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Asthma can be managed with the use of an inhaler which contains a steroid medicine. The medicine is administered into the lungs, and this can help to reduce the inflammation and widen the airways again, for effective gaseous exchange. Inhalers can also contain a β2-agonist which can help to relax the muscles in bronchial walls.
More information on asthma medicines can be found in the breathing and asthma resource.