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.
This is an AI summary of the original study and may miss details. Read our disclaimer.
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As listed by the trial registrant
The condition terms exactly as the trial's registrant entered them.
Contacts and locations
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