A<unk>  <unk>  is a device that helps deliver a specific amount of medication to the lungs. It is commonly used to treat asthma, chronic obstructive pulmonary disease (COPD), and other respiratory problems. Because of normal naming conventions,<unk> s are considered aerosolized.
An<unk>  consists of 2 major components. The canister and a mouthpiece. The canister itself consists a metering<unk>  valve with an actuating stem, with the inside containing the aerosol propellant and medication.  The mouthpiece contains the mating discharge nozzle and generally includes a dust cap to prevent contamination.
Once assembled the patient then uses the<unk>  by pressing down on the top of the canister, with their thumb supporting lower portion of the mouthpiece, thus releases a mist of medicine that is then breathed into the lungs.
The medication in a<unk>  is most commonly a bronchodilator, corticosteroid or a combination of those two. Other medications less commonly used but also administered by<unk>  are mast cell stabilizers, such as (cromoglicate or nedocromil).
Metered-dose inhaler
Nasal spray
Nebulizer
Asthma spacer
Tablet
Inhaler
Ventouse
Activated carbon