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PN-881

Phase 1

Healthy Volunteer | Small molecule | Other |Protagonist Therapeutics, Inc.|Last Updated: Aug 5, 2026

Success Probability

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Market & Valuation

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Trial Design

RandomizedDouble-BlindPLACEBO_CONTROLLED
Total Trials1
Total Enrollment146

FDA Designations

No designations recorded

Clinical trial landscape

PN-881 · 1 trial · 1 indication

Phase 1 1
NCT07153146Safety, Tolerability, Pharmacokinetics, and Pharmacodynamics of PN-881 in Healthy Subjects.Healthy Volunteer
COMPLETED146 Analytics
PHASE1COMPLETED
Safety, Tolerability, Pharmacokinetics, and Pharmacodynamics of PN-881 in Healthy Subjects.
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Study Endpoints

Primary Endpoints

Incidence and severity of treatment-emergent adverse events (TEAEs)
Predose to 7 days after last dose

Evaluate the safety and tolerability of PN-881 in comparison to placebo after single and multiple doses in healthy subjects assessed for severity, seriousness, and relation to the investigational product.

Secondary Endpoints

Maximum observed plasma concentration (Cmax) of PN-881
48 hours following the first dose and the last dose
Area under the plasma concentration-time curve (AUC) of PN-881
Predose to 48 hours after the first and last dose.
Levels of biomarker in serum
Day 1 Predose up to 48 hours post (last) dose
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Study Design & Arms

AllocationRANDOMIZED
MaskingDOUBLE
ModelSEQUENTIAL
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
PN-881 Oral Solution Single Ascending DoseEXPERIMENTALPN-881 Oral Solution Single Ascending Dose
Placebo Oral Solution Single Ascending DosePLACEBO_COMPARATORPlacebo single ascending doses
PN-881 Oral Solution Multiple Ascending DoseEXPERIMENTALPN-881 Multiple Ascending Doses
Placebo Oral Solution Multiple Ascending DosePLACEBO_COMPARATORPlacebo, multiple ascending doses
PN-881 Oral Tablet Single DoseEXPERIMENTALPN-881 oral tablet single dose
PN-881 Oral Tablet Multiple DoseEXPERIMENTALPN-881 oral tablet multiple dose

Interventions

NameTypeDescription
PN-881 Oral SolutionDRUGPN-881 Oral Solution
PN-881 Oral TabletDRUGPN-881 oral tablet
PlaceboDRUGPlacebo
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Eligibility Criteria

Age Range18 Years to 65 Years
SexALL
Healthy VolunteersYes
Study Sites1

Inclusion Criteria: 1. Healthy male and female participants of non-childbearing potential, aged 18-65 years inclusive 2. Body mass index (BMI) between 18 and 32 kg/m² (inclusive) at screening 3. Willing and able to comply with all study requirements and provide written informed consent 4. Male part...

Countries:Australia
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Recent Changes (Last 90 Days)

HIGHAug 5, 2026NCT07153146Status: RECRUITING → COMPLETED

Frequently asked questions about PN-881

What is PN-881 used for?

PN-881 is an investigational small molecule being studied for use in healthy volunteers. It is currently in Phase 1 clinical development, with a completed trial evaluating its safety, tolerability, pharmacokinetics, and pharmacodynamics in healthy subjects. It is not approved for any indication.

Who is developing PN-881?

PN-881 is being developed by Protagonist Therapeutics, Inc., a biopharmaceutical company. The company is listed on the stock exchange under the ticker symbol PTGX. The drug is currently in Phase 1 clinical development, with one completed trial in healthy volunteers.

What phase is PN-881 in?

PN-881 is in Phase 1 clinical development. A Phase 1 trial has been completed, which studied the drug in healthy volunteers. The drug is investigational and has not been approved by regulatory authorities. It is not yet in later-stage clinical trials.

What clinical trials is PN-881 in?

PN-881 has one completed Phase 1 clinical trial, identified as NCT07153146. This trial was titled "Safety, Tolerability, Pharmacokinetics, and Pharmacodynamics of PN-881 in Healthy Subjects." It enrolled 146 participants in Australia and was a randomized, double-blind, placebo-controlled study.

Is PN-881 FDA approved?

PN-881 is not FDA approved. It is an investigational drug currently in Phase 1 clinical development. A Phase 1 trial in healthy volunteers has been completed, but the drug has not yet received regulatory approval for any use. Further clinical studies would be needed for approval.