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:: Section 4DPI (Dry Powder Inhaler)
A DPI is a breath-actuated metered-dosing system. With a DPI, the patient creates the aerosol by drawing air through a dose of finely milled drug powder. Dry powder inhalers are relatively inexpensive, do not need propellants, and do not require the hand-breath coordination needed for MDIs. However, dispersion of the powder into respirable particles depends on the creation of turbulent flow in the inhaler. A patient's ability to inhale the powder with a sufficiently high inspiratory flow rate is therefore important to its use.
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