Re-evaluating the Duration in Children of TB Treatment (REDUCE TB)

June 15, 2026 updated by: University of Wisconsin, Madison

Multi-arm, Open-label, Duration-randomized, Phase IIc Study of the Efficacy, Safety, Tolerability, and Pharmacokinetics of Optimized Rifampicin in Combination With Isoniazid, Pyrazinamide, and Ethambutol for the Treatment of Children With Drug-susceptible Tuberculosis

Current tuberculosis (TB) treatment is effective (works well), but it takes a long time to cure TB. This study will evaluate if TB treatment with a higher dose of rifampicin, one of the TB medicines, and shorter TB treatment duration is as effective and safe as the standard, TB treatment (with the usual rifampicin dose and usual duration). This study hopes to find a better shorter treatment that works as well as the current treatment (standard of care). This could benefit children worldwide who are getting TB treatment.

Children 3 months to less than 10 years of age who have drug-susceptible TB (can be successfully treated with standard TB medicines) are eligible for this study.

Study Overview

Status

Status

Indicates the current recruitment status or the expanded access status.
Not yet recruiting

Conditions

Conditions

The disease, disorder, syndrome, illness, or injury that is being studied. On ClinicalTrials.gov, conditions may also include other health-related issues, such as lifespan, quality of life, and health risks.

Intervention / Treatment

Intervention / Treatment

A process or action that is the focus of a clinical study. Interventions include drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available. Interventions can also include noninvasive approaches, such as education or modifying diet and exercise.

Detailed Description

This is a multi-arm open-label phase IIc trial with duration randomization, with a lead-in pharmacokinetics (PK) study. Children 3 months to less than 10 years of age with routinely diagnosed clinical or confirmed drug-susceptible TB will be screened and if eligible randomly assigned 1:1:1:1:1 to one of five arms (durations of TB treatment and control arm). Randomization will be stratified by age (3 months to less than 5 years of age vs 5 to less than 10 years of age).

A total of 200 participants will be enrolled in the main trial (Step 2), with 40 per study arm, with an additional 30 participants enrolled in a Lead-in PK study (Step 1).

Step 1 - Lead-in PK study participants will be on treatment for 8 weeks, complete their trial participation in up to 9 weeks, and will not contribute to the main trial endpoints.

Step 2 - Main trial participants will be on study for 48 weeks.

Primary Objective:

In children with drug-susceptible tuberculosis, with and without HIV:

• To characterize the relationship between treatment duration of the experimental regimen and the proportion of participants with unfavorable treatment outcome at 48 weeks after randomization (i.e., the duration-response curve)

Secondary Objectives:

The secondary objectives of the Lead-In PK study are to

  • Characterize the safety and tolerability of two optimized doses of rifampicin with standard doses of isoniazid, pyrazinamide and ethambutol
  • Characterize the pharmacokinetics of two optimized doses of rifampicin
  • Characterize the acceptability of two optimized doses of rifampicin

The secondary objectives of the Main Study are to:

  • Characterize the safety and tolerability of optimized-dose rifampicin with standard doses of isoniazid, pyrazinamide and ethambutol
  • Characterize the pharmacokinetics of optimized-dose rifampicin
  • Characterize lung health post-TB treatment at week 48 among children able to complete lung-health assessments
  • Characterize the acceptability of optimized-dose rifampicin

Study Type

Study Type

Describes the nature of a clinical study. Study types include interventional studies (also called clinical trials), observational studies (including patient registries), and expanded access.
Interventional

Enrollment (Estimated)

Enrollment

The number of participants in a clinical study. The "anticipated" enrollment is the target number of participants that the researchers need for the study.
230

Phase

Phase

The stage of a clinical trial studying a drug or biological product, based on definitions developed by the U.S. Food and Drug Administration (FDA). The phase is based on the study's objective, the number of participants, and other characteristics. There are five phases: Early Phase 1 (formerly listed as Phase 0), Phase 1, Phase 2, Phase 3, and Phase 4. Not Applicable is used to describe trials without FDA-defined phases, including trials of devices or behavioral interventions.
  • Phase 2

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Contact

Study Contact

The name and contact information for the person who can answer enrollment questions for a clinical study. Each location where the study is being conducted may also have a specific contact, who may be better able to answer those questions.

