If you still use an albuterol inhaler propelled by chloroflourocarbons, take a deep breath and get ready to switch to an ozone-friendly version.

Chlorofluorocarbons deplete the earth's ozone layer, so they will be completely off the market by the end of this year, replaced by hydrofluoroalkane-powered inhalers.

Inhaled albuterol is one of the top 10 prescriptions in the U.S. The drug is used by patients with asthma, allergies, chronic obstructive lung disorders and other respiratory illnesses.

The Allergy and Asthma Network Mothers of Asthmatics urges physicians and patients to learn about differences between the older and newer inhalers. Hydrofluroalkane devices require proper inhalation technique, more frequent cleaning, and different priming to load the correct dose of medication.

The organization has created a web page with transition information: www.breatherville.org/MDITransition