Asthma: Using A Metered-dose Inhaler: What Is A Metered Dose Inhaler

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What is a metered-dose inhaler?

A metered-dose inhaler (MDI) is a handheld device that delivers a measured dose of medicine directly to your lungs. The medicine is usually in an aerosol form.

Using a spacer with an MDI is the most efficient way to get the most medicine to your lungs. A spacer functions as a "holding" area for the medicine before you inhale. Using a spacer with your MDI can improve the delivery of the medicine and help you if you have problems with releasing the medicine as you inhale. It might help to practice using the MDI and spacer in front of the mirror. A spacer should always be used with inhaled corticosteroids to avoid side effects.

An MDI can be used to give different types of medicine. The type of medicine in your inhaler will depend on what type of medicine you need to treat your specific condition. For example, the inhaler may contain a medicine to prevent an asthma attack or medicine to help relieve the symptoms of COPD.

For some medicines, you may need a certain type of MDI. Always check with your doctor and pharmacist when getting a new MDI.

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Last updated:	May 08, 2008
Author:	Maria G. Essig, MS, ELS
Reviewed By:	Caroline S. Rhoads, MD - Internal Medicine, Ken Y. Yoneda, MD - Pulmonology
Editors:	Susan Van Houten, RN, BSN, MBA, Pat Truman, MATC