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

Not yet recruiting

Conditions

Intervention / Treatment

Study Type

Interventional

Enrollment (Estimated)

14

Phase

  • 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

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
Intervention / Treatment
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

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

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

Merck Sharp & Dohme LLC

Investigators

  • 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)

June 22, 2026

Primary Completion (Estimated)

December 22, 2026

Study Completion (Estimated)

December 22, 2026

Study Registration Dates

First Submitted

May 15, 2026

First Submitted That Met QC Criteria

May 15, 2026

First Posted (Actual)

May 22, 2026

Study Record Updates

Last Update Posted (Actual)

May 22, 2026

Last Update Submitted That Met QC Criteria

May 15, 2026

Last Verified

May 1, 2026

More Information

Terms related to this study

Additional Relevant MeSH Terms

Other Study ID 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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