Studies on the antithrombotic action of BOC-D-PHE-PRO-ARG-H (GYKI 14,451)

Gyki 14,451, a peptide antagonist of thrombin, was tested on an in vivo model of venous thrombosis in the rat. At the 4 and 6 mg/kg i.v. doses, the compound caused a reduction of over 80% in the incidence of thrombus formation, also markedly reducing thrombus weight. Oral administration of Gyki 14,451 (50 and 50+50 mg/kg) did not induce a significant reduction either of thrombosis incidence or of thrombus weight.