Pharmacokinetics of Damvar.

The pharmacokinetics of granulated Damvar (delta-(2-amino-6-hydroxy-3,4-dihydro-4-oxo-5-pyrimidinyl) valeric acid) after a single oral dose of 1000 mg was studied in 10 subjects with neoplastic disease. The rate of Damvar absorption from the digestive tract is not very fast. Maximal serum levels (13.5 micrograms/ml) were recorded 3 h after administration with minor interpersonal variations. The time course of Damvar serum concentrations coincides with its distribution in a two-compartmental pharmacokinetic model with biological half-life of 9.72 +/- 0.84 h. Only a small amount of Damvar is eliminated in urine during a period of 24 h (3.1% of the administered dose). Its renal clearance is also low (0.05 ml/s). The analysis of Damvar excretion in urine shows that kidneys play a minor role in its elimination from the body. Therefore the attention should be concentrated on the effect of Damvar administration in patients with disturbed metabolic functions.