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GSK3036656

Phase 2

Tuberculosis | Small molecule | Infectious Disease |GSK plc|Last Updated: Jun 17, 2026

Success Probability

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Trial Design

RandomizedDouble-BlindPLACEBO_CONTROLLED
Total Trials3
Total Enrollment233

FDA Designations

No designations recorded

Clinical trial landscape

GSK3036656 · 3 trials · 1 indication

Phase 2 2Phase 1 1
NCT05382312Early Bactericidal Activity, Safety & Tolerability of Oral GSK3036656 in a Dual Combination With Novel and Established Antitubercular Agents, or Standard of Care in Adults With Rifampicin Susceptible Pulmonary TuberculosisTuberculosis
COMPLETED127 Analytics
NCT03557281An Early Bactericidal Activity, Safety and Tolerability of GSK3036656 in Subjects With Drug-sensitive Pulmonary TuberculosisTuberculosis
COMPLETED76 Analytics
PHASE2COMPLETED
Early Bactericidal Activity, Safety & Tolerability of Oral GSK3036656 in a Dual Combination With Novel and Established Antitubercular Agents, or Standard of Care in Adults With Rifampicin Susceptible Pulmonary Tuberculosis
TuberculosisUnlock trial analytics
PHASE2COMPLETED
An Early Bactericidal Activity, Safety and Tolerability of GSK3036656 in Subjects With Drug-sensitive Pulmonary Tuberculosis
TuberculosisUnlock trial analytics

Study Endpoints

Primary Endpoints

Change From Baseline in log10 Colony Forming Units (CFU) of Mycobacterium Tuberculosis (MTB)
At Baseline and at days 1, 2, 3, 4, 6, 8, 10, 12 and 14

Baseline was defined as the mean of Day -2 and Day -1. If data was available at only one of these timepoints, then that value was used as baseline.

Change in log10 Colony Forming Units (CFU) Per (/) Milliliter (mL) of Direct Respiratory Sputum Samples From Baseline to Day 14
Baseline and up to Day 14

The Early Bactericidal Activity was determined by change in log10CFU/mL of sputum over the period Baseline to Day 14. Log(CFU) was calculated as: Log(CFU/mL)=log10(mean\[Total count 1:Total Count 2\]\*2\*5\*10\^Dilution); where total counts 1 and 2 were bacterial counts from plates 1 and 2 respectively; \*2 represents the 1:1 dilution of the original specimen and \*5 represents the 0.2 mL (200 microliter) inoculation of the specimen; Dilution is the dilution factor for that plate. Baseline (Day 0) was defined as the mean of Day -2 and Day -1; if data was available at only one of these timepoints then that value was used as Baseline.

Number of Participants With Non-serious Adverse Events (nSAE) and Serious Adverse Events (SAEs) for Part A
Up to 12 weeks

An AE is any untoward medical occurrence in a clinical study participant, temporally associated with the use of a study treatment, whether or not considered related to the study treatment. An SAE is defined as any untoward medical occurrence that results in death, is life-threatening, requires hospitalization or prolongation of existing hospitalization, results in disability/incapacity, is a congenital anomaly/birth defect, other situations judged by physician, such as important medical events that may not be immediately life-threatening or result in death or hospitalization but may jeopardize the participant or may require medical or surgical intervention to prevent one of the other outcomes listed in the above. Safety Population comprised of all randomized participants who received at least one dose of study medication.

Number of Participants With nSAE and SAEs for Part B
Up to 8 weeks

An AE is any untoward medical occurrence in a clinical study participant, temporally associated with the use of a study treatment, whether or not considered related to the study treatment. An SAE is defined as any untoward medical occurrence that results in death, is life-threatening, requires hospitalization or prolongation of existing hospitalization, results in disability/incapacity, is a congenital anomaly/birth defect, other situations judged by physician, such as important medical events that may not be immediately life-threatening or result in death or hospitalization but may jeopardize the participant or may require medical or surgical intervention to prevent one of the other outcomes listed in the above.

Number of Participants With Abnormal Electrocardiogram (ECG) Findings for Part A
Up to 6 weeks

12-lead ECGs were collected during the study using an ECG machine that automatically calculated the heart rate and measures PR, QRS, QT, and QT interval corrected for heart rate using Fridericia's formula (QTcF) intervals. At each time point at which triplicate ECGs were required, three individual ECG tracings were obtained as closely as possible in succession, but no more than 2 to 5 minutes apart. ECG findings were categorized as normal, abnormal not clinically significant (A-NCS) and abnormal clinically significant (A-CS). Only A-NCS and A-CS worst case post-Baseline values have been presented. Only those participants with data available at the indicated time point were analyzed.