Study Locations

  • Peru
      • Lima, Peru
        • Socios en Salud Sucursal Peru
        • Principal Investigator:
          • Leonid Lecca, MD

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Eligibility Criteria

The key requirements that people who want to participate in a clinical study must meet or the characteristics they must have. Eligibility criteria consist of both inclusion criteria (which are required for a person to participate in the study) and exclusion criteria (which prevent a person from participating). Types of eligibility criteria include whether a study accepts healthy volunteers, has age or age group requirements, or is limited by sex.

Ages Eligible for Study

  • Child

Accepts Healthy Volunteers

No

Description

Inclusion Criteria:

  • 3 months to less than 10 years of age
  • Body weight greater than or equal to 3 kilograms (kg) and less than 45 kg at study entry

  • Confirmed or clinically diagnosed intrathoracic (pulmonary) and/or some forms of extrathoracic (extrapulmonary) drug-susceptible TB:

    • Confirmed intrathoracic (pulmonary) TB, based on chest radiograph and/or symptoms consistent with TB, and/or some forms of extrathoracic TB, with all of the following as determined by the site investigator:

      • Microbiological confirmation of M. tuberculosis from any clinical specimen by either culture or molecular methods
      • At least rifampicin-susceptibility demonstrated by genotypic (molecular) or phenotypic methods
      • Documented clinical decision to treat for drug-susceptible TB

    • Clinically diagnosed intrathoracic (pulmonary) TB, based on chest radiograph and/or symptoms consistent with TB, and/or some forms of extrathoracic TB, with all of the following as determined by the site investigator:

      • Documented clinical decision to treat for drug-susceptible TB
  • HIV positive or negative
  • For participants living with HIV, they must be on a dolutegravir-based antiretroviral therapy regimen at the time of study entry

Exclusion Criteria:

  • Received routine treatment for TB disease for greater than 5 days at the time of enrollment
  • Exposure to a case of intrathoracic TB in the 12 months prior to enrollment with known or suspected resistance to any of the drugs in the treatment regimens OR confirmed resistance on molecular or phenotypic drug-susceptibility testing to any drugs in the treatment regimens
  • Has greater than or equal to grade 3 results of any of the following during screening: creatinine, serum ALT, AST, total bilirubin
  • Has hemoglobin less than 7.5 g/dL during screening
  • Has TB meningitis, osteoarticular TB, or miliary TB as determined by the site investigator
  • Severe renal, pulmonary, cardiac, gastrointestinal, neurologic or any other condition that in the judgement of the investigator would make participation in the study unsafe, complicate interpretation of study outcome data, or otherwise interfere with achieving study objectives
  • Use of any prohibited drug within 3 days of enrollment
  • Severe acute malnutrition defined as weight-for-height/length z-score or BMI-for-age z-score less than -3
  • Hypersensitivity to any of the study drugs (rifampicin, isoniazid, pyrazinamide or ethambutol)
  • For Main Trial (Step 2) participants, previously enrolled in the Lead-in PK Study (Step 1)

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Primary Purpose: Treatment
  • Allocation: Randomized
  • Interventional Model: Parallel Assignment
  • Masking: None (Open Label)

Arms and Interventions

Participant Group / Arm

Participant Group / Arm

A group or subgroup of participants in a clinical trial that receives a specific intervention/treatment, or no intervention, according to the trial's protocol.
Intervention / Treatment

