The influence of smoking status on the pharmacokinetics and pharmacodynamics of clopidogrel and prasugrel: The paradox study

Paul A. Gurbel, Kevin P. Bliden, Douglas K. Logan, Dean J. Kereiakes, Kenneth C. Lasseter, Alex White, Dominick J. Angiolillo, Thomas D. Nolin, Jen Fue Maa, William L. Bailey, Joseph A. Jakubowski, Clement K. Ojeh, Young Hoon Jeong, Udaya S. Tantry, Brian A. Baker

Research output: Contribution to journalArticlepeer-review

103 Scopus citations


Objectives The goal of this study was to evaluate the effect of smoking on the pharmacokinetics and pharmacodynamics (PD) of clopidogrel and prasugrel therapy. Background Major randomized trial data demonstrated that nonsmokers experience less or no benefit from clopidogrel treatment compared with smokers (i.e., the "smokers' paradox"). Methods PARADOX was a prospective, randomized, double-blind, double-dummy, placebo-controlled, crossover study of objectively assessed nonsmokers (n = 56) and smokers (n = 54) with stable coronary artery disease receiving aspirin therapy. Patients were randomized to receive clopidogrel (75 mg daily) or prasugrel (10 mg daily) for 10 days and crossed over after a 14-day washout. PD was assessed by using VerifyNow P2Y 12 and vasodilator-stimulated phosphoprotein phosphorylation assays. Clopidogrel and prasugrel metabolite levels, cytochrome P450 1A2 activity, CYP2C19 genotype, and safety parameters were determined. Results During clopidogrel therapy, device-reported inhibition of platelet aggregation (IPA) trended lower in nonsmokers than smokers (least squares mean treatment difference ± SE: 7.7 ± 4.1%; p = 0.062). Device-reported IPA was significantly lower in clopidogrel-treated smokers than prasugrel-treated smokers (least squares mean treatment difference: 31.8 ± 3.4%; p < 0.0001). During clopidogrel therapy, calculated IPA was lower and P2Y 12 reaction units and vasodilator-stimulated phosphoprotein phosphorylation and platelet reactivity index were higher in nonsmokers than in smokers (p = 0.043, p = 0.005, and p = 0.042, respectively). Greater antiplatelet effects were present after prasugrel treatment regardless of smoking status (p < 0.001 for all comparisons). Conclusions PARADOX demonstrated lower clopidogrel active metabolite exposure and PD effects of clopidogrel in nonsmokers relative to smokers. Prasugrel was associated with greater active metabolite exposure and PD effects than clopidogrel regardless of smoking status. The poorer antiplatelet response in clopidogrel-treated nonsmokers may provide an explanation for the smokers' paradox. (The Influence of Smoking Status on Prasugrel and Clopidogrel Treated Subjects Taking Aspirin and Having Stable Coronary Artery Disease; NCT01260584).

Original languageEnglish (US)
Pages (from-to)505-512
Number of pages8
JournalJournal of the American College of Cardiology
Issue number6
StatePublished - Aug 6 2013
Externally publishedYes


  • CYP1A2
  • CYP2C19
  • clopidogrel
  • pharmacodynamics
  • pharmacokinetics
  • platelet
  • prasugrel
  • smoking

ASJC Scopus subject areas

  • Cardiology and Cardiovascular Medicine


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