What is the purpose of a spacer when using an MDI inhaler?

The purpose of a spacer when using a metered-dose inhaler (MDI) is to enhance the delivery of the medication. A spacer is a device that attaches to the inhaler, allowing the medication to be released into a chamber before it is inhaled. This design improves drug delivery by providing a space for the aerosolized medication to disperse and slow down. As a result, it allows for a more efficient inhalation of the medication into the lungs, reducing the likelihood of the medication settling in the mouth or throat and thereby minimizing side effects such as oral thrush.

Additionally, a spacer makes it easier for patients, particularly those with coordination difficulties, to effectively use the inhaler. By creating a larger volume for the inhaled medication to travel through, spacers help ensure that more medication reaches the lungs where it's needed, enhancing overall efficacy in treating conditions like asthma or chronic obstructive pulmonary disease (COPD).