Definition: A dry powder inhaler, or DPI for short, is a type of inhaler device for administering asthma medicine. It is similar to a metered dose inhaler, but the medication is in powder form, rather than in liquid form. You inhale a puff of the powder, rather than a mist of liquid.
Dry Powder Inhaler (DPI)
From About.com
Updated: July 31, 2008
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