Number of Subjects With Clinically Relevant Changes in ECG in Part B
Up to 8 weeks

12-lead ECGs were collected during the study using an ECG machine that automatically calculated the heart rate and measured PR, QRS, QT interval and QTcF intervals. At each time point at which triplicate ECGs were required, three individual ECG tracings were obtained as closely as possible in succession, but no more than 2 to 5 minutes apart. ECG findings were categorized as normal, A-NCS and A-CS. Only A-NCS and A-CS worst case post-Baseline values have been presented.

Number of Participants With Abnormal Cardiac Telemetry Findings for Part A
25 hours for each period

Continuous cardiac telemetry was performed from approximately 1 hour pre-dose to 24 hours post dosing . Number of participants who had abnormal findings upon cardiac telemetry assessment have been presented.

Number of Participants With Abnormal Cardiac Telemetry Findings for Part B
25 hours for each period

Continuous cardiac telemetry was performed from approximately 1 hour pre-dose to 24 hours post dosing . Number of participants who had abnormal findings upon cardiac telemetry assessment have been presented.

Number of Participants With Vital Sign Parameters Systolic Blood Pressure (SBP) and Diastolic Blood Pressure (DBP) of Potential Clinical Importance (PCI) for Part A
Up to 6 weeks

SBP and DBP were assessed in supine position with a completely automated device. Measurements were preceded by at least 5 minutes of rest for the participant in a quiet setting without distractions (e.g., television, cell phones). The PCI range for SBP was less than 85 mmHg (lower) and greater than 160 mmHg (upper) while that for DBP was less than 45 mmHg (lower) and greater than 100 mmHg (upper).

Number of Participants With Vital Sign Parameters SBP and DBP of PCI for Part B
Up to 8 weeks

SBP and DBP were assessed in supine position with a completely automated device. Measurements were preceded by at least 5 minutes of rest for the participant in a quiet setting without distractions (e.g., television, cell phones). The PCI range for SBP was less than 85 mmHg (lower) and greater than 160 mmHg (upper) while that for DBP was less than 45 mmHg (lower) and greater than 100 mmHg (upper).

Number of Participants With Vital Sign Parameter Heart Rate of PCI for Part A
Up to 6 weeks

Heart rate was assessed in supine position with a completely automated device. Measurements were preceded by at least 5 minutes of rest for the participant in a quiet setting without distractions (e.g., television, cell phones). The PCI range for heart was less than 40 bpm (lower) and greater than 110 bpm (upper).

Number of Participants With Vital Sign Parameter Heart Rate of PCI for Part B
Up to 8 weeks

Heart rate was assessed in supine position with a completely automated device. Measurements were preceded by at least 5 minutes of rest for the participant in a quiet setting without distractions (e.g., television, cell phones). The PCI range for heart was less than 40 bpm (lower) and greater than 110 bpm (upper).

Number of Participants With Vital Sign Parameter Temperature of PCI for Part A
Up to 6 weeks

Number of participants with temperature data of PCI have been presented.

Number of Participants With Vital Sign Parameter Temperature of PCI for Part B
Up to 8 weeks

Number of participants with temperature data of PCI have been presented.

Number of Participants With Clinical Chemistry Parameters of PCI for Part A
Up to 12 weeks

Blood samples were collected for the assessment of clinical chemistry parameters namely blood urea nitrogen (BUN), creatinine, glucose, cholesterol, potassium, sodium, calcium, aspartate amino transferase (AST), alanine amino transferase (ALT), alkaline phosphatase, triglycerides, total and direct bilirubin, total protein, albumin and troponin. Only categories with PCI values have been presented, therefore only AST is presented.

Number of Participants With Clinical Chemistry Parameters of PCI for Part B
Up to 8 weeks

Blood samples were collected for the assessment of clinical chemistry parameters namely BUN, creatinine, glucose, cholesterol, potassium, sodium, calcium, AST, ALT, alkaline phosphatase, triglycerides, total and direct bilirubin, total protein, albumin and troponin. Only categories with PCI values have been presented.

