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A Patient Guide For Metered Dose Inhalers

A Patient Guide For Metered Dose Inhalers

 

What are Metered Dose Inhalers?

 

 The parts of the MDI (metered dose inhaler) include the canister, medication/propellant, metering valve, actuator (or boot), and usually a dose counter. A picture below shows the MDI with its parts.(1)

 

Becker E, Holt TO, Wiles K, Myers T
Becker E, Holt TO, Wiles K, Myers T. AARC

 

  Different types of medications are used in MDIs. One includes a short acting beta-agonist, which binds to the smooth muscle in your lungs, and opens the airways. The other are corticosteroid medications that suppress airway inflammation.

 

How do I use my Metered Dose Inhaler?

 

Becker E, Holt TO, Wiles K, Myers T. AARC

 

  You will know when your MDI is empty because some have a dose counter. Make sure to read your medication guide for your MDI to determine how many puffs are available. Some devices will show you that there are 20 puffs available by having the counter box turn red.For ones that do not have a dose counter, you will have to manually count and record on paper including both priming and the therapy doses. This number is then subtracted from the number of puffs provided by the inhaler, which is shown in your medication guide.(1)

 

The Addition of A Spacer

 

Becker E, Holt TO, Wiles K, Myers T. AARC

 

References

1. Becker E, Holt TO, Wiles K, Myers T. A Patient’s Guide to Aerosol Medication Delivery, 3rd Edition, 2017. American Association for Respiratory Care. Aerosol medication delivery devices: pressurized metered dose inhalers. Available from: http://www.aarc.org/wp-content/uploads/2018/01/aerosol-guides-for-patients-3rd.pdf .
Accessed November 1, 2018
2. Newman SP. Principles of metered-dose inhaler design. Respiratory Care. 2005;50(9). 1177-1190. Available from: http://www.rcjournal.com/contents/09.05/09.05.1177.pdf .
Accessed November 1, 2018

Artur Dzhurinskiy
10 May, 2019

Written by

My name is Artur Dzhurinskiy and I graduated from St. Louis College of Pharmacy in 2014 with a doctor of pharmacy degree. Through my academics I gained valuable experience learning about various medications that are...read more: