Leukovir, an enteric-coated tablet, is the original drug product for
internal use. The well-known nucleosides cladribine and ribavirin are the
active ingredients of the drug product leukovir. Pharmacokinetic parameters of
the drug product for the internal use of leukovir active ingredients have been
established. The cladribine half-absorption period was t1/2a = 49.5 h, C0 = 276.4 μg/ml, Cmax = 6.0 μg/ml.
Distribution and accumulation parameters (Vd, Vss and AUC) have
indicated that the drug distribution between the blood cells and blood plasma
takes place in the same way, irrespective of the dosage form. Cladribine
half-life period is t1/2e = 0.62 hours. The molecule total
clearance and average lifetime in the body in the case of subcutaneous drug
administration are approximately the same. Ribavirin is characterized by a
half-absorption period of t1/2a = 0.71 h, C0 = 115.6 μg/ml and Cmax = 75.5 μg/ml. Ribavirin total volume of distribution (V
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