Number of Participants With Hematology Parameters of PCI for Part A
Up to 12 weeks

Blood samples were collected for the assessment of hematology parameters platelet count, red blood cell count, hemoglobin, hematocrit, reticulocytes, mean corpuscle volume, mean corpuscular hemoglobin, neutrophils, lymphocytes, monocytes, basophils and eosinophils. Only categories with PCI values have been presented.

Number of Participants With Hematology Parameters of PCI for Part B
Up to 8 weeks

Blood samples were collected for the assessment of hematology parameters platelet count, red blood cell count, hemoglobin, hematocrit, reticulocytes, mean corpuscle volume, mean corpuscular hemoglobin, neutrophils, lymphocytes, monocytes, basophils and eosinophils. Only categories with PCI values have been presented.

Number of Participants With Abnormal Urinalysis Parameters for Part A
Up to 72 hours post-dose

Urinalysis included dipstick urine test which was used to screen for glucose, ketones, occult blood and protein up to 72 hours post dose. The dipstick test gives results in a semi-quantitative manner, and results for urinalysis parameters of urine glucose, ketones, occult blood and protein can be read as negative, trace, trace-intact, trace-lysed,1+ and 2+ indicating proportional concentrations in the urine sample. Only categories with non-negative values have been presented. Only those participants with data available the indicated time points were analyzed.

Urine Potential of Hydrogen (pH) Analysis by Dipstick Method for Part A
Up to 72 hours post-dose

Urinary pH measurement is a routine part of urinalysis. 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). Urine samples were collected for the measurement of urine pH by method up to 72 hours in Part A. Only those participants with data available at the indicated time points were analyzed.

Number of Participants With Abnormal Urinalysis Parameters for Part B
Up to 8 weeks

Urinalysis included dipstick urine test which was used to screen for glucose, ketones, occult blood and protein up to 14 days post dose The dipstick test gives results in a semi-quantitative manner, and results for urinalysis parameters of urine glucose, ketones, occult blood and protein can be read as negative, trace, trace-intact, trace-lysed, 1+ and 2+ indicating proportional concentrations in the urine sample. Only categories with non-negative values have been presented. Only those participants available at the specified time points were analyzed represented by n=x in the category titles. Period 1 = Cohort 1 in Part B, Period 2 = Cohort 2 in Part B.

Urine pH Analysis by Dipstick Method for Part B
Up to 8 weeks

Urinary pH measurement is a routine part of urinalysis. 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). Urine samples were collected for the measurement of urine pH by method up to 8 weeks in Part B. Only those participants available at the specified time points were analyzed represented by n=x in the category titles. Period 1 = Cohort 1 in Part B, Period 2 = Cohort 2 in Part B.

Area Under the Plasma Concentration-time Curve (AUC) From Time Zero to the Time of Last Quantifiable Concentration (AUC[0-t]) Following Single Dose Administration of GSK3036656 for Part A
Pre-dose and at 0.25, 0.5, 0.75, 1, 1.5, 2, 3, 4, 6, 8, 12, 15, 24, 36, 48 and 72 hour post-dose on Day 1 in each period

Blood samples for plasma PK analysis of GSK3036656 was collected into K3 Ethylenediaminetetraacetic acid (EDTA) tubes at Pre-dose and at 0.25, 0.5, 0.75, 1, 1.5, 2, 3, 4, 6, 8, 12, 15, 24, 36, 48 and 72 hour post-dose on Day 1 in each period. The actual date and time of each blood sample collection was recorded. PK population comprised of participants in the Safety population who administered at least one dose of active treatment and had at least one evaluable PK sample.

AUC From Time Zero Extrapolated to Infinite Time (AUC[0-infinity]) of GSK3036656 Following Single Dose Administration for Part A
Pre-dose and at 0.25, 0.5, 0.75, 1, 1.5, 2, 3, 4, 6, 8, 12, 15, 24, 36, 48 and 72 hour post-dose on Day 1 in each period

Cmax will be derived from the PK samples collected at the indicated time points Blood samples for plasma PK analysis of GSK3036656 was collected into K3 EDTA tubes at Pre-dose and at 0.25, 0.5, 0.75, 1, 1.5, 2, 3, 4, 6, 8, 12, 15, 24, 36, 48 and 72 hour post-dose on Day 1 in each period. The actual date and time of each blood sample collection was recorded.

