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cetirizine

ce·tir·i·zine

noun \se-ˈtir-ə-ˌzēn\

: an H₁ antagonist administered orally in the form of its dihydrochloride C₂₁H₂₅ClN₂O₃·2HCl to treat allergic rhinitis and chronic hives—see zyrtec

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