A Study to Evaluate Safety and Efficacy of TP-05 in Healthy Participants With Tick Exposure

July 8, 2026 updated by: Tarsus Pharmaceuticals, Inc.

A Phase 2b, Randomized, Double-Blind, Placebo-Controlled Study to Evaluate the Safety, Tolerability, Pharmacokinetics, and Efficacy of TP-05 in Healthy Participants at High Risk of Tick Exposure

This study is designed to evaluate the safety, tolerability, and pharmacokinetics of TP05 administered orally to healthy adult participants.

Study Overview

Status

Status

Indicates the current recruitment status or the expanded access status.
Active, not 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 randomized, double-blind, placebo-controlled study conducted in healthy adult participants prior to anticipated exposure to Lyme Borreliosis. Participants will be randomized to receive either TP05 or placebo according to a predefined dosing schedule. Safety will be evaluated through adverse event monitoring, clinical laboratory assessments, vital signs, and physical examinations. The study will consist of a screening period, a treatment period (up to 24 weeks) and a safety follow up period. Participants will be randomized to receive one of two treatment regimens of TP-05 or placebo. Participants will be followed up for approximately 15 months and evaluated further for tick bites or symptoms of Lyme borreliosis.

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 (Actual)

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.
722

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.
  • Name: Study Director
  • Phone Number: 949-418-1801

Study Locations

  • United States
    • Maryland
      • Pikesville, Maryland, United States, 21208
        • Study Site
    • Massachusetts
      • Brookline, Massachusetts, United States, 02445
        • Study Site
      • Fall River, Massachusetts, United States, 02723
        • Study Site
    • Minnesota
      • Minneapolis, Minnesota, United States, 55402
        • Study Site
    • New Jersey
      • Marlboro, New Jersey, United States, 07746
        • Study Site
    • New York
      • Albany, New York, United States, 12205
        • Study Site
      • Binghamton, New York, United States, 13905
        • Study Site
      • Buffalo, New York, United States, 14217
        • Study Site
      • East Syracuse, New York, United States, 13057
        • Study Site
      • Middletown, New York, United States, 10941
        • Study Site
      • New York, New York, United States, 10036
        • Study Site
      • Rochester, New York, United States, 14609
        • Study Site
    • Pennsylvania
      • Erie, Pennsylvania, United States, 16508
        • Study Site
      • Hatboro, Pennsylvania, United States, 19040
        • Study Site
      • Philadelphia, Pennsylvania, United States, 19107
        • Study Site
      • Pittsburgh, Pennsylvania, United States, 15236
        • Study Site
      • Pottstown, Pennsylvania, United States, 19464
        • Study Site
      • West Chester, Pennsylvania, United States, 19380
        • Study Site
    • Rhode Island
      • Warwick, Rhode Island, United States, 02886
        • Study Site

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
  • Older Adult

Accepts Healthy Volunteers

Yes

Description

Inclusion Criteria:

  • Overtly healthy adult participants aged 18 to 70 years
  • Able to provide written informed consent
  • Willing and able to comply with study procedures
  • At high risk of exposure to ticks
  • Contraceptive use by men and women consistent with local regulations

Exclusion Criteria:

  • Prior exposure to TP05 or any isooxazoline in the last 12 months
  • Known hypersensitivity to TP05 or related compounds
  • Clinically significant medical conditions that may interfere with study participation
  • Use of investigational products within 30 days prior to screening.
  • Received previous vaccination against Lyme borreliosis, including investigational vaccines intended to prevent Lyme borreliosis
  • Receiving long-term antibiotic therapy
  • Received active or passive immunization within 4 weeks prior to Day
  • Pregnant or breastfeeding individuals

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: Double

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.
Active Comparator: TP-05 (lotilaner) High Dose
Oral Tablet
Drug: TP-05 (lotilaner) High Dose
TP05 administered orally at the protocol-defined preventative dose.
Placebo Comparator: Placebo
Oral Tablet
Drug: Placebo
Matching placebo administered orally according to the same dosing schedule as TP05.
Active Comparator: TP-05 (lotilaner) Low Dose
Oral Tablet
Drug: TP-05 (lotilaner) Low Dose
TP05 administered orally at the protocol-defined preventative dose.