Intervention / Treatment

A process or action that is the focus of a clinical study. Interventions include drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available. Interventions can also include noninvasive approaches, such as education or modifying diet and exercise.
Experimental: Arm 1: 8 week duration
N = 40, 8 weeks of odRHZE
Drug: Rifampicin
odR for main trial determined from Lead-in PK study 75 mg tablet, and 150 or 300 mg capsule, dosed by weight and age
Other Names:
  • two optimized-doses (odR) rifampicin
Drug: Isoniazid
50 mg tablet, dosed by weight and age
Other Names:
  • Isoniazid (H)
Drug: Pyrazinamide
150 mg tablet, dosed by weight and age
Other Names:
  • Pyrazinamide (Z)
Drug: Ethambutol
100 mg tablet, dosed by weight and age
Other Names:
  • Ethambutol (E)
Drug: Rifampicin
standard of care and only the 75 mg tablet will be used
Other Names:
  • standard dose rifampicin (R)
Experimental: Arm 2: 11 week duration
N = 40, 8 weeks of odRHZE followed by 3 weeks of odRH
Drug: Rifampicin
odR for main trial determined from Lead-in PK study 75 mg tablet, and 150 or 300 mg capsule, dosed by weight and age
Other Names:
  • two optimized-doses (odR) rifampicin
Drug: Isoniazid
50 mg tablet, dosed by weight and age
Other Names:
  • Isoniazid (H)
Drug: Pyrazinamide
150 mg tablet, dosed by weight and age
Other Names:
  • Pyrazinamide (Z)
Drug: Ethambutol
100 mg tablet, dosed by weight and age
Other Names:
  • Ethambutol (E)
Drug: Rifampicin
standard of care and only the 75 mg tablet will be used
Other Names:
  • standard dose rifampicin (R)
Experimental: Arm 3: 14 week duration
N = 40, 8 weeks of odRHZE followed by 6 weeks of odRH
Drug: Rifampicin
odR for main trial determined from Lead-in PK study 75 mg tablet, and 150 or 300 mg capsule, dosed by weight and age
Other Names:
  • two optimized-doses (odR) rifampicin
Drug: Isoniazid
50 mg tablet, dosed by weight and age
Other Names:
  • Isoniazid (H)
Drug: Pyrazinamide
150 mg tablet, dosed by weight and age
Other Names:
  • Pyrazinamide (Z)
Drug: Ethambutol
100 mg tablet, dosed by weight and age
Other Names:
  • Ethambutol (E)
Drug: Rifampicin
standard of care and only the 75 mg tablet will be used
Other Names:
  • standard dose rifampicin (R)
Experimental: Arm 4: 17 week duration
N = 40, 8 weeks of odRHZE followed by 9 weeks of odRH
Drug: Rifampicin
odR for main trial determined from Lead-in PK study 75 mg tablet, and 150 or 300 mg capsule, dosed by weight and age
Other Names:
  • two optimized-doses (odR) rifampicin
Drug: Isoniazid
50 mg tablet, dosed by weight and age
Other Names:
  • Isoniazid (H)
Drug: Pyrazinamide
150 mg tablet, dosed by weight and age
Other Names:
  • Pyrazinamide (Z)
Drug: Ethambutol
100 mg tablet, dosed by weight and age
Other Names:
  • Ethambutol (E)
Drug: Rifampicin
standard of care and only the 75 mg tablet will be used
Other Names:
  • standard dose rifampicin (R)
Active Comparator: Arm 5: Control (17 or 24 week duration)
N = 40, 8 week of RHZ(E) followed by 9 weeks (5a - non-severe TB) or 16 weeks (5b - severe TB) of RH
Drug: Rifampicin
odR for main trial determined from Lead-in PK study 75 mg tablet, and 150 or 300 mg capsule, dosed by weight and age
Other Names:
  • two optimized-doses (odR) rifampicin
Drug: Isoniazid
50 mg tablet, dosed by weight and age
Other Names:
  • Isoniazid (H)
Drug: Pyrazinamide
150 mg tablet, dosed by weight and age
Other Names:
  • Pyrazinamide (Z)
Drug: Ethambutol
100 mg tablet, dosed by weight and age
Other Names:
  • Ethambutol (E)
Drug: Rifampicin
standard of care and only the 75 mg tablet will be used
Other Names:
  • standard dose rifampicin (R)
Experimental: Step 1: PK - Dosing Schedule A > B

