Pharmacokinetics of dimeric dipeptide mimetic of nerve growth factor GC-2 in rats. Part 1. Single and multiple intravascular and extravascular administration. Testing the hypothesis of linearity of pharmacokinetics

The pharmacokinetics of dimeric dipeptide mimetic of nerve growth factor GC-2 in the rat blood plasma after different routes of administration was studied. The drug was administered at dose of 150 mg/kg by single and repeatedly. After single intravenous and intraperitoneal injection, GC-2 was detected for 2 h, its half-life was 0.4 h. GC-2 absolute bioavailability after single intraperitoneal injection was 84.62 %, that indicates the prospect of development its injectable (intramuscularly) dosage form. After 4-fold (1.5 h dosing interval) intraperitoneal injection dose-independent pharmacokinetic parameters of GC-2 practically do not change compared to single administration. This indicates that GC-2 is not accumulated in the body of rats. The hypothesis of the linearity of the pharmacokinetics of GC-2 in the rats blood plasma after single intraperitoneal administration at doses of 50, 100 and 150 mg/kg was tested. It was found that the kinetics of GC-2 in the rat blood plasma is linea.