olopatadine

noun
olo·pat·a·dine | \ ˌō-lō-ˈpat-ə-ˌdēn \

Medical Definition of olopatadine 

: an antihistamine administered in the form of its hydrochloride C21H23NO3·HCl as eye drops for the treatment of itching associated with allergic conjunctivitis

Note: Olopatadine is marketed under the trademarks Pataday and Patanol.

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occurring twice a year or every two years

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