New inhaler propellant could be greener, but does it work?
NCT ID NCT05755932
First seen Jun 27, 2026 · Last updated Jun 27, 2026
Summary
This study tested a new propellant (HFO) for metered dose inhalers to see if it affects how the lungs clear mucus, compared to the standard propellant (HFA). Thirty-five healthy volunteers inhaled both types and had their lung clearance measured using a radioactive tracer and a special camera. The goal was to see if the new propellant is similar to the old one, which could lead to a more environmentally friendly inhaler.
What this could mean
Our plain-language read of the trial. This is informational only — not medical advice or a prediction.
Active substance
HFO-1234ze(E) propellant (inhaler propellant)
What this could lead to
If the new propellant works as well as the current one, it could lead to a more environmentally friendly inhaler option.
What could go wrong
This is a small, early-phase study in healthy people, not patients. The new propellant may not perform the same in people with lung disease.
Disclaimer
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the original study
.
Summaries may miss details or leave out important information. Before applying or accepting participation, make sure you have read and understood the full study. Curemydisease.com takes no responsibility whatsoever for anything missed, misunderstood, or acted upon as a result of our summary — we know it does not capture everything.
This is a summary of the original study . Summaries may miss details or leave out important information. Before applying or accepting participation, make sure you have read and understood the full study. Curemydisease.com takes no responsibility whatsoever for anything missed, misunderstood, or acted upon as a result of our summary — we know it does not capture everything.
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The condition terms exactly as the trial's registrant entered them.
Contacts and locations
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Locations
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Research Site
Kansas City, Kansas, 66160, United States
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Research Site
Baltimore, Maryland, 21287, United States
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Research Site
Chapel Hill, North Carolina, 27599, United States
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Research Site
Pittsburgh, Pennsylvania, 15213, United States
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Research Site
Glasgow, G4 0SF, United Kingdom