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L606

Phase 3

Pulmonary Arterial Hypertension | Small molecule | Cardiovascular |Liquidia Corporation|Last Updated: Sep 2, 2026

Target and mechanism

Molecular targettreprostinil
ModalitySmall molecule

Also known as L606 inhalation suspension

Success Probability

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Market & Valuation

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Trial Design

UNCONTROLLED
Total Trials1
Total Enrollment28

FDA Designations

No designations recorded

Clinical trial landscape

L606 · 2 trials · 3 indications

Phase 3 2
NCT07285655A Phase 3 Study to Evaluate the Safety and Efficacy L606 in Participants With PH-ILDPulmonary Hypertension Due to Lung Disease (Disorder)
RECRUITING344 Analytics
NCT04691154A Phase 3 Study to Evaluate the Safety and Tolerability of L606 in Subjects With PAH or PH-ILDPulmonary Arterial Hypertension
ACTIVE NOT_RECRUITING28 Analytics
PHASE3RECRUITING
A Phase 3 Study to Evaluate the Safety and Efficacy L606 in Participants With PH-ILD
Pulmonary Hypertension Due to Lung Disease (Disorder)Unlock trial analytics
PHASE3ACTIVE NOT_RECRUITING
A Phase 3 Study to Evaluate the Safety and Tolerability of L606 in Subjects With PAH or PH-ILD
Pulmonary Arterial HypertensionUnlock trial analytics

Study Endpoints

Primary Endpoints

Change from baseline in 6-minute walk distance (6MWD) as evaluated by the 6-minute walk test (6MWT)
16 weeks
Safety/Tolerability assessed by incidence of treatment-emergent AEs/SAEs
2 weeks

(MSP for Cohort A): Proportion of patients with PAH or PH-ILD on a stable Tyvaso dose who would develop treatment-emergent AEs/SAEs after switching to L606 dosing for up to 2 weeks during MSP.

Safety/Tolerability assessed by incidence of treatment-emergent AEs/SAEs (long-term)
48 weeks

(OEP for Cohorts A and B): Proportion of subjects with PAH or PH-ILD, choosing to continue twice daily L606 dosing for up to 48 weeks, who would develop treatment emergent AEs/SAEs up to 48 hours after the last dose.

Secondary Endpoints

Time to first occurrence of: -Death -Hospitalization due to a cardio-pulmonary indication related to underlying disease -Lung transplant -Decrease in 6MWD > 15% from Baseline related to disease under study at 2 consecutive visits >1 week apart
24 weeks
Change from baseline in 6-minute walk distance (6MWD) as evaluated by the 6-minute walk test (6MWT)
16 weeks
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Study Design & Arms

AllocationRANDOMIZED
MaskingQUADRUPLE
ModelPARALLEL
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
L606 (in combination with nebulizer)EXPERIMENTAL -
Placebo (in combination with nebulizer)PLACEBO_COMPARATOR -
L606EXPERIMENTAL -

Interventions

NameTypeDescription
L606DRUGL606 is a liposomal version of treprostinil intended for delivery via oral inhalation using a study issued nebulizer.
PlaceboDRUGPlacebo will match L606 but contain no treprostinil.
L606 inhalation suspensionCOMBINATION_PRODUCTL606 inhalation suspension
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Eligibility Criteria

Age Range18 Years to 80 Years
SexALL
Healthy VolunteersNo
Study Sites36

Inclusion Criteria: * Participant is between 18 years to 80 years old. * Has a confirmed diagnosis of ILD based on High Resolution Computed Tomography (HRCT) chest imaging. * Evidence of PH as demonstrated from Right Heart Catheterization (RHC) with the following hemodynamic parameters: * Pulmonary...

Countries:United StatesAustraliaAustriaBelgiumFranceGermanyItalyLatviaPortugalSpainUnited Kingdom
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Recent Changes (Last 90 Days)

LOWSep 2, 2026NCT07285655lastUpdatePostDate: changed
LOWSep 2, 2026NCT07285655lastUpdatePostDate: changed
LOWSep 2, 2026NCT07285655lastUpdatePostDate: changed
LOWJun 29, 2026NCT07285655lastUpdatePostDate: changed
LOWJun 29, 2026NCT07285655lastUpdatePostDate: changed
LOWJun 18, 2026NCT07285655lastUpdatePostDate: changed
LOWJun 18, 2026NCT07285655lastUpdatePostDate: changed
LOWJun 18, 2026NCT07285655lastUpdatePostDate: changed
LOWJun 18, 2026NCT07285655lastUpdatePostDate: changed

Frequently asked questions about L606

What is L606 used for?

L606 is an investigational small molecule being developed for Pulmonary Arterial Hypertension (PAH) and Pulmonary Hypertension Due to Lung Disease (PH-ILD). It is administered as an inhalation suspension. The drug is currently in Phase 3 clinical development and has not been approved by the FDA.

What does L606 target?

L606 targets treprostinil, a prostacyclin analog. Treprostinil works by relaxing blood vessels in the lungs, which helps reduce pulmonary blood pressure. This mechanism is relevant for treating conditions like Pulmonary Arterial Hypertension and Pulmonary Hypertension Due to Lung Disease.

Who makes L606?

L606 is being developed by Liquidia Corporation, a biopharmaceutical company traded on the Nasdaq under the ticker symbol LQDA. The company is conducting Phase 3 clinical trials to evaluate the safety and efficacy of L606 in patients with pulmonary hypertension.

What phase is L606 in?

L606 is in Phase 3 clinical development. It is currently being studied in two Phase 3 trials: one evaluating safety and efficacy in PH-ILD patients and another assessing safety and tolerability in patients with PAH or PH-ILD. The drug remains investigational and is not yet approved.

What clinical trials is L606 in?

L606 is being evaluated in two Phase 3 trials. NCT07285655 is a study of 344 participants with PH-ILD, recruiting across multiple countries including the US, Australia, and several European nations. NCT04691154 is a smaller study of 28 participants with PAH or PH-ILD, active in the US.

Is L606 the same as L606 inhalation suspension?

Yes, L606 is also known as L606 inhalation suspension. This refers to the drug's formulation as an inhaled suspension for treating pulmonary hypertension. The alternative name is used in clinical trial documentation to specify the route of administration.