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