Maximum Observed Plasma Drug Concentration (Cmax) of GSK3036656 Following Single Dose Administration for Part A
Pre-dose and at 0.25, 0.5, 0.75, 1, 1.5, 2, 3, 4, 6, 8, 12, 15, 24, 36, 48 and 72 hour post-dose on Day 1 in each period

Blood samples for plasma PK analysis of GSK3036656 was collected into K3 EDTA tubes at Pre-dose and at 0.25, 0.5, 0.75, 1, 1.5, 2, 3, 4, 6, 8, 12, 15, 24, 36, 48 and 72 hour post-dose on Day 1 in each period. The actual date and time of each blood sample collection was recorded.

Time to Maximum Observed Plasma Drug Concentration (Tmax) of GSK3036656 Following Single Dose Administration for Part A
Pre-dose and at 0.25, 0.5, 0.75, 1, 1.5, 2, 3, 4, 6, 8, 12, 15, 24, 36, 48 and 72 hour post-dose on Day 1 in each period

Blood samples for plasma PK analysis of GSK3036656 was collected into K3 EDTA tubes at Pre-dose and at 0.25, 0.5, 0.75, 1, 1.5, 2, 3, 4, 6, 8, 12, 15, 24, 36, 48 and 72 hour post-dose on Day 1 in each period. The actual date and time of each blood sample collection was recorded.

Apparent Terminal Half-life (t1/2) of GSK3036656 Following Single Dose Administration for Part A
Pre-dose and at 0.25, 0.5, 0.75, 1, 1.5, 2, 3, 4, 6, 8, 12, 15, 24, 36, 48 and 72 hour post-dose on Day 1 in each period

Blood samples for plasma PK analysis of GSK3036656 was collected into K3 EDTA tubes at Pre-dose and at 0.25, 0.5, 0.75, 1, 1.5, 2, 3, 4, 6, 8, 12, 15, 24, 36, 48 and 72 hour post-dose on Day 1 in each period. The actual date and time of each blood sample collection was recorded.

AUC[0-t] Following Repeated Dose Administration of GSK3036656 for Part B
Pre-dose and at 0.25, 0.5, 0.75, 1, 1.5, 2, 3, 4, 6, 8, 12, 15, 24, 36, 48 and 72 hour post-dose on Day 1

Blood samples for plasma PK analysis of GSK3036656 was collected into K3 EDTA tubes at Pre-dose and at 0.25, 0.5, 0.75, 1, 1.5, 2, 3, 4, 6, 8, 12, 15, 24, 36, 48 and 72 hour post-dose on Day 1. The actual date and time of each blood sample collection was recorded. Results presented are for Day 1.

AUC From Time Zero During a Dosing Interval of Duration Tau (AUC[0-tau]) of GSK3036656 Following Repeated Dose Administration for Part B
Pre-dose and at 0.25, 0.5, 0.75, 1, 1.5, 2, 3, 4, 6, 8, 12, 15, 24, 36, 48 and 72 hour post-dose on Day 14

Blood samples for plasma PK analysis of GSK3036656 was collected into K3 EDTA tubes at Pre-dose and at pre-dose and at 0.25, 0.5, 0.75, 1, 1.5, 2, 3, 4, 6, 8, 12, 15, 24, 36, 48 and 72 hour post-dose on Day 14The actual date and time of each blood sample collection was recorded. Results presented are for Day 14.

Cmax of GSK3036656 Following Repeated Dose Administration for Part B
Pre-dose and at 0.25, 0.5, 0.75, 1, 1.5, 2, 3, 4, 6, 8, 12, 15, 24, 36, 48 and 72 hour post-dose on Day 1; at pre-dose and at 0.25, 0.5, 0.75, 1, 1.5, 2, 3, 4, 6, 8, 12, 15, 24, 36, 48 and 72 hour post-dose on Day 14; and at pre-dose on Days 12 and 13

Blood samples for plasma PK analysis of GSK3036656 was collected into K3 EDTA tubes at Pre-dose and at 0.25, 0.5, 0.75, 1, 1.5, 2, 3, 4, 6, 8, 12, 15, 24, 36, 48 and 72 hour post-dose on Day 1; at pre-dose and at 0.25, 0.5, 0.75, 1, 1.5, 2, 3, 4, 6, 8, 12, 15, 24, 36, 48 and 72 hour post-dose on Day 14; and at pre-dose on Days 12 and 13. The actual date and time of each blood sample collection was recorded.

