How does it work? of Bronchodilator drugs

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Bronchodilators are inhaled directly into the lungs using:

Inhalers (puffers) - plastic devices that release a small dose of the required drug when inhaled. Can be used whenever necessary to relieve an attack, or on a regular basis to prevent an attack occurring. Usually improves breathing after a few minutes. Some people take an extra dose before activity that is likely to cause breathlessness (eg exercise) to prevent an attack. Inhaled corticosteroids are usually effective in a few days and often reduce the frequency of attacks.
Insufflation cartridges - deliver a larger dose than inhalers, and
Nebulizers - deliver the largest dose and rapid relief. A mixture of compressed air and the drug is given using a face mask