A Clinical Trial of MK-8527 and Rifampin in Adult Participants With Latent Tuberculosis Infection (MK-8527-019)

May 15, 2026 updated by: Merck Sharp & Dohme LLC

An Open-label, Phase 1 Study to Characterize the Effects of Rifampin on the Pharmacokinetics of MK-8527 in Adult Participants With Latent Tuberculosis Infection

Researchers are studying MK-8527, a new medicine for preventing HIV-1 (human immunodeficiency virus type 1) infection and want to learn if MK-8527 can be given together with rifampin. Rifampin is commonly used to treat people with latent tuberculosis infection (LTBI).

The main goal of this study is to learn what happens to MK-8527 in the body over time when given with and without the medication rifampin in participants with LTBI.

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.

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.
14

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 1

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

  • Adult

Accepts Healthy Volunteers

No

Description

Inclusion Criteria:

The main inclusion criteria include but are not limited to the following:

  • Has a diagnosis of untreated latent tuberculosis infection (LTBI)
  • Has no symptoms of active tuberculosis (TB)
  • Has never received treatment for TB or LTBI
  • Other than having LTBI, is in good health

Exclusion Criteria:

The main exclusion criteria include but are not limited to the following:

  • Has a diagnosis of LTBI made in the context of an outbreak/contact-tracing investigation
  • Has a current or anticipated immunocompromised state
  • Has a history of clinically significant endocrine, gastrointestinal, cardiovascular, hematological, hepatic, immunological, renal, respiratory, genitourinary, or major neurological abnormalities or diseases
  • Has a history of cancer (malignancy)
  • Has a history of active TB
  • Has positive test results for hepatitis B surface antigen, hepatitis C antibodies, or human immunodeficiency virus

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: N/A
  • Interventional Model: Single Group 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: MK-8527 + Rifampin
Participants receive single doses of MK-8527 alone and in combination with daily doses of rifampin.
Drug: Rifampin
Administered orally
Drug: MK-8527
Administered orally

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
Area Under the Concentration-Time Curve From Time Zero to Infinity (AUC0-inf) of MK-8527
Time Frame: At designated time points (up to approximately 2 weeks)
Blood samples will be collected to determine the AUC0-inf of MK-8527 in plasma.
At designated time points (up to approximately 2 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
Number of Participants Who Experience an Adverse Event (AE)
Time Frame: Up to approximately 8 weeks
An AE is any untoward medical occurrence in a participant, temporally associated with the use of study treatment, whether or not considered related to the study treatment. The number of participants who experience an AE will be reported.
Up to approximately 8 weeks
Area Under the Concentration-Time Curve From Time Zero to Last Quantifiable Concentration (AUC0-last) of MK-8527
Time Frame: At designated time points (up to approximately 2 weeks)
Blood samples will be collected to determine AUC0-last of MK-8527 in plasma.
At designated time points (up to approximately 2 weeks)
Area Under the Concentration-Time Curve From Time Zero to 336 Hours (AUC0-336) of MK-8527
Time Frame: At designated time points (up to approximately 2 weeks)
Blood samples will be collected to determine AUC0-336 of MK-8527 in plasma.
At designated time points (up to approximately 2 weeks)
Maximum Plasma Concentration (Cmax) of MK-8527
Time Frame: At designated time points (up to approximately 2 weeks)
Blood samples will be collected to determine Cmax of MK-8527 in plasma.
At designated time points (up to approximately 2 weeks)
Time to Maximum Plasma Concentration (Tmax) of MK-8527
Time Frame: At designated time points (up to approximately 2 weeks)
Blood samples will be collected to determine Tmax of MK-8527 in plasma.
At designated time points (up to approximately 2 weeks)
Terminal Elimination Half-Life (T1/2) of MK-8527
Time Frame: At designated time points (up to approximately 2 weeks)
Blood samples will be collected to determine t1/2 of MK-8527 in plasma.
At designated time points (up to approximately 2 weeks)
Apparent Clearance (CL/F) of MK-8527
Time Frame: At designated time points (up to approximately 2 weeks)
Blood samples will be collected to determine CL/F of MK-8527 in plasma.
At designated time points (up to approximately 2 weeks)
Apparent Volume of Distribution During Terminal Phase (Vz/F) of MK-8527
Time Frame: At designated time points (up to approximately 2 weeks)
Blood samples will be collected to determine Vz/F of MK-8527 in plasma.
At designated time points (up to approximately 2 weeks)
Number of Participants Who Discontinue Study Treatment Due to an AE
Time Frame: Up to approximately 8 weeks
An AE is any untoward medical occurrence in a participant, temporally associated with the use of study treatment, whether or not considered related to the study treatment. The number of participants who discontinue study treatment due to an AE will be reported.
Up to approximately 8 weeks

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.
Merck Sharp & Dohme LLC

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.
  • Study Director: Medical Director, Merck Sharp & Dohme LLC

Publications and helpful links

The person responsible for entering information about the study voluntarily provides these publications. These may be about anything related to the study.

Helpful Links

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.
June 22, 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.
December 22, 2026

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.
December 22, 2026

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.
May 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.
May 22, 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.
May 22, 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.
May 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.
May 1, 2026

More Information

Terms related to this study

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.
  • 8527-019
  • MK-8527-019 (Other Identifier: MSD)

Plan for Individual participant data (IPD)

Plan to Share Individual Participant Data (IPD)?

YES

IPD Plan Description

https://trialstransparency.msdclinicaltrials.com/pdf/ProcedureAccessClinicalTrialData.pdf

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

Yes

Studies a U.S. FDA-regulated device product

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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