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
The Incidence of Treatment Emergent Adverse Events From Baseline
Time Frame: From day 1 through the end of study follow-up, an average of 15 months.
Safety and tolerability will be evaluated by incidence rate of treatment emergent adverse events from baseline.
From day 1 through the end of study follow-up, an average of 15 months.
Clinically Significant Changes From Baseline Chemistry Laboratory Tests
Time Frame: From day 1 through the end of study follow up, an average of 15 months.
Number of participants with clinically significant changes in clinical laboratory tests
From day 1 through the end of study follow up, an average of 15 months.
Clinically Significant Changes From Baseline Hematology Laboratory Tests
Time Frame: From day 1 through the end of study follow up, an average of 15 months.
Number of participants with clinically significant changes in clinical laboratory tests.
From day 1 through the end of study follow up, an average of 15 months.
Clinically Significant Changes From Baseline Vital Signs
Time Frame: From day 1 through the end of study follow up, an average of 15 months.
Number of participants with clinically significant changes in vital signs.
From day 1 through the end of study follow up, an average of 15 months.
Clinically Significant Changes From Baseline Electrocardiograms (ECGs)
Time Frame: From day 1 through the end of study follow up, an average of 15 months.
Safety will be assessed by evaluating clinically significant changes from Baseline ECGs change in mean ventricular rate [beats/min].
From day 1 through the end of study follow up, an average of 15 months.
Clinically Significant Changes From Baseline Electrocardiograms (ECGs) Measures
Time Frame: From day 1 through the end of study follow up, an average of 15 months.
Safety will be assessed by evaluating clinically significant changes from Baseline ECGs change in pulse rate [msec].
From day 1 through the end of study follow up, an average of 15 months.
Clinically Significant Changes From Baseline QTC Interval
Time Frame: From day 1 through the end of study follow up, an average of 15 months.
Safety will be assessed by evaluating clinically significant changes from Baseline ECGs change in QTC interval
From day 1 through the end of study follow up, an average of 15 months.
Clinically Significant Changes From Baseline QRS Interval
Time Frame: From day 1 through the end of study follow up, an average of 15 months.
Safety will be assessed by evaluating clinically significant changes from Baseline ECGs change in QRS interval.
From day 1 through the end of study follow up, an average of 15 months.

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
Concentration of Lotilaner in Whole Blood
Time Frame: From dose through study completion, an average of 15 months.
Concentration of lotilaner in whole blood at specified timepoints measured using validated bioanalytical assays.
From dose through study completion, an average of 15 months.
Terminal Elimination Half Life (t½) of Lotilaner
Time Frame: At protocol specified timepoints through end study treatment phase, an average of 28 weeks.
Terminal elimination half life (t½) of lotilaner.
At protocol specified timepoints through end study treatment phase, an average of 28 weeks.
Area Under the Concentration Time Curve (AUC) of Lotilaner
Time Frame: At protocol specified timepoints through end of pharmacokinetic sampling, an average of 15 months.
Area under the concentration time curve (AUC) of lotilaner.
At protocol specified timepoints through end of pharmacokinetic sampling, an average of 15 months.
Maximum Observed Concentration (Cmax) of Lotilaner
Time Frame: At protocol specified timepoints through end of pharmacokinetic sampling, an average of 15 months.
Maximum observed concentration (Cmax) of lotilaner.
At protocol specified timepoints through end of pharmacokinetic sampling, an average of 15 months.
Time to Maximum Observed Concentration (Tmax) of Lotilaner
Time Frame: At protocol specified timepoints through end of pharmacokinetic sampling, an average of 15 months.
Time to maximum observed concentration (Tmax) of lotilaner.
At protocol specified timepoints through end of pharmacokinetic sampling, an average of 15 months.

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.
Tarsus Pharmaceuticals, Inc.

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.
PPD Development, LP

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 (Actual)

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.
March 9, 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.
October 1, 2027

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 1, 2027

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).
March 30, 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.
April 24, 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 1, 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.
July 9, 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.
July 8, 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.
July 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.
  • TRS-018

Plan for Individual participant data (IPD)

Plan to Share Individual Participant Data (IPD)?

NO

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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