N = 15

  • Period 1 - odRIF Dosing Schedule A with HZE, PK sampling after 4 weeks followed by
  • Period 2 - odRIF Dosing Schedule B with HZE, PK sampling after 4 weeks

Dosing schedules are by weight and age, with Schedule A a higher dose of RIF (totaling 250 - 1650mg) than Schedule B (totaling 200 - 1350mg)
Drug: Rifampicin
odR for main trial determined from Lead-in PK study 75 mg tablet, and 150 or 300 mg capsule, dosed by weight and age
Other Names:
  • two optimized-doses (odR) rifampicin
Drug: Isoniazid
50 mg tablet, dosed by weight and age
Other Names:
  • Isoniazid (H)
Drug: Pyrazinamide
150 mg tablet, dosed by weight and age
Other Names:
  • Pyrazinamide (Z)
Drug: Ethambutol
100 mg tablet, dosed by weight and age
Other Names:
  • Ethambutol (E)
Drug: Rifampicin
standard of care and only the 75 mg tablet will be used
Other Names:
  • standard dose rifampicin (R)
Experimental: Step 1: PK - Dosing Schedule B > A

N = 15

  • Period 1 - odRIF Dosing Schedule B with HZE, PK sampling after 4 weeks followed by
  • Period 2 - odRIF Dosing Schedule A with HZE, PK sampling after 4 weeks

Dosing schedules are by weight and age, with Schedule A a higher dose of RIF (totaling 250 - 1650mg) than Schedule B (totaling 200 - 1350mg)
Drug: Rifampicin
odR for main trial determined from Lead-in PK study 75 mg tablet, and 150 or 300 mg capsule, dosed by weight and age
Other Names:
  • two optimized-doses (odR) rifampicin
Drug: Isoniazid
50 mg tablet, dosed by weight and age
Other Names:
  • Isoniazid (H)
Drug: Pyrazinamide
150 mg tablet, dosed by weight and age
Other Names:
  • Pyrazinamide (Z)
Drug: Ethambutol
100 mg tablet, dosed by weight and age
Other Names:
  • Ethambutol (E)
Drug: Rifampicin
standard of care and only the 75 mg tablet will be used
Other Names:
  • standard dose rifampicin (R)

What is the study measuring?

Primary Outcome Measures

Primary Outcome Measures

In a clinical study's protocol, the planned outcome measure that is the most important for evaluating the effect of an intervention/treatment. Most clinical studies have one primary outcome measure, but some have more than one.
Outcome Measure
Measure Description
Time Frame
Step 2: Unfavorable TB treatment outcome
Time Frame: 48 weeks

A participant has unfavorable treatment outcomes if they fail to meet either of the following criteria:

  • No treatment extension or re-treatment for TB at any time up through 48 weeks after randomization.
  • TB recurrence-free cure or Probable TB recurrence-free cure
48 weeks

