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Abstract The purpose of this study was to evaluate the safety, pharmacokinetics (PK), and pharmacodynamics (PD) of frunexian (formerly known as EP‐7041 and HSK36273) injection, a small molecule inhibitor of activated coagulation factor XI (FXIa), in healthy Chinese adult volunteers. This study was a randomized, placebo‐ and positive‐controlled, sequential, ascending‐dose (0.3/0.6/1.0/1.5/2.25 mg/kg/h) study of 5‐day continuous intravenous infusions of frunexian. Frunexian administration exhibited an acceptable safety profile with no bleeding events. Steady state was rapidly reached with a median time ranging from 1.02 to 1.50 h. The mean half‐life ranged from 1.15 to 1.43 h. Frunexian plasma concentration at a steady state and area under the concentration–time curve exhibited dose‐proportional increases. The dose‐escalation study of frunexian demonstrated its progressively enhanced capacities to prolong activated partial thromboplastin time (aPTT) and inhibit FXIa activity. The correlations between PK and PD biomarkers (aPTT/baseline and FXI clotting activity/baseline) were described by the two E max models, with the EC 50 values of 8940 and 1300 ng/mL, respectively. Frunexian exhibits good safety and PK/PD properties, suggesting it is a promising candidate for anticoagulant drug.
Zhang et al. (Mon,) studied this question.