Tmax of GSK3036656 Following Repeat Dose Administration for Part B
Pre-dose and at 0.25, 0.5, 0.75, 1, 1.5, 2, 3, 4, 6, 8, 12, 15, 24, 36, 48 and 72 hour post-dose on Day 1; at pre-dose and at 0.25, 0.5, 0.75, 1, 1.5, 2, 3, 4, 6, 8, 12, 15, 24, 36, 48 and 72 hour post-dose on Day 14; and at pre-dose on Days 12 and 13

Blood samples for plasma PK analysis of GSK3036656 was collected into K3 EDTA tubes at Pre-dose and at 0.25, 0.5, 0.75, 1, 1.5, 2, 3, 4, 6, 8, 12, 15, 24, 36, 48 and 72 hour post-dose on Day 1; at pre-dose and at 0.25, 0.5, 0.75, 1, 1.5, 2, 3, 4, 6, 8, 12, 15, 24, 36, 48 and 72 hour post-dose on Day 14; and at pre-dose on Days 12 and 13. The actual date and time of each blood sample collection was recorded.

t1/2 of GSK3036656 Following Repeated Dose Administration for Part B
Pre-dose and at 0.25, 0.5, 0.75, 1, 1.5, 2, 3, 4, 6, 8, 12, 15, 24, 36, 48 and 72 hour post-dose on Day 14.

Blood samples for plasma PK analysis of GSK3036656 was collected into K3 EDTA tubes pre-dose and at 0.25, 0.5, 0.75, 1, 1.5, 2, 3, 4, 6, 8, 12, 15, 24, 36, 48 and 72 hour post-dose on Day 14. The actual date and time of each blood sample collection was recorded. Results presented are for Day 14.

Secondary Endpoints

Change From Baseline in Time to Sputum Culture Positivity
At Baseline and at days 1, 2, 3, 4, 6, 8, 10, 12 and 14
Number of Participants With Serious Adverse Events (SAEs)
From Day 1 to Day 28
Number of Participants With Adverse Events (AE) of Grade 3 Severity or Higher
From Day 1 to Day 28
Unlock Study Endpoints

