DrugDigest: Offers information on the various drug classes for this condition, including precautions and side effects.
GPnotebook: Explanation of the types of asthma medications, designed for clinical use.
MayoClinic: Medications And Immunotherapy For Asthma: Descriptions of a variety of medications.
WebMD: Asthma Medications: Explanation of the different types of medication, including generic and brand names.