The pharmacokinetics of tinidazole after infusion (800 mg in 15 min) were studied in 12 patients with chronic renal failure (RI) and in five patients undergoing regular dialysis treatment (RD). Tinidazole elimination plasma half‐life was 15.09 +/‐ 0.68 h (mean +/‐ s.e. mean) (RI) and 12.9 +/‐ 1.0 h after dialysis (RD), but there was a significant decrease in half‐life during dialysis (4.25 +/‐ 0.43 h) P less than 0.001). The apparent volume of distribution (0.64 +/‐ 0.03 l/kg) was equal to extra and intracellular water volume and tinidazole was little bound to plasma protein (8%). There was a slight sex difference in apparent volume of distribution between male patients (0.70 +/‐ 0.09 l/kg) and female patients (0.59 +/‐ 0.10 l/kg) (P = 0.07), but as body clearance decreases in the same order, there was no modification of plasma half‐life. In renal failure, pharmacokinetics of tinidazole were not disturbed because no correlation between half‐life, body clearance and creatinine clearance occurred; urine elimination was about 7% of administered dose. Plasma clearance during dialysis was 49.9 +/‐ 3.2 ml/min and about 43% of the available drug was eliminated during the 6 h dialysis procedure. These results suggest that an additional half‐dose infusion should be given after the end of dialysis in patients undergoing regular dialysis treatment.

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