Inhalers and nebulizers are two different devices used to
deliver rescue or controller asthma medications directly into
the lungs. Inhalers are portable, handheld devices that are
available in two types: Metered dose inhalers (MDI) are the most
commonly prescribed. Like mini-aerosol cans, these devices push
out a pre-measured spray of medicine. When the person squeezes
the inhaler, a measured "puff" of medicine is released. Some
MDIs have counters that indicate how many doses remain. If
there's no counter, the number of doses already used should be
tracked, so that the inhaler can be replaced on time. Dry powder
inhalers deliver medicine in powder form, but it doesn't spray
out. The user must do more of the work, by inhaling the powdered
medicine quickly and quite forcefully (which is often difficult
for very young kids). Kids who use a metered dose inhaler also
might use a spacer, which attaches to the inhaler and makes it
easier to use. A spacer is a kind of holding chamber for the
medicine, which eliminate