Low-dose ticagrelor yields an antiplatelet efficacy similar to that of standard-dose ticagrelor in healthy subjects: an open-label randomized controlled trial

Sci Rep. 2016 Aug 24;6:31838. doi: 10.1038/srep31838.


Ticagrelor has a greater antiplatelet efficacy than clopidogrel but may be accompanied by an increased risk of bleeding. This study evaluated the antiplatelet effect and pharmacokinetic profile of low-dose ticagrelor in healthy Chinese volunteers. Thirty healthy subjects were randomized to receive standard-dose ticagrelor (180-mg loading dose, 90-mg twice daily [bid] [n = 10]), low-dose ticagrelor (90-mg loading dose, 45-mg bid [n = 10]), or clopidogrel (600-mg loading dose, 75-mg once daily [n = 10]). Platelet reactivity was assessed by using the VerifyNow P2Y12 assay at baseline and 0.5, 1, 2, 4, 8, 24, 48, and 72 hours post-dosing. The ticagrelor and AR-C124910XX concentrations were measured for pharmacokinetic analysis. The percentage inhibition of P2Y12 reaction units was higher in the low-dose and standard-dose ticagrelor group than in the clopidogrel group at 0.5, 1, 2, 4, 8, and 48 hours post-dosing (P < 0.05 for all), but did not differ significantly between the two ticagrelor doses at any time-point (P > 0.05). The plasma ticagrelor and ARC124910XX concentrations were approximately 2-fold higher with standard-dose versus low-dose ticagrelor. No serious adverse events were reported. In conclusion, low-dose ticagrelor achieved faster and higher inhibition of platelet functions in healthy Chinese subjects than did clopidogrel, with an antiplatelet efficacy similar to that of standard-dose ticagrelor.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adenosine / administration & dosage
  • Adenosine / analogs & derivatives*
  • Adenosine / pharmacokinetics
  • Adult
  • China
  • Clopidogrel
  • Dose-Response Relationship, Drug
  • Female
  • Healthy Volunteers
  • Humans
  • Male
  • Platelet Aggregation Inhibitors / administration & dosage*
  • Platelet Aggregation Inhibitors / pharmacokinetics
  • Receptors, Purinergic P2Y12 / metabolism*
  • Ticagrelor
  • Ticlopidine / administration & dosage
  • Ticlopidine / analogs & derivatives*
  • Ticlopidine / pharmacokinetics
  • Young Adult


  • P2RY12 protein, human
  • Platelet Aggregation Inhibitors
  • Receptors, Purinergic P2Y12
  • Clopidogrel
  • Ticagrelor
  • Adenosine
  • Ticlopidine