A Phase 2/3 interventional study of Rifapentine daily for 6 weeks and Rifapentine and Isoniazid weekly for 12 weeks in Latent Tuberculosis, sponsored by Centers for Disease Control and Prevention. Recruiting at 21 sites in 8 countries. Per ClinicalTrials.gov, last updated 2026-05-06.
Sponsored by Centers for Disease Control and Prevention · Phase 2/3, Interventional, and Treatment
This study is conducted to compare the safety and effectiveness of a novel short 6-week regimen of daily rifapentine (6wP, experimental arm) with a comparator arm of 12-16 weeks of rifamycin-based treatment (standard of care, control arm) of latent M. tuberculosis infection (LTBI).
This trial is conducted among persons who are at increased risk of progression to tuberculosis (TB) and require treatment of LTBI. The study will be conducted in low, medium and high TB incidence settings that have treatment of LTBI as their standard of care and offer 12-16 week rifamycin-based therapy as standard of care.
The hypothesis of this study is that the safety and effectiveness of the experimental treatment (6wP arm) is non-inferior to a comparator arm of 12-16 weeks of rifamycin-based treatment of LTBI (control arm).
Participants are enrolled and randomly assigned to one of the two study arms: experimental 6wP or control. The comparator (control) arm's treatment regimens include 12 weeks of once-weekly isoniazid (INH) and rifapentine (3HP), 12 weeks of daily INH and rifampin (3HR), and 16 weeks of daily rifampin (4R). A total of 560 participants per arm (1,120 total) for the evaluation of safety and 1,700 participants per arm (3,400 total) for the evaluation of effectiveness will be enrolled, given treatment as per randomization assignment, and followed for 24 months from the date of enrollment.
After completion of data collection, statistical analyses will be conducted to compare proportions of drug discontinuation due to adverse drug reaction (ADR) and proportions of newly diagnosed tuberculosis between 6wP and control arm.
199 studies on the registry are indexed under Latent Tuberculosis; 48 are open to participants now.
This study's planned enrollment of 3,400 is above the median of 300 across 110 interventional studies indexed under Latent Tuberculosis.
Browse Latent Tuberculosis studies →Centers for Disease Control and Prevention is the lead sponsor of 275 studies on the registry; 2 are open to participants now.
Of its 11 completed or terminated interventional studies of FDA-regulated products, 8 (73%) have results posted.
Counted across the registry records on this site, refreshed daily.
Go through the criteria one by one — yes, no or not sure — and take the list to your doctor or the study team. Kept in this browser only.
Persons with LTBI who do not have evidence of TB disease (see exclusion criteria) and are at increased risk of progression to TB. LTBI or M. tuberculosis infection may be demonstrated by either a positive tuberculin skin test (TST) or a positive interferon gamma release assay (IGRA; e.g., QuantiFERON or T.SPOT.TB). Details of testing definitions and requirements for each risk factor are further described in the MOOP. Persons with LTBI at increased risk of progression to TB are those with at least one of the following:
Household and other close contacts (> 4 hours of exposure in a one-week period) within 2 years prior to enrollment, of persons with bacteriologically confirmed TB.
o Acceptable testing approaches for bacteriologic confirmation are 1) culture with rifamycin DST; or, 2) nucleic acid amplification tests (NAATs) that detect M. tuberculosis and detect mutations associated with rifamycin resistance. Additional details on bacteriologic confirmation, including accepted NAATs, will be included in the MOOP.
For the following special populations, both inclusion criteria above must be met AND the criteria below depending on stage:
Pregnant women in their second or third trimester (≥14 weeks gestation).
Children aged less than 12 years
Exclusion Criteria
Underlined terms in the criteria open these too. Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
The human immunodeficiency virus, which weakens the immune system.
Many studies now accept people whose HIV is controlled on treatment, judged by the viral load and the CD4 count. Check the limits this study sets.
The number of CD4 cells, a type of white blood cell, in a given amount of blood. It is used to follow how well the immune system is doing in HIV.
