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Do patients show the same level of adherence with all dry powder inhalers?

Poor adherence with inhaled therapy presents a considerable problem. In the UK, non‐adherence is estimated to occur in 10–46% of those prescribed inhaled corticosteroids and may contribute to an estimated 18–48% of asthma deaths. Before dry powder inhalers can be considered interchangeable, it is important to check that adherence is unaffected by any switching of the device dispensed to patients.