GPnotebook - Explanation of the types of asthma medications, designed for clinical use. - http://www.gpnotebook.co.uk/simplepage.cfm?ID=-1818623927
DrugDigest - Offers information on the various drug classes for this condition, including precautions and side effects. - http://www.drugdigest.org/DD/HC/Treatment/0,4047,5,00.html
WebMD: Asthma Medications - Explanation of the different types of medication, including generic and brand names. - http://my.webmd.com/content/article/10/1660_51069?z=1660_51062_6507_00_20