Secondary Outcome Measures

Secondary Outcome Measures

In a clinical study's protocol, a planned outcome measure that is not as important as the primary outcome measure for evaluating the effect of an intervention but is still of interest. Most clinical studies have more than one secondary outcome measure.
Outcome Measure
Measure Description
Time Frame
Step 1: Safety measured by occurrence of Grade 3 to 5 Adverse Events after the first dose of study treatment by period in Lead-in PK study
Time Frame: data collected from individual participants for 2 regimens of 4 weeks each, up to 8 weeks total
Occurrence of at least one new or worsened Grade 3-5 Adverse Event (AE) after the first dose of study treatment by period.
data collected from individual participants for 2 regimens of 4 weeks each, up to 8 weeks total
Step 1: Tolerability Measured by discontinuation of at least one drug in Lead-in PK study
Time Frame: data collected from individual participants for 2 regimens of 4 weeks each, up to 8 weeks total
Permanent discontinuation of at least one drug in the study regimen during each treatment period due to an AE of any grade that is either safety- or tolerability-related, death due to toxicity (probably/possibly/certainly) related to one or more of the study drugs, or participant/parent/guardian request.
data collected from individual participants for 2 regimens of 4 weeks each, up to 8 weeks total
Step 1: Pharmacokinetics of optimized-dose rifampicin: (AUC0-24)
Time Frame: data collected at week 4 (and week 8) visit lead-in PK study; pre-dose (0 hour), 1, 2, 4, 8 and 24 hour post dose
Area under the concentration time curve over 24 hours (AUC0-24)
data collected at week 4 (and week 8) visit lead-in PK study; pre-dose (0 hour), 1, 2, 4, 8 and 24 hour post dose
Step 1: Pharmacokinetics of optimized-dose rifampicin: (Cmax)
Time Frame: data collected at week 4 (and week 8) visit lead-in PK study; pre-dose (0 hour), 1, 2, 4, 8 and 24 hour post dose
Maximum concentration (Cmax)
data collected at week 4 (and week 8) visit lead-in PK study; pre-dose (0 hour), 1, 2, 4, 8 and 24 hour post dose
Step 1: Acceptability of optimized-dose rifampicin summarized by participant count
Time Frame: baseline (at dose 1), week 4, week 8
Participant and/or parent/guardian responses to rifampicin acceptability question of "Overall, how did you/your child feel about taking this medicine?", scored on a likert scale from 1-5 with higher scores being more acceptable. Summarized by number of responses per score.
baseline (at dose 1), week 4, week 8
Step 2: Safety Measured by Occurrence of at least one new or worsened Grade 3-5 adverse event after the first dose of study treatment in Main Trial
Time Frame: up to 28 weeks
Occurrence of at least one new or worsened Grade 3-5 adverse event after the first dose of study treatment and during the 28 weeks following randomization, where 28 weeks is 4 weeks beyond the longest scheduled treatment duration of 24 weeks.
up to 28 weeks
Step 2: Tolerability Measured by discontinuation of at least one drug in Main Trial
Time Frame: up to 24 weeks
Permanent discontinuation of at least one drug in the study regimen prior to the end of the assigned treatment period due to an AE of any grade that is either safety- or tolerability-related, death due to toxicity (probably/possibly/certainly) related to one or more of the study drugs, or participant/parent/guardian request.
up to 24 weeks
Step 2: Lung function post-TB treatment
Time Frame: week 48

The outcome of interest is abnormal lung function classified as having at least one of the following physiological findings based on results of spirometry and oscillometry (FEV1, forced expiratory volume in 1 second; FVC, forced vital capacity):

  • Obstructive lung disease: defined as FEV1, or FEV1/FVC of <-1.64 z-score (z-score<-1.64 = lower limit of normal, LLN) with normal FVC
  • Restrictive lung disease: defined as FVC <-1.64 z-score with normal FEV1
  • Mixed lung disease: defined as FEV1/FVC <LLN;
  • Isolated small airway dysfunction: defined as oscillometry Area of reactance (AX) >1.64 z-score and/or oscillometry peripheral airway resistance (R5-20) >1.64 z-score with normal FEV1 on spirometry
week 48
Step 2: Acceptability of optimized-dose rifampicin summarized by participant count
Time Frame: baseline (at dose 1), week 4, week 8
Participant and/or parent/guardian responses to rifampicin acceptability question of "Overall, how did you/your child feel about taking this medicine?", scored on a likert scale from 1-5 with higher scores being more acceptable. Summarized by number of responses per score.
baseline (at dose 1), week 4, week 8
Step 2: Acceptability of overall TB treatment regimen summarized by participant count
Time Frame: week 4, week 8
Participant and/or parent/guardian responses to overall TB treatment regimen acceptability question of "In the last 4 weeks, how did you/your child feel about taking this TB treatment regimen, considering all of the TB medicines in the regimen together?", scored on a likert scale from 1-5 with higher scores being more acceptable. Summarized by number of responses per score.
week 4, week 8

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Sponsor

The organization or person who initiates the study and who has authority and control over the study.
University of Wisconsin, Madison

