NXY-059 Does Not Affect Bleeding Time in Healthy Volunteers: A Randomized, Double-Blind, Placebo-Controlled, 3-Period Crossover Phase I Study Academic Article uri icon

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  • NXY-059 is a novel free radical-trapping neuroprotectant that reduces infarct size and preserves brain function in animal models of acute ischemic stroke. It is the first neuroprotectant to demonstrate a reduction in global disability in a phase III clinical trial, as measured by the modified Rankin Scale. Any effect of NXY-059 on hemostasis may be important when treating stroke patients. This phase I randomized, double-blind, placebo-controlled, 3-period crossover study compared the effect of NXY-059, desmopressin, and placebo on bleeding time, platelet aggregation, and adhesion in 30 healthy volunteers. NXY-059 did not prolong bleeding time compared with placebo: mean (SD) time for NXY-059, 369.5 seconds (125.0 seconds) versus placebo, 369.1 seconds (136.0 seconds). There were no significant effects on platelet aggregation or adhesion. At a mean unbound plasma concentration (Cu(ss)) of 335 micromol/L, NXY-059 was well tolerated, with no major safety concerns identified. In conclusion, NXY-059 does not appear to affect primary hemostasis.


  • Nilsson, Dag
  • Wemer, Johan
  • Cheng, Yi-Fang
  • Reinholdsson, Ingalill
  • Englund, Gunnar
  • Egberg, Nils
  • Schulman, Sam

publication date

  • February 2007