Study Design & Arms

AllocationRANDOMIZED
MaskingSINGLE
ModelPARALLEL
PurposeOTHER

Treatment Arms

ArmTypeDescription
GSK3036656 + BedaquilineEXPERIMENTALParticipants received GSK3036656 20 milligram (mg) + bedaquiline 400 mg once daily for 14 days; loading doses: 50 mg GSK3036656 (Day 1), 700 mg bedaquiline (Day 1), 500 mg (Day 2), then 400 mg daily (Days 3-14).
GSK3036656 + DelamanidEXPERIMENTALParticipants received GSK3036656 20 mg + delamanid 300 mg once daily for 14 days; 50 mg GSK3036656 loading dose on Day 1.
Delamanid + BedaquilineEXPERIMENTALParticipants received delamanid 300 mg + bedaquiline 400 mg once daily for 14 days; bedaquiline loading doses: 700 mg (Day 1), 500 mg (Day 2), then 400 mg daily (Days 3-14).
Standard of care for drug-sensitive tuberculosis (DS - TB)_Cohort 1EXPERIMENTALParticipants received Rifafour e-275 (or equivalent generic) once daily for 14 days.
GSK3036656 + BTZ-043EXPERIMENTALParticipants received GSK3036656 20 mg + BTZ-043 1000 mg once daily for 14 days; 50 mg GSK3036656 loading dose on Day 1.
Standard of care for DS - TB_Cohort 2EXPERIMENTALParticipants received Rifafour e-275 (or equivalent generic) once daily for 14 days.
GSK3036656 + PretomanidEXPERIMENTALParticipants received GSK3036656 20 mg + pretomanid 200 mg once daily for 14 days; 50 mg GSK3036656 loading dose on Day 1.
GSK3036656 + LinezolidEXPERIMENTALParticipants received GSK3036656 20 mg + linezolid 600 mg once daily for 14 days; 50 mg GSK3036656 loading dose on Day 1.
GSK3036656 + moxifloxacinEXPERIMENTALParticipants received GSK3036656 20 mg + moxifloxacin 400 mg once daily for 14 days; 50 mg GSK3036656 loading dose on Day 1.
Standard of care for DS TB_Cohort 3EXPERIMENTALParticipants received Rifafour e-275 (or equivalent generic) once daily for 14 days.
Rifafour e-275ACTIVE_COMPARATORAll participants will receive a standard-of-care therapy (rifafour e-275) tablet, orally, once daily from Day 1 to Day 14. Participants will receive the standard treatment for tuberculosis (i.e. rifafour e-275 or equivalent generic alternative) once the study treatment (Day 1 to Day 14) is completed.
GSK3036656 1 mgEXPERIMENTALParticipants will receive a loading dose of GSK3036656 3 milligram (mg), capsule, orally on Day 1, followed by maintenance dose of GSK3036656 1 mg, orally, once daily from Day 2 to Day 14.
GSK3036656 5 mgEXPERIMENTALParticipants will receive a loading dose of GSK3036656 15 mg, capsule, orally on Day 1, followed by maintenance dose of GSK3036656 5 mg, orally, once daily from Day 2 to Day 14.
GSK3036656 15 mgEXPERIMENTALParticipants will receive a loading dose of GSK3036656 30 mg, capsule, orally on Day 1, followed by maintenance dose of GSK3036656 15 mg, orally, once daily from Day 2 to Day 14.
GSK3036656 30 mgEXPERIMENTALParticipants will receive a loading dose of GSK3036656 75 mg, capsule, orally on Day 1, followed by maintenance dose of GSK3036656 30 mg, orally, once daily from Day 2 to Day 14.
Cohort 1- GSK3036656 in Part AEXPERIMENTALDuring Part A (Cohort 1), Subjects will receive a single dose of GSK3036656 in the morning on Day 1 in each of the 4 treatment (dosing) periods after an overnight fast of at least 8 hours. Dosing with food may also be done in Part A once results from the food effect analysis are available. The total daily dose for the treatment (dosing) period may also be divided into 2 or 3 smaller doses administered within 24 hours on discretion of the GSK study team and the principal investigator. The starting dose in Part A will be 5 mg and will then be escalated up to a dose no higher than 1500 mg. One of the 4 dosing periods will be food effect group which will be determined based on from previous cohorts. For the food effect assessment, the selected dose will be given with a high fat meal. There will be a 2 week washout between doses initially but the washout period may be modified depending on emerging data from previous cohorts. Subjects will be followed up to 2 weeks from the last dose.
Cohort 1- Placebo in Part APLACEBO_COMPARATORDuring Part A (Cohort 1), Subjects will receive a single matching placebo in morning on Day 1 in each of the 4 treatment (dosing) periods after an overnight fast of at least 8 hours. Dosing with food may also be done in Part A once results from the food effect analysis are available. Placebo for the treatment (dosing) period may also be divided into 2 or 3 smaller doses administered within 24 hours in a similar manner if divided for subjects receiving active treatment in the same period. One of the 4 dosing periods will be food effect group which will be determined based on from previous cohorts. For the food effect assessment, placebo will be given with a high fat meal. There will be a 2 week washout between doses initially but the washout period may be modified depending on emerging data from previous cohorts. Subjects will be followed up to 2 weeks from the last dose.
Cohort 2- GSK3036656 in Part AEXPERIMENTALDuring Part A (Cohort 2), Subjects will receive a single dose of GSK3036656 in morning on Day 1 in each period after an overnight fast of at least 8 hours. Dosing with food may also be done once results from the food effect analysis are available. The total dose for the treatment period may also be divided into 2 or 3 smaller doses administered within 24 hours on discretion of the GSK study team and the principal investigator. The dose will be selected on basis of safety, tolerability and PK data from the previous treatment period or cohort and will then be escalated up to a dose no higher than 1500 mg. One of the 4 dosing periods will be food effect group, determined based on from previous cohorts, where the selected dose will be given with a high fat meal. There will be a 2 week washout between doses initially but the washout period may be modified depending on emerging data from previous cohorts. Subjects will be followed up to 2 weeks from the last dose.