Collaborators

Collaborators

An organization other than the sponsor that provides support for a clinical study. This support may include activities related to funding, design, implementation, data analysis, or reporting.
National Institute of Allergy and Infectious Diseases (NIAID)

Investigators

Investigators

A researcher involved in a clinical study. Related terms include site principal investigator, site sub-investigator, study chair, study director, and study principal investigator.
  • Principal Investigator: Anthony Garcia-Prats, MD, MSc, PhD, UW School of Medicine and Public Health

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start (Estimated)

Study Start

The actual date on which the first participant was enrolled in a clinical study. The "anticipated" study start date is the date that the researchers think will be the study start date.
September 1, 2026

Primary Completion (Estimated)

Primary Completion

The date on which the last participant in a clinical study was examined or received an intervention to collect final data for the primary outcome measure. Whether the clinical study ended according to the protocol or was terminated does not affect this date. For clinical studies with more than one primary outcome measure with different completion dates, this term refers to the date on which data collection is completed for all the primary outcome measures. The "anticipated" primary completion date is the date that the researchers think will be the primary completion date for the study.
September 1, 2030

Study Completion (Estimated)

Study Completion

The date on which the last participant in a clinical study was examined or received an intervention/treatment to collect final data for the primary outcome measures, secondary outcome measures, and adverse events (that is, the last participant's last visit). The "anticipated" study completion date is the date that the researchers think will be the study completion date.
September 1, 2030

Study Registration Dates

First Submitted

First Submitted

The date on which the study sponsor or investigator first submitted a study record to ClinicalTrials.gov. There is typically a delay of a few days between the first submitted date and the record's availability on ClinicalTrials.gov (the first posted date).
May 15, 2026

First Submitted That Met QC Criteria

First Submitted That Met QC Criteria

The date on which the study sponsor or investigator first submits a study record that is consistent with National Library of Medicine (NLM) quality control (QC) review criteria. The sponsor or investigator may need to revise and submit a study record one or more times before NLM's QC review criteria are met. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
June 15, 2026

First Posted (Actual)

First Posted

The date on which the study record was first available on ClinicalTrials.gov after National Library of Medicine (NLM) quality control (QC) review has concluded. There is typically a delay of a few days between the date the study sponsor or investigator submitted the study record and the first posted date.
June 18, 2026

Study Record Updates

Last Update Posted (Actual)

Last Update Posted

The most recent date on which changes to a study record were made available on ClinicalTrials.gov. There may be a delay between when the changes were submitted to ClinicalTrials.gov by the study's sponsor or investigator (the last update submitted date) and the last update posted date.
June 18, 2026

Last Update Submitted That Met QC Criteria

Last Update Submitted That Met QC Criteria

The most recent date on which the study sponsor or investigator submitted changes to a study record that are consistent with National Library of Medicine (NLM) quality control (QC) review criteria. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
June 15, 2026

Last Verified

Last Verified

The most recent date on which the study sponsor or investigator confirmed the information about a clinical study on ClinicalTrials.gov as accurate and current. If a study with a recruitment status of recruiting; not yet recruiting; or active, not recruiting has not been confirmed within the past 2 years, the study's recruitment status is shown as unknown.
June 1, 2026

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

Other Study ID Numbers

Identifiers or ID numbers other than the NCT number that are assigned to a clinical study by the study's sponsor, funders, or others. These numbers may include unique identifiers from other trial registries and National Institutes of Health grant numbers.
  • 2026-0205
  • SMPH | Pediatrics - GPAM (Other Identifier: UW Madison)
  • Protocol Version 2/10/26 (Other Identifier: UW Madison)
  • 1U01AI192041-01 (U.S. NIH Grant/Contract)

Plan for Individual participant data (IPD)

Plan to Share Individual Participant Data (IPD)?

YES

IPD Sharing Supporting Information Type

  • STUDY_PROTOCOL
  • SAP
  • ICF

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

No

Studies a U.S. FDA-regulated device product

No

product manufactured in and exported from the U.S.

No

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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