What is a pMDI?
Pressurized metered dose inhaler (pMDI), also known as a puffer, is the most commonly used delivery device and is
most effective when used with a spacer. The canister of a metered dose inhaler contains
the medication in a solution or suspension. This pressurised canister is also
filled with a type of gas called hydrofluroalkane (HFA), that do not react with
the medication. When the canister is activated by pressing on the top of it
when it is attached to the mouthpiece, a small amount of this gas is released
and takes some of the medication with it. This vapour of air and medication is
then channelled through the mouthpiece and delivered to the lungs when the
patient inhales. Metered dose inhalers are designed so that each usage delivers
a precise amount of medication. A dose counter may be included to indicate the
number of doses that has been taken.
Advantages
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Limitations
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Step-by-Step Guide to Using a pMDI
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How to Maintain a pMDI?
Preventer and
combination pMDIs must never be wet or washed. They should only be wiped with a
dry tissue.
Reliever HFA inhalers must be cleaned on a regular basis to prevent medication build up and blockages. Most manufacturers recommend cleaning the mouthpiece at least once per week.
To clean:
Reliever HFA inhalers must be cleaned on a regular basis to prevent medication build up and blockages. Most manufacturers recommend cleaning the mouthpiece at least once per week.
To clean:
- Remove the medication canister and cap from the mouthpiece. Do not wash the canister or immerse it in water.
- Run warm tap water through the top and bottom of the plastic mouthpiece for 30 to 60 seconds.
- Shake off excess water and allow the mouthpiece to dry completely (overnight is recommended).
- If you need the inhaler before the mouthpiece is dry, shake off excess water, replace canister, and test spray twice (away from the face).
Authors: Loren Mundy, Uma Mageswari Sellvaraj, Ng Victoria, Nikhil Jotsingani