Inhaled therapy is key to the management of chronic obstructive pulmonary disease (COPD). New drugs and inhalers have recently been launched or will soon become available, and the expiry of patent protection covering several currently used inhaled bronchodilators and corticosteroids will be accompanied by the development of bioequivalent, generic inhaled drugs. Consequently, a broader availability of branded and generic compounds will increase prescription opportunities. Given the time course of COPD, patients are likely to switch drugs and inhalers in daily practice. Switching from one device to another, if not accompanied by appropriate training for the patient, can be associated with poor clinical outcomes and increased use of health care resources. In fact, while it seems reasonable to prescribe generic inhaled drugs to reduce costs, inadequate use of inhaler devices, which is often associated with a poor patient-physician or patient-pharmacist relationship, is one of the most common reasons for failure to achieve COPD treatment outcomes. Further research is needed to quantify, as in asthma, the impact of inappropriate switching of inhalers in patients with COPD and show the outcomes related to the effect of using the same device for delivering inhaled medications.
Keywords: dry powder inhaler; inhaled corticosteroids; inhaled therapy; long-acting antimuscarinic agents; long-acting β2 agonists; metered-dose inhalers.