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What propellants are in metered dose inhalers?

dose inhalers metered propellants
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What propellants are in metered dose inhalers?

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The metered dose inhaler (MDI) was developed in the 1950s. The propellant used in MDIs until recently contained CFCs (Chlorofluorocarbons). You may find when you replace your MDI that a different propellant is used in the inhaler. This is an HFA (hydrofluoroalkane) propellant.

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