Allergic rhinitis.

Allergic rhinitis is common malady with a significant impact on quality of life. It can affect 25% to 35% of people, depending on the population studied. Costs for physicians' visits and medications, and indirect costs of missed school and work and lost productivity, are estimated to be $2 billion annually in the United States. Pharmacotherapy is the most used therapeutic modality. Topical corticosteroids are the preferred method of treatment for seasonal and perennial allergic rhinitis. Antihistamines and antileukotrienes may be beneficial add-ons to topical steroids. Allergen avoidance is recommended, but may be difficult. Allergen immunotherapy is effective and should be considered with poor response to pharmacotherapy and avoidance.