Inhalers are the primary method of delivery for medications used to treat asthma and chronic obstructive pulmonary disease (COPD). However, they can only be effective if they are used properly. Using your inhaler correctly delivers the medication to your lungs, where it can work to control your symptoms. Using an inhaler incorrectly means that little or no medicine reaches the lungs. Click the appropriate link below for instructions on how to use your inhaler.