The metered dose inhaler (MDI) is the most common device people
use to take asthma medication. An MDI allows you to inhale a
specific amount of medicine (a "metered dose"). It consists of a
metal canister, which keeps the medication under pressure, and a
plastic sleeve, which helps to release the medication. When you
press the canister, medicine particles are propelled toward your
throat where you can inhale them. Proper technique is critical
when using an MDI. If your technique is wrong, too much of the
medicine can end up in your mouth instead of your lungs, and it
will not have enough medicinal effect. Make sure your doctor or
nurse reviews the proper technique with you at every visit,
since it is common for people to get careless with their
technique over time. Check out these instructions for using an
MDI. Even with proper technique, as much as 80% of your dose may
end up in your mouth and throat. For that reason, many doctors
recommend that you rinse your mouth after using an MDI. This
will reduce the b