A comparison of the izopropylthiobarbiturate (14C-I) and izopropylthiobarbituric acid (14C-II) distribution in rat’s organism has been studied. We show a significant difference in the kinetic schemes of the pharmacokinetics 14C-I and its main metabolite. The distribution processes of the substance 14C-I, unlike its metabolites was characterized by high absorption rate to the organs and tissues.
In comparison with the 14C-I, izopropylthiobarbituric acid has a higher affinity to organs and tissues, except for the brain. Comparative analysis of the MRT demonstrated the analogous values for all organs and tissues of the experimental animals. A characteristic peculiarity of the distribution is a significant influence of the blood-brain barrier on the parameters of the xenobiotic mass transfer between blood and brain.