Definition / meaning of ethynyluracil

An orally-active fluoropyrimidine analogue. Ethynyluracil inhibits dihydropyrimidine dehydrogenase, the rate-limiting enzyme that catabolizes and inactivates 5-fluorouracil (5-FU) in the liver. Co-administration of ethynyluracil permits the oral administration of 5-FU.

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