GENERAL REVIEW ON DRY POWDER INHALER FOR BRONCHODLATION IN PULMONARY DISEASE LIKE ASTHMA & COPD

This article discussed the brief about the asthma pathophysiology, The working principle of DPIs and its mechanism of action. Inhalers have been developed because of difficulty of using the conventional metered dose inhaler (MDI) and because of the impending ban on CFC's.DPIs in general are easier to use than the MDI and cause fewer irritant effects. DPIs contain micronized drug which is <5um in diameter. Unlike the MDI few patients develop a poor inhalation technique with continued use of DPI's. A report says the annual cost of treatment of asthma is more than 6 billion dollars per year in the United States of America, and the worldwide market for asthma medication is currently valued at 5.5 billion dollars each year. In this review paper the major discussion on asthma etiology ,classification of drug used to treat asthma and brief on how DPIs works, marked product advantages over others.