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Circulation. 2003;107:32-37
Published online before print November 25, 2002, doi: 10.1161/01.CIR.0000047060.60595.CC
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(Circulation. 2003;107:32.)
© 2003 American Heart Association, Inc.


Clinical Investigation and Reports

Atorvastatin Reduces the Ability of Clopidogrel to Inhibit Platelet Aggregation

A New Drug–Drug Interaction

Wei C. Lau, MD; Lucy A. Waskell, MD, PhD; Paul B. Watkins, MD; Charlene J. Neer, BSN, MPA; Kevin Horowitz, BS; Amy S. Hopp, BS; Alan R. Tait, PhD; David G.M. Carville, PhD; Kirk E. Guyer, BS; Eric R. Bates, MD

From the Department of Anesthesiology (W.C.L., L.A.W., C.J.N., K.H., A.S.H., A.R.T.) and Division of Cardiology, Department of Internal Medicine (E.R.B.), University of Michigan, Ann Arbor; General Clinical Research Center, University of North Carolina at Chapel Hill (P.B.W.); Division of Thrombosis, Department of Chemistry, Indiana University South Bend (D.G.M.C., K.E.G.); and Department of Anesthesiology, VA Medical Center, Ann Arbor, Mich (L.A.W.).

Correspondence to Wei C. Lau, MD, Department of Anesthesiology, University of Michigan Health System, 1500 East Medical Center Dr, 1G323 University Hospital, Box 0048, Ann Arbor, MI 48109-0048. E-mail weiclau{at}umich.edu

Background— We observed that the prodrug clopidogrel was less effective in inhibiting platelet aggregation with coadministration of atorvastatin during point-of-care platelet function testing. Because atorvastatin is metabolized by cytochrome P450 (CYP) 3A4, we hypothesized that clopidogrel might be activated by CYP3A4.

Methods and Results— Platelet aggregation was measured in 44 patients undergoing coronary artery stent implantation treated with clopidogrel or clopidogrel plus pravastatin or atorvastatin, and in 27 volunteers treated with clopidogrel and either erythromycin or troleandomycin, CYP3A4 inhibitors, or rifampin, a CYP3A4 inducer. Atorvastatin, but not pravastatin, attenuated the antiplatelet activity of clopidogrel in a dose-dependent manner. Percent platelet aggregation was 34±23, 58±15 (P=0.027), 74±10 (P=0.002), and 89±7 (P=0.001) in the presence of clopidogrel and 0, 10, 20, and 40 mg of atorvastatin, respectively. Erythromycin attenuated platelet aggregation inhibition (55±12 versus 42±12% platelet aggregation; P=0.002), as did troleandomycin (78±18 versus 45±18% platelet aggregation; P<0.0003), whereas rifampin enhanced platelet aggregation inhibition (33±18 versus 56±20% platelet aggregation, P=0.001).

Conclusions— CYP3A4 activates clopidogrel. Atorvastatin, another CYP3A4 substrate, competitively inhibits this activation. Use of a statin not metabolized by CYP3A4 and point-of-care platelet function testing may be warranted in patients treated with clopidogrel.