A weakened immune system. It can come from an illness, such as HIV or some blood cancers, or from medicines that turn the immune system down, for example after an organ transplant or for an autoimmune disease; steroids at higher doses count.
Read whether the line is about a condition or about medicines, and which medicines and doses it means.
Anti-inflammatory medicines such as prednisone, prednisolone and dexamethasone — not the anabolic steroids used for muscle.
Studies differ in what they allow: check which steroid medicines, routes (tablets, injections, creams, inhalers, eye drops) and doses this study accepts.
Before you join, the study team explains what taking part involves — its purpose, what happens, the risks and possible benefits — and answers your questions, so you can decide freely. Consent is usually recorded on a form (the informed consent form, ICF) signed by you or, where the law allows, by someone legally authorised to decide for you.
You can keep asking questions during the study, you are told of new information that matters, and you can choose to leave at any time.
Able to become pregnant: from the first period until menopause, unless permanently unable to through surgery (removal of the womb, or of both ovaries or both fallopian tubes).
Criteria for people of childbearing potential usually ask for a negative pregnancy test and for contraception during the study and for a time after it.
Ways of preventing pregnancy. “Highly effective” methods fail less than 1% of the time a year when used correctly — for example an IUD or an implant.
Criteria usually say which methods count and how long to keep using them after the last dose, sometimes for male participants too. Some studies accept a partner’s vasectomy if it was confirmed successful and that person is the participant’s only sexual partner.
Two enzymes measured in a routine blood test of the liver. Higher levels can mean the liver is under strain or damaged. SGPT and SGOT are older names for ALT and AST.
Criteria usually give a limit as a multiple of the upper limit of normal (ULN), often higher when cancer has spread to the liver.
The top of the normal range for a blood test, as set by the laboratory that runs it. Each lab prints its own range next to your result.
“≤ 2.5 × ULN” means the result can be up to two and a half times that top value.
A reason a treatment, test or procedure should not be given to a particular person, such as an allergy, another illness or a medicine they take.
HIV
The human immunodeficiency virus, which weakens the immune system.
Many studies now accept people whose HIV is controlled on treatment, judged by the viral load and the CD4 count. Check the limits this study sets.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
CD4 count
The number of CD4 cells, a type of white blood cell, in a given amount of blood. It is used to follow how well the immune system is doing in HIV.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Immunosuppression
A weakened immune system. It can come from an illness, such as HIV or some blood cancers, or from medicines that turn the immune system down, for example after an organ transplant or for an autoimmune disease; steroids at higher doses count.
Read whether the line is about a condition or about medicines, and which medicines and doses it means.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Corticosteroids (steroids)
Anti-inflammatory medicines such as prednisone, prednisolone and dexamethasone — not the anabolic steroids used for muscle.
Studies differ in what they allow: check which steroid medicines, routes (tablets, injections, creams, inhalers, eye drops) and doses this study accepts.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Informed consent
Before you join, the study team explains what taking part involves — its purpose, what happens, the risks and possible benefits — and answers your questions, so you can decide freely. Consent is usually recorded on a form (the informed consent form, ICF) signed by you or, where the law allows, by someone legally authorised to decide for you.
You can keep asking questions during the study, you are told of new information that matters, and you can choose to leave at any time.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Childbearing potential
Able to become pregnant: from the first period until menopause, unless permanently unable to through surgery (removal of the womb, or of both ovaries or both fallopian tubes).
Criteria for people of childbearing potential usually ask for a negative pregnancy test and for contraception during the study and for a time after it.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Contraception
Ways of preventing pregnancy. “Highly effective” methods fail less than 1% of the time a year when used correctly — for example an IUD or an implant.
Criteria usually say which methods count and how long to keep using them after the last dose, sometimes for male participants too. Some studies accept a partner’s vasectomy if it was confirmed successful and that person is the participant’s only sexual partner.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
ALT and AST (liver enzymes)
Two enzymes measured in a routine blood test of the liver. Higher levels can mean the liver is under strain or damaged. SGPT and SGOT are older names for ALT and AST.
