Tip - How to use your metered dose inhaler

A metered dose inhaler (MDI), also known as an aerosol inhaler or puffer, is a device for delivering medicine directly into the lungs. It consists of a pressurised metal canister containing a solution or suspension of medicine, placed within a plastic case with a mouthpiece. When the canister is pushed down, a valve delivers a measured dose of medicine in a fine mist. This is inhaled into the lungs via the mouthpiece. Using an inhaler delivers your medicine directly into the lungs where it is needed.
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