Cohort 2- Placebo in Part APLACEBO_COMPARATORDuring Part A (Cohort 2), Subjects will receive a single matching placebo in morning on Day 1 in each of the 4 treatment (dosing) periods after an overnight fast of at least 8 hours. Dosing with food may also be done once results from the food effect analysis are available. Placebo for the treatment period may also be divided into 2 or 3 smaller doses administered within 24 hours in a similar manner if divided for subjects receiving active treatment in the same period. One of the 4 dosing periods will be food effect group, determined based on from previous cohorts, where the placebo will be given with a high fat meal. There will be a 2 week washout between doses initially but the washout period may be modified depending on emerging data from previous cohorts. Subjects will be followed up to 2 weeks from the last dose.
Cohort 3- GSK3036656 in Part BEXPERIMENTALDuring Part B (Cohort 3), Subjects will receive a single dose of GSK3036656 once daily in morning on Day 1 after an overnight fast of at least 8 hours. Subjects will receive repeat single dose of GSK3036656 once daily over a period of 14 days. Dosing with food may also be done if there are PK or tolerability reasons making it preferable to dose in a fed state (dose will be given with a high fat meal.). The total dose may also be divided into 2 or 3 smaller doses administered within 24 hours on discretion of the GSK study team and the principal investigator. Appropriate dose and dose regimen will be selected on available safety, tolerability and PK data from Part A. Subjects will be followed up to 2 weeks from the last dose.
Cohort 3- Placebo in Part BPLACEBO_COMPARATORDuring Part B (Cohort 3), Subjects will receive a single matching placebo once daily in morning on Day 1 after an overnight fast of at least 8 hours. Subjects will receive a placebo once daily over a period of 14 days. Dosing with food may also be done if the active treatment is given in a fed state (dose will be given with a high fat meal.). The total dose may also be divided into 2 or 3 smaller doses administered within 24 hours in a similar manner if divided for subjects receiving active treatment in the same cohort. Subjects will be followed up to 2 weeks from the last dose.
Cohort 4- GSK3036656 in Part BEXPERIMENTALDuring Part B (Cohort 4), Subjects will receive a single dose of GSK3036656 once daily in morning on Day 1 after an overnight fast of at least 8 hours. Subjects will receive repeat single dose of GSK3036656 once daily over a period of 14 days. Dosing with food may also be done if there are PK or tolerability reasons making it preferable to dose in a fed state (dose will be given with a high fat meal.). The total dose may also be divided into 2 or 3 smaller doses administered within 24 hours on discretion of the GSK study team and the principal investigator. Appropriate dose and dose regimen will be selected on available safety, tolerability and PK data from preceding repeat dose cohorts from Part B. Subjects will be followed up to 2 weeks from the last dose.
Cohort 4- Placebo in Part BPLACEBO_COMPARATORDuring Part B (Cohort 4), Subjects will receive a single matching placebo once daily in morning on Day 1 after an overnight fast of at least 8 hours. Subjects will receive a placebo once daily over a period of 14 days. Dosing with food may also be done if the active treatment is given in a fed state (dose will be given with a high fat meal.). The total dose may also be divided into 2 or 3 smaller doses administered within 24 hours in a similar manner if divided for subjects receiving active treatment in the same cohort. Subjects will be followed up to 2 weeks from the last dose.
Cohort 5- GSK3036656 in Part BEXPERIMENTALDuring Part B (Cohort 5), Subjects will receive a single dose of GSK3036656 once daily in morning on Day 1 after an overnight fast of at least 8 hours. Subjects will receive repeat single dose of GSK3036656 once daily over a period of 14 days. Dosing with food may also be done if there are PK or tolerability reasons making it preferable to dose in a fed state (dose will be given with a high fat meal.). The total dose may also be divided into 2 or 3 smaller doses administered within 24 hours on discretion of the GSK study team and the principal investigator. Appropriate dose and dose regimen will be selected on available safety, tolerability and PK data from preceding repeat dose cohorts from Part B. Subjects will be followed up to 2 weeks from the last dose.
Cohort 5- Placebo in Part BPLACEBO_COMPARATORDuring Part B (Cohort 5), Subjects will receive a single matching placebo once daily in morning on Day 1 after an overnight fast of at least 8 hours. Subjects will receive a placebo once daily over a period of 14 days. Dosing with food may also be done if the active treatment is given in a fed state (dose will be given with a high fat meal.). The total dose may also be divided into 2 or 3 smaller doses administered within 24 hours in a similar manner if divided for subjects receiving active treatment in the same cohort. Subjects will be followed up to 2 weeks from the last dose.
Cohort 6- GSK3036656 in Part BEXPERIMENTALDuring Part B (Cohort 6), Subjects will receive a single dose of GSK3036656 once daily in morning on Day 1 after an overnight fast of at least 8 hours. Subjects will receive repeat single dose of GSK3036656 once daily over a period of 14 days. Dosing with food may also be done if there are PK or tolerability reasons making it preferable to dose in a fed state (dose will be given with a high fat meal.). The total dose may also be divided into 2 or 3 smaller doses administered within 24 hours on discretion of the GSK study team and the principal investigator. Appropriate dose and dose regimen will be selected on available safety, tolerability and PK data from preceding repeat dose cohorts from Part B. Subjects will be followed up to 2 weeks from the last dose.
Cohort 6- Placebo in Part BPLACEBO_COMPARATORDuring Part B (Cohort 6), Subjects will receive a single matching placebo once daily in morning on Day 1 after an overnight fast of at least 8 hours. Subjects will receive a placebo once daily over a period of 14 days. Dosing with food may also be done if the active treatment is given in a fed state (dose will be given with a high fat meal.). The total dose may also be divided into 2 or 3 smaller doses administered within 24 hours in a similar manner if divided for subjects receiving active treatment in the same cohort. Subjects will be followed up to 2 weeks from the last dose.