Criteria usually give a limit as a multiple of the upper limit of normal (ULN), often higher when cancer has spread to the liver.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
ULN (upper limit of normal)
The top of the normal range for a blood test, as set by the laboratory that runs it. Each lab prints its own range next to your result.
“≤ 2.5 × ULN” means the result can be up to two and a half times that top value.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Contraindication
A reason a treatment, test or procedure should not be given to a particular person, such as an allergy, another illness or a medicine they take.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Rifapentine daily for 6 weeks: 600 mg of Rifapentine (RPT) given once daily for 6 weeks
Drug: Rifapentine daily for 6 weeks
A 12-16 week rifamycin-based regimen available at the participant's site: "Rifapentine and Isoniazid weekly for 12 weeks" (3HP) or "Rifampin and Isoniazid daily for 12 weeks" (3HR) or "Rifampin daily for 16 weeks" (4R)
Drug: Rifapentine and Isoniazid weekly for 12 weeks · Drug: Rifampin and Isoniazid daily for 12 weeks · Drug: Rifampin daily for 16 weeks
600 mg of Rifapentine (RPT) given once daily (o.d., omni die) for 6 weeks (6wP).
Also known as: priftin
Rifapentine (RPT) 900 mg and isoniazid (INH) 900 mg given once-weekly for 12 weeks (3HP).\* \*Dose adjustments based on patient's weight will be made according to ATS/CDC/IDSA guidelines. RPT 900 mg once-weekly for persons weighing \> 50 kg. For persons weighing \< 50 kg, the following doses will be given: weight \> 25-32 kg - RPT 600 mg; weight \> 32-50 kg - RPT 750 mg; + INH 15 mg/kg (round up to nearest 50 or 100 mg; 900 mg max).
Rifampin (RIF) 600 mg and Isoniazid (INH) 300 mg given once-daily for 12 weeks (3HR)\*. \*Dose adjustments based on patient's weight will be made according to ATS/CDC/IDSA guidelines. RIF 600 mg daily for persons weighing \> 50 kg. For persons weighing \< 50 kg, give 10 mg/kg daily; round up to nearest 50 or 100 mg; + INH 5 mg/kg daily (rounded up to nearest 50 or 100 mg; 300 mg max).
Rifampin (RIF) 600 mg given once-daily for 16 weeks (4R).\* \*Dose adjustments based on patient's weight will be made according to ATS/CDC/IDSA guidelines. RIF 600 mg daily for persons weighing \> 50 kg. For persons weighing \< 50 kg, 10 mg/kg daily; round up to nearest 50 or 100 mg.
Treatment discontinuation due to adverse drug reaction
1\. Safety: Drug discontinuation due to adverse drug reaction (ADR) associated with 6wP and the rifamycin-based comparator arm (3HP, 3HR, or 4R). • Attribution of an adverse event (AE) to study drugs will be initially determined by the local site investigator, reviewed by an independent, blinded adjudication panel and with final attribution determined by the sponsor.
Time frame: from the date of enrollment to the date of scheduled completion of assigned treatment
Culture-confirmed tuberculosis (TB) in participants 18 years old and older and culture-confirmed or clinical TB in participants less then 18 years old.
2\. Effectiveness: Culture-confirmed TB in participants \> 18 years old and culture-confirmed or clinical TB in participants \< 18 years old. * Diagnosis of culture-confirmed TB will be performed using liquid and/or solid media. * An independent, blinded adjudication panel will review all TB events.
Time frame: within 24 months from the date of enrollment
Proportion who complete assigned treatment
Proportion of participants who complete assigned study treatment during the study period. Treatment completion is defined as taking at least 90% of the prescribed doses within the protocol-defined time period.
