By: Kevin Lin, PharmD Candidate c/o 2015 – This April, the FDA approved three sublingual immunotherapies for pollen induced allergic rhinitis: Grastek® (Timothy Grass Pollen Allergen Extract), Oralair® (Grass Pollen Allergen Extract), and Ragwitek® (Short Ragweed Pollen Allergen Extract). Formulated by Merck, Grastek® is Timothy grass pollen allergen extract. It is approved for patients ages…