WebMD
Web Md: Drug Combination for Allergy Symptoms
Resource provides information about the drugs leukotriene modifiers and if they help relieve allergies when used with or without antihistamine medications. A short, but interesting article on the subject.
Other
American Academy of Allergy, Asthma and Immunology
This resource describes an organization that is involved in studies and treatments of allergies. Research and education are also important parts of this organization.