loratadine

noun

lo·​rat·​a·​dine lə-ˈrat-ə-ˌdēn  -ˌdīn 

: a long-acting, nonsedating antihistamine drug C₂₂H₂₃ClN₂O₂ taken orally to relieve the symptoms of seasonal allergic rhinitis and chronic urticaria

Note: Loratadine is an H₁ antagonist that binds competitively with histamine to H₁ receptors on cell membranes. It is marketed under the trademark Claritin.