Competence in metered-dose inhaler technique among healthcare workers of three general hospitals in Mexico: it is not good after all these years.

Introduction: Inhaled medication is the cornerstone of pharmacological treatment for chronic respiratory diseases. Therefore, it is important to use a metered-dose inhaler (MDI) correctly to get the appropriate dosage and benefit from the drug. Health-care workers (HCW) are responsible for teaching the correct MDI technique.