Allergic rhinitis is a persistent condition that typically requires ongoing therapy. Allergen avoidance along with pharmacologic therapy with nasal corticosteroids and oral antihistamines are standard management. Allergen immunotherapy is reserved for severe or refractory cases. Sublingual immunotherapy involves the application of the allergen to the sublingual tissue. In the case of Odactra™, Oralair®, Grastek®, and Ragwitek®, the allergen is in a sublingual tablet which is self-administered, after the first dose.

The exact mechanism of sublingual allergen immunotherapy has not been fully elucidated. Allergen extracts given sublingually are primarily taken up by dendritic cells in the mucosa and presented to T cells in the draining lymph nodes. Likely mechanisms of action include activation of T regulatory cells and downregulation of mucosal mast cells. Within the oral and sublingual mucosa, effector cells, such as mast cells, are less numerous, which may account for the lower rates of adverse systemic allergic reactions seen with sublingual immunotherapy.

Timothy grass pollen allergen extract (Grastek®) is indicated as immunotherapy for the treatment of grass pollen-induced allergic rhinitis with or without conjunctivitis confirmed by positive skin test or in vitro testing for pollen-specific IgE antibodies for Timothy grass or cross-reactive grass pollens in persons 5 through 65 years of age.

Short ragweed pollen allergen extract (Ragwitek®) is indicated as immunotherapy for the treatment of short ragweed pollen-induced allergic rhinitis, with or without conjunctivitis, confirmed by positive skin test or in vitro testing for pollen-specific IgE antibodies for short ragweed pollen in individuals 5 through 65 years of age.

Sweet Vernal, Orchard, Perennial Rye, Timothy, and Kentucky Blue Grass mixed pollens allergen extract (Oralair®) is indicated as immunotherapy for the treatment of grass pollen-induced allergic rhinitis with or without conjunctivitis confirmed by positive skin test or in vitro testing for pollen-specific IgE antibodies for any of the five grass species contained in this product in persons 10 through 65 years of age.

Dermatophagoides farinae or Dermatophagoides pteronyssinus house dust mite allergen extract (Odactra™) is indicated as immunotherapy for house dust mite (HDM)-induced allergic rhinitis, with or without conjunctivitis, confirmed by positive in vitro testing for IgE antibodies to Dermatophagoides farinae or Dermatophagoides pteronyssinus house dust mites, or by positive skin testing to licensed house dust mite allergen extracts. Odactra™ is approved for use in individuals12 through 65 years of age.

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