aprepitant

noun
aprep·i·tant | \ ə-ˈpre-pə-tənt \

Medical Definition of aprepitant 

: an antiemetic drug C23H21F7N4O3 taken orally to prevent nausea and vomiting occurring as a consequence of cancer chemotherapy or surgery

Note: Aprepitant acts as an antagonist of receptors for substance P. It is often taken in combination with other antiemetic drugs and is marketed under the trademark Emend.

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occurring twice a year or every two years

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