fexofenadine

noun

fex·​o·​fen·​a·​dine ˌfek-sō-ˈfen-ə-ˌdēn 

variants also fexofenadine hydrochloride

: a nonsedating H₁ antagonist administered orally in the form of its hydrochloride C₃₂H₃₉NO₄·HCl to relieve symptoms of seasonal allergic rhinitis and chronic hives

Note: Fexofenadine is marketed under the trademark Allegra.