Tolerability, pharmacokinetics, and pharmacodynamics of DX-9065a, a new synthetic potent anticoagulant and specific factor Xa inhibitor, in healthy male volunteers

Objective: The aim of this study was to assess the tolerability, pharmacoki netic and pharmacodynamic properties of DX-9065a, a novel low-molecule spec ific factor Xa inhibitor in healthy male volunteers. Methods: DX-9065a was intravenously administered to healthy male Japanese v olunteers at doses of 0.625 to 30 mg, The drug concentrations in plasma and urine were measured and pharmacokinetic parameters were calculated. Coagul ation time and bleeding time were also measured. Results: No serious adverse event was observed during or after administrati on of DX-9065a, The pharmacokinetics of DX-9065a in human subjects after in travenous dosing was linear. The simulated plasma concentrations of DX-9065 were well in accordance with the observed values. Though prolongation of c oagulation times was dependent on plasma concentration of DX-9065, bleeding time did not increase even at the highest plasma concentration of 1640 ng/ mL, Conclusions: DX-9065a had a good correlation between linear pharmacokinetic s and pharmacodynamics after intravenous administration in humans.