Time frame: from date of enrollment until the maximum accepted time for treatment completion as follows: 9 weeks for 6wP treatment, 16 weeks for 3HP, 16 weeks for 3HP, and 21 weeks for 4R
Proportion of Participants Who Complete Assigned Study Treatment
Proportion of participants who complete assigned study treatment during the study period. Treatment completion is defined as taking at least 90% of the prescribed doses within the protocol-defined time period.
Time frame: from date of enrollment until the maximum accepted time for treatment completion as follows: 9 weeks for 6wP treatment, 16 weeks for 3HP, 16 weeks for 3HP, and 21 weeks for 4R
Proportion with any grade 3, 4, or 5 (i.e., death) adverse event associated with study drug
Proportion of participants who experience at least one Grade 3, 4, or 5 adverse event related to study drug during the study period. Adverse events will be graded using the Common Terminology Criteria for Adverse Events (CTCAE), Version 5.0 (Grade 3 = severe, Grade 4 = life-threatening, Grade 5 = death). Relationship to study drug will be determined by the site investigator and reviewed by an independent blinded adjudication panel.
Time frame: within 6 months from the date of enrollment
Proportion of Participants Who Die From Any Cause
Proportion of participants who die from any cause during the study period. Deaths will be ascertained through participant follow-up, medical records, or death registries and reviewed by an independent blinded adjudication panel.
Time frame: within 24 months from the date of enrollment
Proportion of Participants With Hepatotoxicity or Non-Hepatotoxic Systemic Drug Reactions
Proportion of participants who experience at least one event of hepatotoxicity or non-hepatotoxic systemic drug reaction during the study period. Hepatotoxicity and systemic drug reactions will be defined per protocol and graded using Common Terminology Criteria for Adverse Events (CTCAE), Version 5.0. Relationship to study drug will be determined by the investigator.
Time frame: within 6 months from the date of enrollment
Proportion of Participants with Culture-Confirmed or Clinical Tuberculosis (TB)
Proportion of participants who develop culture-confirmed or clinical tuberculosis (TB) during the study period, regardless of age. Culture-confirmed TB will be based on microbiological confirmation using liquid and/or solid culture methods. Clinical TB will be defined according to protocol-specified diagnostic criteria and adjudicated by an independent blinded panel.
Time frame: within 24 months from the date of enrollment
Proportion of Participants Who Develop Tuberculosis (TB) Among Those Who Complete Assigned Study Treatment
Proportion of participants who develop tuberculosis (TB) among those who complete assigned study treatment during the study period. Completion of treatment is defined per protocol. TB will be defined as culture-confirmed or clinical TB based on microbiological or protocol-specified clinical criteria and reviewed by an independent blinded adjudication panel.
Time frame: within 24 months from the date of enrollment
Proportion of Participants With HIV Infection Who Discontinue Study Treatment Due to Adverse Drug Reactions
Proportion of HIV-infected patients with drug discontinuation due to adverse drug reaction (ADR) associated with experimental treatment (6wP) or active comparator treatment (the rifamycin-based 3HP, 3HR, or 4R) . Attribution of an adverse event (AE) to study drugs will be determined by the local site investigator.
Time frame: from date of enrollment until the maximum accepted time for treatment completion as follows: 9 weeks for 6wP treatment, 16 weeks for 3HP, 16 weeks for 3HP, and 21 weeks for 4R
Safety (defined as treatment discontinuation due to adverse drug reaction) among participants < 18 years old.
Proportion of participants \< 18 years old with drug discontinuation due to adverse drug reaction (ADR) associated with experimental treatment (6wP) or active comparator treatment (the rifamycin-based 3HP, 3HR, or 4R) . Attribution of an adverse event (AE) to study drugs will be determined by the local site investigator.
Time frame: from date of enrollment until the maximum accepted time for treatment completion as follows: 9 weeks for 6wP treatment, 16 weeks for 3HP, 16 weeks for 3HP, and 21 weeks for 4R
Tolerability (defined as proportion of with drug discontinuation for any reason) among participants with human immunodeficiency virus (HIV) infection.
