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Ensifentrine twice daily

Phase 3

COPD | Small molecule | Respiratory |Merck & Company, Inc.|Trials Updated: Apr 18, 2025

Ensifentrine twice daily target and mechanism

Molecular targetPDE3A, PDE3B, PDE4A, PDE4D, PDE4B, PDE4C
Target classInhibitor
ModalitySmall molecule

Success Probability

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Market & Valuation

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Trial Design

UNCONTROLLED
Total Trials1
Total Enrollment20

FDA Designations

No designations recorded

Ensifentrine twice daily clinical trials

Ensifentrine twice daily · 1 trial · 1 indication

Phase 3 1
NCT06460493Effect of Ensifentrine Treatment on CAT ScoreCOPD
COMPLETED20 Analytics
PHASE3COMPLETED
Effect of Ensifentrine Treatment on CAT Score
COPDUnlock trial analytics

Study Endpoints

Primary Endpoints

The Proportion of CAT Score Responders in the Full Analysis Set at Week 12
12 Weeks

Responders are defined as an improvement (decrease) from baseline of ≥2 points. The COPD Assessment Test(tm) (CAT) is a one-page, 8-item questionnaire suitable for completion by patients diagnosed with COPD. When completing the questionnaire, individuals rate their experience on a 6-point scale, ranging from 0 (no impairment) to 5 (maximum impairment) with a scoring range of 0-40. Higher scores indicate greater disease impact. The individual items are: Cough, Mucus, Chest Tight, Breathless, Limited Activities, Confident, Sleep and Energy). CAT was self-completed at baseline, week 6 and week 12.

Secondary Endpoints

The Proportion of CAT Score Responders in the Full Analysis Set at Week 6
6 Weeks
Mean Change From Baseline - CAT Score in the Full Analysis Set
At week 6 and week 12
Mean Change From Baseline - CAT Individual Item (1, Cough) in the Full Analysis Set
At week 6 and week 12
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Study Design & Arms

AllocationNA
MaskingNONE
ModelSINGLE_GROUP
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
EnsifentrineEXPERIMENTALInhaled ensifentrine twice daily for 12 weeks via standard jet nebulizer in addition to standard dual (LAMA/LABA) or triple (LAMA/LABA/ICS) COPD therapy.

Interventions

NameTypeDescription
Ensifentrine 3 mg twice dailyDRUGAll subjects will receive ensifentrine.
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Eligibility Criteria

Age Range40 Years to 80 Years
SexALL
Healthy VolunteersNo
Study Sites1

Inclusion Criteria: * Capable of giving informed consent. * Current or former cigarette smokers with a history of cigarette smoking ≥ 10 pack years. * Established clinical history of moderate to severe COPD. * Pre- and post-albuterol FEV1/FVC ratio of \< 0.70. * Post-albuterol FEV1 ≥ 30 % and ≤ 75%...

Countries:United States
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Frequently asked questions about Ensifentrine twice daily

What is ensifentrine twice daily?

Ensifentrine twice daily is an investigational small molecule being developed for chronic obstructive pulmonary disease, or COPD. It is given as a twice-daily dose, with the 3 mg twice-daily regimen also referred to as ensifentrine 3 mg twice daily. It is a Phase 3 candidate and has not been approved by the FDA.

What is ensifentrine twice daily used for in COPD?

Ensifentrine twice daily is being studied for the treatment of COPD, a chronic respiratory condition. The clinical program has evaluated its effect on COPD symptom burden, including a Phase 3 trial that measured changes in CAT score, a patient-reported assessment of COPD impact. It remains investigational for this indication.

What does ensifentrine twice daily target?

Ensifentrine twice daily inhibits the phosphodiesterase enzymes PDE3A, PDE3B, PDE4A, PDE4B, PDE4C, and PDE4D. By inhibiting these PDE3 and PDE4 subtypes, the drug acts as a dual phosphodiesterase inhibitor. This target profile is the basis for its development in respiratory disease such as COPD.

Who is developing ensifentrine twice daily?

Ensifentrine twice daily is being developed by Merck & Company, Inc., which trades under the ticker MRK. The company is the sponsor behind the clinical program for this small molecule in respiratory medicine.

What phase is ensifentrine twice daily in?

Ensifentrine twice daily is in Phase 3 development. It is an investigational therapy and is not FDA approved. The Phase 3 study in its program has been completed, and no trials for this asset are currently listed as active.

What clinical trials is ensifentrine twice daily in?

Ensifentrine twice daily has been studied in the Phase 3 trial NCT06460493, titled Effect of Ensifentrine Treatment on CAT Score. That trial enrolled 20 participants with COPD in the United States, had a minimum age of 40 years, and is now completed. It was an uncontrolled study.