Dry powder inhalers do not use a commercial propellant to eject the medication out of the inhaler; instead the medication is released by taking a deep breath- much faster than one would with a traditional metered dose inhaler. Many people find the dry powders inhalers are a lot easier to use mainly because one does not require hand and inspiration coordination to get the therapeutic dose of the bronchodilator.
There are several designs of dry powder inhalers, which include a dry powder tube inhaler, powder disc inhaler and a single dose dry powder disc inhaler. Dry powder inhalers are never used in combination with a spacer. The one minor negative about these inhalers is that they can be difficult to use during an acute asthmatic attack, because it does require one to take a deep breath. And this can be very difficult in a person who is having an acute asthmatic attack.
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