NCIt definition : A combination tablet of ethynyluracil and fluorouracil. Fluorouracil is an antimetabolite
fluoropyrimidine analog of the nucleoside pyrimidine with antineoplastic activity.
Ethynyluracil is an orally-active fluoropyrimidine analog that inhibits dihydropyrimidine
dehydrogenase, the rate-limiting enzyme that catabolizes and inactivates 5-fluorouracil
in the liver. This may lead to an increase in the bioavailability and, effectiveness
of fluorouracil.;