2: Absolute Values of Respiratory Rate	Respiratory rate was assessed at indicated time-points. Baseline was defined as Day 1 (Pre-dose) for each Period.	Baseline and at Days 4, 7, 9, and 10
Secondary	Period 1: Change From Baseline in Blood Pressure	Systolic blood pressure (SBP) and diastolic blood pressure (DBP) was assessed in the semi-recumbent position with a completely automated device at indicated time-points. Baseline was defined as Day 1 (Pre-dose) for each Period. Change from Baseline was defined as post-dose visit value minus Baseline value.	Baseline and at Days 2, 3, 4, 5 and 7
Secondary	Period 2: Change From Baseline in Blood Pressure	SBP and DBP was assessed in the semi-recumbent position with a completely automated device at indicated time-points. Baseline was defined as Day 1 (Pre-dose) for each Period. Change from Baseline was defined as post-dose visit value minus Baseline value.	Baseline and at Days 4, 7, 9, and 10
Secondary	Period 1: Absolute Values of Blood Pressure	SBP and DBP was assessed in the semi-recumbent position with a completely automated device at indicated time-points. Baseline was defined as Day 1 (Pre-dose) for each Period.	Baseline and at Days 2, 3, 4, 5 and 7
Secondary	Period 2: Absolute Values of Blood Pressure	SBP and DBP was assessed in the semi-recumbent position with a completely automated device at indicated time-points. Baseline was defined as Day 1 (Pre-dose) for each Period.	Baseline and at Days 4, 7, 9, and 10
Secondary	Period 2: AUC (0-tau) of GSK3640254	Blood samples were collected at indicated time-points for analysis of AUC (0-tau). PK parameters were calculated by standard non-compartmental analysis.	Pre-dose, 1 and 2hours, 2 hours 30 minutes, 3 and 3 hour 30 minutes, 4 and 4 hour 30 minutes, 5, 6, 8, 12 and 24 hours in Period 2 Day 7
Secondary	Period 2: Cmax of GSK3640254	Blood samples were collected at indicated time-points for analysis of Cmax. PK parameters were calculated by standard non-compartmental analysis.	Pre-dose, 1 and 2hours, 2 hours 30 minutes, 3 and 3 hour 30 minutes, 4 and 4 hour 30 minutes, 5, 6, 8, 12 and 24 hours in Period 2 Day 7
Secondary	Period 2: Ctau of GSK3640254	Blood samples were collected at indicated time-points for analysis of Ctau. PK parameters were calculated by standard non-compartmental analysis.	Pre-dose, 1 and 2 hours, 2 hours 30 minutes, 3 and 3 hour 30 minutes, 4 and 4 hour 30 minutes, 5, 6, 8, 12 and 24 hours in Period 2 Day 7
Secondary	Period 2: Time of Maximum Observed Concentration (Tmax) of GSK3640254	Blood samples were collected at indicated time-points for analysis of Tmax. PK parameters were calculated by standard non-compartmental analysis.	Pre-dose, 1 and 2hours, 2 hours 30 minutes, 3 and 3 hour 30 minutes, 4 and 4 hour 30 minutes, 5, 6, 8, 12 and 24 hours in Period 2 Day 7
Secondary	Period 1: Tmax of TAF	Blood samples were collected at indicated time-points for analysis of Tmax. PK parameters were calculated by standard non-compartmental analysis.	Pre-dose, 15, 30, 45 minutes, 1 hour, 1 hour 30 minutes, 2, 3, 4, 5, 6, 8, 12 and 24 hours in Period 1 Day 14
Secondary	Period 2: Tmax of TAF	Blood samples were collected at indicated time-points for analysis of Tmax. PK parameters were calculated by standard non-compartmental analysis.	Pre-dose, 15, 30, 45 minutes, 1 hour, 1 hour 30 minutes, 2, 3, 4, 5, 6, 8, 12 and 24 hours in Period 2 Day 7
Secondary	Period 1: Tmax of FTC	Blood samples were collected at indicated time-points for analysis of Tmax. PK parameters were calculated by standard non-compartmental analysis.	Pre-dose, 15, 30, 45 minutes, 1 hour, 1 hour 30 minutes, 2, 3, 4, 5, 6, 8, 12 and 24 hours in Period 1 Day 14
Secondary	Period 2: Tmax of FTC	Blood samples were collected at indicated time-points for analysis of Tmax. PK parameters were calculated by standard non-compartmental analysis.	Pre-dose, 15, 30, 45 minutes, 1 hour, 1 hour 30 minutes, 2, 3, 4, 5, 6, 8, 12 and 24 hours in Period 2 Day 7
Secondary	Period 1: Tmax of TFV	Blood samples were collected at indicated time-points for analysis of Tmax. PK parameters were calculated by standard non-compartmental analysis.	Pre-dose, 15, 30, 45 minutes, 1 hour, 1 hour 30 minutes, 2, 3, 4, 5, 6, 8, 12 and 24 hours in Period 1 Day 14
Secondary	Period 2: Tmax of TFV	Blood samples were collected at indicated time-points for analysis of Tmax. PK parameters were calculated by standard non-compartmental analysis.	Pre-dose, 15, 30, 45 minutes, 1 hour, 1 hour 30 minutes, 2, 3, 4, 5, 6, 8, 12 and 24 hours in Period 2 Day 7