Proportion of HIV-infected patients with drug discontinuation for any reason
Time frame: from date of enrollment until the maximum accepted time for treatment completion as follows: 9 weeks for 6wP treatment, 16 weeks for 3HP, 16 weeks for 3HP, and 21 weeks for 4R
Tolerability (defined as proportion of with drug discontinuation for any reason) among participants < 18 years old.
Proportion of participants \< 18 years old with drug discontinuation for any reason
Time frame: from date of enrollment until the maximum accepted time for treatment completion as follows: 9 weeks for 6wP treatment, 16 weeks for 3HP, 16 weeks for 3HP, and 21 weeks for 4R
Effectiveness among participants with human immunodeficiency virus (HIV) infection.
Proportion of HIV-infected patients with culture-confirmed tuberculosis (TB) in participants 18 years old and older and culture-confirmed or clinical TB in participants less then 18 years old. Diagnosis of culture-confirmed TB will be performed using liquid and/or solid media methods.
Time frame: within 24 months from the date of enrollment
Effectiveness among participants < 18 years old.
Proportion of participants \< 18 years old with culture-confirmed tuberculosis or clinical TB. Diagnosis of culture-confirmed TB will be performed using liquid and/or solid media methods.
Time frame: within 24 months from the date of enrollment
Proportion with any grade 3, 4, or 5 (i.e., death) adverse event during the time period of 6 months after enrollment
Proportion of participants who experience at least one Grade 3, 4, or 5 adverse event within 6 months after enrollment. Adverse events will be graded using the Common Terminology Criteria for Adverse Events (CTCAE), Version 5.0 (Grade 3 = severe, Grade 4 = life-threatening, Grade 5 = death).
Time frame: within 6 months from the date of enrollment
Effectiveness among pregnant participants
Proportion of pregnant participants with culture-confirmed tuberculosis or clinical TB. Diagnosis of culture-confirmed TB will be performed using liquid and/or solid media methods.
Time frame: within 24 months from the date of enrollment
Safety (defined as treatment discontinuation due to adverse drug reaction) among pregnant participants.
Proportion of pregnant participants with drug discontinuation due to adverse drug reaction (ADR) associated with experimental treatment (6wP) or active comparator treatment (the rifamycin-based 3HP, 3HR, or 4R) .
Time frame: from date of enrollment until the maximum accepted time for treatment completion as follows: 9 weeks for 6wP treatment, 16 weeks for 3HP, 16 weeks for 3HP, and 21 weeks for 4R
Tolerability (defined as proportion of with drug discontinuation for any reason) among pregnant participants
Proportion of pregnant participants with drug discontinuation for any reason
Time frame: from date of enrollment until the maximum accepted time for treatment completion as follows: 9 weeks for 6wP treatment, 16 weeks for 3HP, 16 weeks for 3HP, and 21 weeks for 4R
Proportion of Participants Who Discontinue Study Treatment Due to Adverse Drug Reactions by Treatment Arm
Proportion of participants who permanently discontinue study treatment due to adverse drug reactions (ADRs), summarized separately for the experimental arm (6wP) and each comparator regimen (3HP, 3HR, and 4R). Adverse events will be graded using the Common Terminology Criteria for Adverse Events (CTCAE), Version 5.0, and attribution to study drug will be determined by the investigator and reviewed by an independent blinded adjudication panel.
Time frame: from date of enrollment until the maximum accepted time for treatment completion as follows: 9 weeks for 6wP treatment, 16 weeks for 3HP, 16 weeks for 3HP, and 21 weeks for 4R
Proportion of Participants Who Discontinue Study Treatment for Any Reason by Treatment Regimen
Proportion of participants who discontinue study treatment for any reason during the study period, summarized separately for the experimental arm (6wP) and each comparator regimen (3HP, 3HR, and 4R).
