azelastine

noun
azel·a·stine | \ ə-ˈze-lə-ˌstēn \

Medical Definition of azelastine 

: an antihistamine drug administered in the form of its hydrochloride C22H24ClN3O·HCl as a nasal spray to treat rhinitis and as eye drops to treat itching associated with allergic conjunctivitis Azelastine may cause a transient bitter or metallic taste even when administered intranasally. —F. Estelle R. Simons and Keith J. Simons, The New England Journal of Medicine,, 9 June 1994

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