Allergic rhinitis is a symptomatic disorder of the nose secondary to IgE-mediated inflammation of the nasal membranes induced after exposure to allergens.
Major symptoms include nasal itching, watery rhinorrhea, nasal obstruction/congestion, sneezing and postnasal drainage.
Other symptoms include headache, conjunctival symptoms, eye pruritus, impaired smell and morning cough.
Symptoms can reverse spontaneously with or without treatment.
The prevalence of allergic diseases in the Asia-Pacific region is expected to rise over the next 20 years, driven by rapid economic development and urbanization. Allergic diseases have high socioeconomic impact by impairing productivity and quality of life, and the impact may be greater in Asia-Pacific than in Europe due to the presence and predominance of perennial allergens.
The fixed-dose combination of montelukast plus levocetirizine produces greater improvements in allergic rhinitis symptoms as compared with montelukast alone in patients with concurrent mild-to-moderate asthma, according to the results of a phase III trial. Moreover, the combination is well tolerated with an acceptable safety profile.
Transdermal administration of emedastine difumarate provides effective control of symptoms of seasonal allergic rhinitis, with the effects sustained throughout the day and raising no safety signals of clinical concern, according to the results of a phase III trial.
The presence of eczema or atopic dermatitis with concurrent allergic sensitization at 1 year of age was associated with an increased risk of developing asthma and food allergy in later childhood at 3 years old, according to the CHILD* study.
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