Time frame: from date of enrollment until the maximum accepted time for treatment completion as follows: 9 weeks for 6wP treatment, 16 weeks for 3HP, 16 weeks for 3HP, and 21 weeks for 4R
Proportion of Participants Who Develop Tuberculosis (TB) by Treatment Regimen
Proportion of participants with culture-confirmed tuberculosis (TB) in participants 18 years old and older and culture-confirmed or clinical TB in participants less then 18 years old. Diagnosis of culture-confirmed TB will be performed using liquid and/or solid media methods.
Time frame: within 24 months from the date of enrollment
Proportion of Participants With Drug-Resistant Tuberculosis (TB) Among Those Who Develop TB by Comparator Regimen
Proportion of participants who develop tuberculosis (TB) and have resistance to rifamycins or isoniazid, summarized separately for each comparator regimen (3HP, 3HR, and 4R). Drug resistance will be determined by phenotypic drug susceptibility testing of Mycobacterium tuberculosis isolates.
Time frame: within 24 months from the date of enrollment
Treatment Acceptability Score (Likert-Scale TB Treatment Acceptability Questionnaire)
Participant-reported treatment acceptability score assessed using a Likert-scale tuberculosis (TB) treatment acceptability questionnaire evaluating domains including usability, treatment duration, pill burden, perceived risks versus benefits, and opportunity cost. * Scale range: 6 to 30 * Interpretation: Higher scores indicate greater treatment acceptability
Time frame: within 24 months from the date of enrollment
Health-Related Quality of Life Score (PROMIS-29+2 [PROPr] and PROMIS Pediatric Profile)
Health-related quality of life (HrQoL) assessed using the Patient-Reported Outcomes Measurement Information System (PROMIS-29+2 Profile v2.1 \[PROPr\] for adults and PROMIS Pediatric Profile v3). Scores include physical and mental health component scores derived from PROMIS domains. * Scale range: 0 to 100 (standardized T-scores; mean 50, SD 10) * Interpretation: Higher scores indicate better health-related quality of life
Time frame: within 24 months from the date of enrollment
Area Under the Plasma Concentration-Time Curve (AUC₀-₂₄) of Rifapentine in Participants Receiving 6wP
Population pharmacokinetic parameter AUC₀-₂₄ of rifapentine estimated using nonlinear mixed-effects modeling based on plasma concentration data collected in participants receiving 6 weeks of daily rifapentine (6wP). Unit: µg·h/mL
Time frame: within 24 months from the date of enrollment
Correlation Between Rifapentine AUC₀-₂₄ and Treatment Discontinuation Due to Adverse Drug Reactions
Correlation between rifapentine area under the plasma concentration-time curve from 0 to 24 hours (AUC₀-₂₄; µg·h/mL), measured using validated LC-MS/MS assays, and treatment discontinuation due to adverse drug reactions (% of participants) among participants receiving 6 weeks of daily rifapentine (6wP). Adverse drug reactions will be assessed by the investigator and graded using CTCAE v5.0.
Time frame: within 24 months from the date of enrollment
Correlation Between Rifapentine AUC₀-₂₄ and Treatment Completion
Correlation between rifapentine area under the plasma concentration-time curve from 0 to 24 hours (AUC₀-₂₄; µg·h/mL), measured using validated LC-MS/MS assays, and treatment completion (% of participants completing assigned treatment per protocol) among participants receiving 6 weeks of daily rifapentine (6wP).
Time frame: Within 24 months from the date of enrollment
Not enrolling at this site — choose another above.
Not enrolling at this site — choose another above.
Plan to share: Undecided
No publications or documents are linked to this record.
Eligibility is decided by the study team. Share this record with your doctor or contact the team directly.
Contact study teamGet an email when the registry record changes — status, dates, results — or when someone posts here.
Sign in to followQuestions and observations about this study, from anyone following it. Not medical advice, and not a channel to the study team — their contact details are on the registry record.
Sign in to join the discussion. Reading takes no account; posting does. You choose a display name, and a pseudonym is the default.
Nothing here yet. If you are running this trial, taking part in it, or weighing whether to, this is the place to say so.
Studies of the drug tested here: Rifapentine
Centers for Disease Control and Prevention →