Abstract: A method and device for treating nasal cavity irritation, such as symptoms of allergic rhinitis. The device includes a nasal suppository having a plug shape for placement within a nasal cavity. In an embodiment, the suppository is frozen saline solution in a therapeutic concentration. In another embodiment, the device includes a handle, frozen within a portion of the suppository and extending therefrom, to allow grasping and insertion of the suppository in an affected nasal cavity. In yet another embodiment, a leak-resistant molding package having a chamber for accepting a liquid and shaped to conform to the interior of a nasal passage, is provided. The method includes inserting an elongated, conformally shaped plug of a frozen liquid into a nasal cavity; removably lodging the frozen liquid in the nasal cavity, and allowing the frozen liquid to gradually melt within the nasal cavity.