Eniluracil increases the oral bioavailability of 5-FU and results in a switch from hepatic metabolism to renal elimination. A standard dose of this combination can be administered safely to patients with CLCr >50 ml/min. The combination can also be given to patients with renal impairment using a test dose and pharmacokinetic measurements to predict the appropriate dose of 5-FU. It is expected that sufficient information will be available from this and other studies to allow accurate prediction of the appropriate 5-FU dose modifications required in patients with renal impairment.
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