Interventions

NameTypeDescription
GSK3036656DRUGGSK3036656 was administered.
BedaquilineDRUGBedaquiline was administered.
DelamanidDRUGDelamanid was administered.
RIFAFOUR e-275DRUGRIFAFOUR e-275 was administered.
BTZ-043DRUGBTZ-043 was administered.
PretomanidDRUGPretomanid was administered.
LinezolidDRUGLinezolid was administered.
MoxifloxacinDRUGMoxifloxacin was administered.
PlaceboDRUGPlacebo is a matching capsule containing Avicel PH (Suitable for Pharmaceutical Use) 102, for oral administration.
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Eligibility Criteria

Age Range18 Years to 65 Years
SexALL
Healthy VolunteersNo
Study Sites1

Inclusion Criteria: * Participants were 18 to 65 years of age inclusive, at the time of signing the informed consent. * Participants had: 1. A new episode of untreated, rifampicin-susceptible pulmonary tuberculosis (TB) 2. A chest X-ray picture consistent with pulmonary TB 3. At least one sp...

Countries:South AfricaUnited Kingdom
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Competitive Landscape -Tuberculosis 7 trials

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Recent Changes (Last 90 Days)

MEDIUMJul 18, 2026NCT05382312TRIAL_REMOVED: changed
MEDIUMJul 18, 2026NCT05382312TRIAL_REMOVED: changed
MEDIUMJul 18, 2026NCT05382312TRIAL_REMOVED: changed

Frequently asked questions about GSK3036656

What is GSK3036656 used for?

GSK3036656 is an investigational small molecule being developed for the treatment of tuberculosis. It is currently in Phase 2 clinical development and has been studied in patients with drug-sensitive pulmonary tuberculosis and rifampicin susceptible pulmonary tuberculosis.

How does GSK3036656 work?

GSK3036656 is a small molecule antibacterial agent. Its specific molecular target has not been disclosed in the available information, so its precise mechanism of action is not described here.

Who makes GSK3036656?

GSK3036656 is being developed by GSK plc, a global biopharmaceutical company. GSK plc is publicly traded on the London Stock Exchange under the ticker GSK.

What phase is GSK3036656 in?

GSK3036656 is in Phase 2 clinical development. It has completed three clinical trials, including a Phase 1 first-in-human study and two Phase 2 early bactericidal activity studies. It is not yet approved and remains investigational.

What clinical trials is GSK3036656 in?

GSK3036656 has completed three trials: NCT03075410, a Phase 1 first-in-human safety and pharmacokinetics study in healthy subjects in the United Kingdom; NCT03557281, a Phase 2 early bactericidal activity study in patients with drug-sensitive pulmonary tuberculosis in South Africa; and NCT05382312, a Phase 2 study of GSK3036656 in combination with other antitubercular agents in adults with rifampicin susceptible pulmonary tuberculosis.

Is GSK3036656 FDA approved?

GSK3036656 is not FDA approved. It is an investigational drug currently in Phase 2 clinical development. All three of its clinical trials have been completed, but it has not received regulatory approval for the treatment of tuberculosis.