Heather Swanson, MD

Dry powder inhalers are used by millions of patients with asthma or chronic obstructive pulmonary disease. Although these devices are easier to use than metered-dose inhalers, errors still occur and drug efficacy may be reduced or lost.

Millions of people with asthma and chronic obstructive pulmonary disease (COPD) use dry powder inhalers (DPIs). These devices are generally easier to use than metered-dose inhalers; however, errors still occur that may reduce the effectiveness of the drug.