Use of 5-fluorocytosine in patients with impaired renal function.

The plasma level and elimination of 5-fluorocytosine (5-FC) was measured in normal subjects and patients with impaired renal function. Prolongation of the half-life of the drug in renal failure has been confirmed. Renal clearance of 5-FC was about 75% of the creatinine clearance and a corresponding modification of drug dosage should be made in patients with renal insufficiency.