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TNX-103

Phase 3

Pulmonary Hypertension | Small molecule | Cardiovascular |Tenax Therapeutics, Inc.|Last Updated: Sep 9, 2026

Success Probability

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Market & Valuation

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Trial Design

RandomizedDouble-BlindPLACEBO_CONTROLLEDDMC
Total Trials1
Total Enrollment230

FDA Designations

No designations recorded

Clinical trial landscape

TNX-103 · 3 trials · 2 indications

Phase 3 3
NCT07436689Long-Term Open-Label Extension Study of Oral LevosimendanPulmonary Hypertension Associated With HFpEF
ENROLLING BY_INVITATION800 Analytics
NCT07288398LEVEL-2: LEVosimendan to Improve Exercise Limitation in Patients With PH-HFpEF-2Pulmonary Hypertension Associated With HFpEF
RECRUITING540 Analytics
NCT05983250LEVosimendan to Improve Exercise Limitation in Patients With PH-HFpEFPulmonary Hypertension
ACTIVE NOT_RECRUITING230 Analytics
PHASE3ENROLLING BY_INVITATION
Long-Term Open-Label Extension Study of Oral Levosimendan
Pulmonary Hypertension Associated With HFpEFUnlock trial analytics
PHASE3RECRUITING
LEVEL-2: LEVosimendan to Improve Exercise Limitation in Patients With PH-HFpEF-2
Pulmonary Hypertension Associated With HFpEFUnlock trial analytics
PHASE3ACTIVE NOT_RECRUITING
LEVosimendan to Improve Exercise Limitation in Patients With PH-HFpEF
Pulmonary HypertensionUnlock trial analytics

Study Endpoints

Primary Endpoints

The incidence (i.e., the percentage of patients who experience at least 1 occurrence) of select AE/SAEs
From enrollment through study completion (up to 3 years)

The incidence (i.e., the percentage of patients who experience at least 1 occurrence) of select AE/SAEs will be tabulated by system organ class and preferred term.

6-Minute Walk Distance (6MWD)
26 weeks

Change in 6-minute walk distance

Change in Six-minute walk distance
12 weeks

Secondary Endpoints

KCCQ (Kansas City Cardiomyopathy Questionnaire) score is a standardized measure that ranges from 0 to 100, where a higher score indicates better health.
26 weeks
Clinical Worsening Events
26 weeks
Clinical Worsening Event
26 weeks
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Study Design & Arms

AllocationNA
MaskingNONE
ModelSINGLE_GROUP
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
TNX-103EXPERIMENTALOpen-label oral levosimendan 1-3mg
PlaceboPLACEBO_COMPARATORMatching placebo (oral)

Interventions

NameTypeDescription
TNX-103DRUGOpen-label oral levosimendan 1-3mg
PlaceboDRUGMatching placebo (oral)
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Eligibility Criteria

Age Range18 Years to 85 Years
SexALL
Healthy VolunteersNo
Study Sites9

Inclusion Criteria: * Completed a TNX-103 parent study * Investigator confirmation that participant may derive clinical benefit from continued access to TNX-103 * Requirements related to childbearing potential, contraception, and egg/sperm donation Exclusion Criteria: * Investigator or Sponsor op...

Countries:United StatesArgentinaAustriaBrazilBulgariaCzechiaFranceGermanyHungaryItalyPolandSouth KoreaSpainTaiwanUnited KingdomCanada
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Recent Changes (Last 90 Days)

LOWSep 9, 2026NCT07436689lastUpdatePostDate: changed
LOWSep 9, 2026NCT07436689lastUpdatePostDate: changed
LOWAug 20, 2026NCT07288398lastUpdatePostDate: changed
LOWAug 20, 2026NCT07288398lastUpdatePostDate: changed
LOWAug 20, 2026NCT07288398lastUpdatePostDate: changed
LOWAug 20, 2026NCT07288398lastUpdatePostDate: changed
LOWJul 24, 2026NCT05983250primaryCompletionDate: changed
LOWJul 24, 2026NCT05983250primaryCompletionDate: changed
MEDIUMJul 21, 2026NCT05983250Status: RECRUITING → ACTIVE_NOT_RECRUITING
LOWJul 20, 2026NCT07436689lastUpdatePostDate: changed
LOWJul 20, 2026NCT07436689lastUpdatePostDate: changed

Frequently asked questions about TNX-103

What is TNX-103 used for?

TNX-103 is an investigational small molecule being developed for pulmonary hypertension, specifically pulmonary hypertension associated with heart failure with preserved ejection fraction (HFpEF). It is currently in Phase 3 clinical trials to evaluate its effect on exercise limitation in patients with these conditions.

What does TNX-103 target?

TNX-103 is oral levosimendan, a calcium sensitizer that enhances cardiac contractility without increasing oxygen demand. It also opens ATP-sensitive potassium channels, leading to vasodilation. These actions are being studied in the context of pulmonary hypertension associated with HFpEF.

Who makes TNX-103?

TNX-103 is being developed by Tenax Therapeutics, Inc., a biopharmaceutical company traded on NASDAQ under the ticker symbol TENX. The company is conducting Phase 3 clinical trials to assess the drug's efficacy in treating pulmonary hypertension.

What phase is TNX-103 in?

TNX-103 is in Phase 3 clinical development. It is not yet approved by regulatory authorities and remains investigational. There are two active Phase 3 trials and one additional Phase 3 open-label extension study, all focused on pulmonary hypertension associated with HFpEF.

What clinical trials is TNX-103 in?

TNX-103 is being studied in two active Phase 3 trials: NCT05983250 (LEVosimendan to Improve Exercise Limitation in Patients With PH-HFpEF) and NCT07288398 (LEVEL-2). Additionally, there is an open-label extension study, NCT07436689, enrolling patients who completed prior trials.

Is TNX-103 the same as levosimendan?

Yes, TNX-103 is oral levosimendan. The drug is being developed under the brand name TNX-103 by Tenax Therapeutics. Clinical trials refer to it as oral levosimendan, and it is being investigated for the treatment of pulmonary hypertension associated with HFpEF.