Pharmacokinetics of cyclophosphamide in man

1. The pharmacokinetics of cyclophosphamide were investigated in cancer patients. The data can be characterized by a two-compartment open model. The half life of the elimination phase of the drug ranged between 3 and 11 hours.2. Extensive tubular reabsorption of the drug resulted in the excretion of only a small percentage of the administered dose. The mean renal clearance was 10.7 ml/minute.3. The calculated fraction of the dose of drug which was metabolized averaged 88%.