The ozone layer and metered dose inhalers.
The stratospheric ozone layer plays a crucial role in protecting living organisms against ultraviolet radiation. Chlorofluorocarbons (CFC) contained in metered-dose inhalers (MDIs) contribute to ozone depletion and in accordance with the Montreal Protocol on Substances That Deplete the Ozone Layer established 10 years ago, phase-out strageies have been developed worldwide for this category of agents. Alternatives to CFC-containing inhalers have been developed, such as powder inhalers and those using hydrofluoroalkanes (HFAs) as propellants, which have been shown to be as safe and effective as CFC-containing inhalers and even offer interesting advantages over older inhalers. The transition to non-CFC MDIs requires a major effort to make the new products available and to ensure adequate comparision with the previous ones. It also requires a harmonization of actions taken by industry, government, licencing bodies and patients or health professional associations to ensure adequate information and education to the public and respiratory care providers.
Institut de cardiologie et de pneumologie de l'Université Laval, Sainte-Foy, Canada. lpboulet@med.ulaval.ca
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D017402:Chlorofluorocarbons; D004782:Environmental Health; D004867:Equipment Design; D006801:Humans; D009330:Nebulizers and Vaporizers; D010126:Ozone
D017402:Chlorofluorocarbons; D010126:Ozone