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SION-451

Phase 1

Cystic Fibrosis (CF) | Small molecule | Respiratory |Sionna Therapeutics, Inc.|Trials Updated: Sep 10, 2026

SION-451 development status

Highest phase Phase 1
Registered trials 1 across 1 sponsor since Jun 2025

SION-451 target and mechanism

Molecular targetCFTR
Target classProtein
ModalitySmall molecule

Success Probability

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Market & Valuation

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Trial Design

RandomizedDouble-BlindPLACEBO_CONTROLLED
Total Trials1
Total Enrollment120

FDA Designations

No designations recorded

SION-451 clinical trials

SION-451 · 1 trial · 1 indication

Phase 1 1
NCT07035990Safety, Tolerability, and Pharmacokinetics of Multiple Dose Combinations of SION-451 and Complementary Modulators SION-2222 and SION-109 in Healthy Participants.Cystic Fibrosis (CF)
COMPLETED120 Analytics
PHASE1COMPLETED
Safety, Tolerability, and Pharmacokinetics of Multiple Dose Combinations of SION-451 and Complementary Modulators SION-2222 and SION-109 in Healthy Participants.
Cystic Fibrosis (CF)Unlock trial analytics

Study Endpoints

Primary Endpoints

To evaluate the incidence of treatment emergent adverse events [Safety and Tolerability] of SION-451 and SION-109 when administered in combination to healthy participants
From Day 1 through day 21

Adverse reactions to the study drug combination SION-451 and SION-109 will be measured.

To evaluate the incidence of treatment emergent adverse events [Safety and Tolerability] of SION-451 and SION-2222 when administered in combination to healthy participants
From Day 1 through day 21

Adverse events to the study drug combination SION-451 and SION-2222 will be measured

Secondary Endpoints

Cmax of SION-451 and SION-2222 in plasma when administered in combination to healthy participants
From Day 1 through day 17
Tmax of SION-451 and SION-2222 in plasma when administered in combination to healthy participants
From Day 1 through day 17
AUC of SION-451 and SION-2222 in plasma when administered in combination to healthy participants
From Day 1 through day 17
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Study Design & Arms

AllocationRANDOMIZED
MaskingQUADRUPLE
ModelPARALLEL
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
SION-451 + SION-2222EXPERIMENTALAll participants who receive SION-451 in combination with SION-2222
Placebo matched to SION-451 and SION-2222PLACEBO_COMPARATOR -
SION 451 + SION 109EXPERIMENTALAll participants who receive SION-451 in combination with SION-109
Placebo matched to SION-451 and SION-109PLACEBO_COMPARATOR -

Interventions

NameTypeDescription
SION-451DRUG* Pharmaceutical form: tablet * Route of administration: oral
SION-2222DRUG* Pharmaceutical form: capsule * Route of administration: oral
SION-109DRUG* Pharmaceutical form: tablet * Route of administration: oral
Placebo SION-451DRUGPlacebo matched to SION-451
Placebo SION-2222DRUGPlacebo matched to SION-2222
Placebo SION-109DRUGPlacebo matched to SION-109
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Eligibility Criteria

Age Range18 Years to 55 Years
SexALL
Healthy VolunteersYes
Study Sites2

Inclusion Criteria: 1. Healthy male or female adult participants aged 18 to 55 years, inclusive, at the time of consent. 2. Weight of at least 45 kg and body mass index between 18.0 and 32.0 kg/m2, inclusive, at Screening. 3. Participant is willing to abstain from alcohol, caffeine, smoking and nic...

Countries:Australia
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Competitive Landscape -Cystic Fibrosis 20 trials (matched to "Cystic Fibrosis (CF)")

Recent Changes (Last 90 Days)

MEDIUMOct 11, 2026NCT07035990TRIAL_REMOVED: changed
MEDIUMOct 11, 2026NCT07035990TRIAL_REMOVED: changed
MEDIUMOct 11, 2026NCT07035990TRIAL_REMOVED: changed
MEDIUMOct 11, 2026NCT07035990TRIAL_REMOVED: changed
HIGHSep 10, 2026NCT07035990Status: RECRUITING → COMPLETED
HIGHSep 10, 2026NCT07035990Status: RECRUITING → COMPLETED

Frequently asked questions about SION-451

What is SION-451 used for in cystic fibrosis?

SION-451 is an investigational small molecule being developed for cystic fibrosis, a respiratory disease. It is designed to be used in combination with complementary modulators SION-2222 and SION-109. Sionna Therapeutics is evaluating the combination in clinical trials, and SION-451 has not been approved for any use.

What does SION-451 target?

SION-451 targets CFTR, the cystic fibrosis transmembrane conductance regulator protein. CFTR dysfunction is the underlying cause of cystic fibrosis. By targeting this protein, SION-451 is intended to modulate CFTR activity as part of a combination regimen with SION-2222 and SION-109.

Who is developing SION-451?

SION-451 is being developed by Sionna Therapeutics, Inc., which trades under the ticker SION. The company is advancing the compound for cystic fibrosis as part of a combination approach with its other modulators.

What phase is SION-451 in?

SION-451 is in Phase 1 clinical development. It is investigational and has not been approved by the FDA or any regulatory agency. The Phase 1 program has evaluated the drug in healthy participants.

What clinical trials is SION-451 in?

SION-451 has been studied in a Phase 1 trial, NCT07035990, titled Safety, Tolerability, and Pharmacokinetics of Multiple Dose Combinations of SION-451 and Complementary Modulators SION-2222 and SION-109 in Healthy Participants. The trial was completed, enrolled 120 participants, and was conducted in Australia.

Is SION-451 the same as SION-2222 or SION-109?

No. SION-451, SION-2222, and SION-109 are distinct small molecule modulators developed by Sionna Therapeutics. They are studied together as a combination regimen, but each is a separate investigational compound.