metered dose inhalers
Last edited 11/2019
The convenience and apparent simplicity of the pressurised metered dose inhalers (pMDIs) makes them attractive.
The patient needs to co-ordinate inhalation and actuation of the MDI to ensure adequate topical delivery of the drug. Even with optimal technique 90% of the drug is deposited in the oropharynx.
Less than optimal inhaling technique is seen in around 50% of pMDI users (2). Periodic checking of inhaler technique should be performed, particularly if there are problems with control.
If there are significant problems with technique a spacer device or breath actuated pMDI may be indicated (1).
Reference:
- (1) National Institute for Health and Clinical Excellence (NICE) 2008. Inhaled corticosteroids for the treatment of chronic asthma in adults and in children aged 12 years and over.
- (2) National Institute for Health and Clinical Excellence (NICE) 2002. Inhaler devices for routine treatment of chronic asthma in older children (aged 5 - 15 years)