There are two types of inhaler: preventers and relievers. Preventer inhalers, such Pulmicort are used daily to control inflammation in the airways, which reduces the risk of an asthma attack occurring. It will not provide relief from an asthma attack.
Reliever inhalers treat asthma attacks and are used only when necessary. Reliever inhalers include Ventolin, Salamol, and Airomir.