Key Words: drugs • pharmacology • platelets • statins




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D. Williams, I. Ford, G. Hawksworth, J. V. Mitsios, A. I. Papathanasiou, F. I. Rodis, M. Elisaf, J. A. Goudevenos, and A. D. Tselepis
Potential Statin-Clopidogrel Interaction Requires More Study * Response
Circulation, August 10, 2004; 110(6): e68 - e68.
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J Am Coll CardiolHome page
M. L. Stadius
Diminishing returns ...and too many choices ...the saga of pharmacologic therapy to reduce the complications of percutaneous coronary intervention
J. Am. Coll. Cardiol., July 7, 2004; 44(1): 25 - 27.
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CirculationHome page
S. D. Wiviott and E. M. Antman
Clopidogrel Resistance: A New Chapter in a Fast-Moving Story
Circulation, June 29, 2004; 109(25): 3064 - 3067.
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CirculationHome page
S. Bellosta, R. Paoletti, and A. Corsini
Safety of Statins: Focus on Clinical Pharmacokinetics and Drug Interactions
Circulation, June 15, 2004; 109(23_suppl_1): III-50 - III-57.
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CirculationHome page
A. Chieffo, E. Bonizzoni, D. Orlic, G. Stankovic, R. Rogacka, F. Airoldi, G. W. Mikhail, M. Montorfano, I. Michev, M. Carlino, et al.
Intraprocedural Stent Thrombosis During Implantation of Sirolimus-Eluting Stents
Circulation, June 8, 2004; 109(22): 2732 - 2736.
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J Am Coll CardiolHome page
Z. Xiao and P. Theroux
Clopidogrel inhibits platelet-leukocyte interactions and thrombin receptor agonist peptide-induced platelet activation in patients with an acute coronary syndrome
J. Am. Coll. Cardiol., June 2, 2004; 43(11): 1982 - 1988.
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CirculationHome page
R. A. Hobbs, M. J. Tafreshi, J. Saw, D. Brennan, E. J. Topol, S. R. Steinhubl, P. B. Berger, D. J. Kereiakes, and V. L. Serebruany
Clopidogrel-Atorvastatin Interaction * Response
Circulation, May 25, 2004; 109(20): e230 - e230.
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CirculationHome page
J. V. Mitsios, A. I. Papathanasiou, F. I. Rodis, M. Elisaf, J. A. Goudevenos, and A. D. Tselepis
Atorvastatin Does Not Affect the Antiplatelet Potency of Clopidogrel When It Is Administered Concomitantly for 5 Weeks in Patients With Acute Coronary Syndromes
Circulation, March 23, 2004; 109(11): 1335 - 1338.
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J Am Coll CardiolHome page
J. P. Curtis and H. M. Krumholz
The case for an adverse interaction between aspirin and non-steroidal anti-inflammatory drugs: Is it time to believe the hype?
J. Am. Coll. Cardiol., March 17, 2004; 43(6): 991 - 993.
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Eur Heart JHome page
A Kastrati, A Schomig, and E Schomig
Are we making efficient use of clopidogrel?
Eur. Heart J., March 2, 2004; 25(6): 454 - 456.
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Eur Heart JHome page
A. Lepantalo, K. S Virtanen, J. Heikkila, U. Wartiovaara, and R. Lassila
Limited early antiplatelet effect of 300 mg clopidogrel in patients with aspirin therapy undergoing percutaneous coronary interventions
Eur. Heart J., March 2, 2004; 25(6): 476 - 483.
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Eur Heart JHome page
A Mugge and H Neubauer
Do statins really interfere with clopidogrel-induced platelet function?: Reply
Eur. Heart J., March 1, 2004; 25(5): 449 - 449.
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CirculationHome page
W. C. Lau, P. A. Gurbel, P. B. Watkins, C. J. Neer, A. S. Hopp, D. G.M. Carville, K. E. Guyer, A. R. Tait, and E. R. Bates
Contribution of Hepatic Cytochrome P450 3A4 Metabolic Activity to the Phenomenon of Clopidogrel Resistance
Circulation, January 20, 2004; 109(2): 166 - 171.
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J. Pharmacol. Exp. Ther.Home page
T. Richter, T. E. Murdter, G. Heinkele, J. Pleiss, S. Tatzel, M. Schwab, M. Eichelbaum, and U. M. Zanger
Potent Mechanism-Based Inhibition of Human CYP2B6 by Clopidogrel and Ticlopidine
J. Pharmacol. Exp. Ther., January 1, 2004; 308(1): 189 - 197.
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CirculationHome page
I. Muller, F. Besta, C. Schulz, Z. Li, S. Massberg, and M. Gawaz
Effects of Statins on Platelet Inhibition by a High Loading Dose of Clopidogrel
Circulation, November 4, 2003; 108(18): 2195 - 2197.
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Eur Heart JHome page
E. R Bates, D. Mukherjee, and W. C Lau
Drug-drug interactions involving antiplatelet agents
Eur. Heart J., October 1, 2003; 24(19): 1707 - 1709.
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Eur Heart JHome page
H. Neubauer, B. Gunesdogan, C. Hanefeld, M. Spiecker, and A. Mugge
Lipophilic statins interfere with the inhibitory effects of clopidogrel on platelet function -- a flow cytometry study
Eur. Heart J., October 1, 2003; 24(19): 1744 - 1749.
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StrokeHome page
M. Di Napoli
Editorial Comment--C-Reactive Protein and Vascular Risk in Stroke Patients: Potential Use for the Future
Stroke, October 1, 2003; 34(10): 2468 - 2470.
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CirculationHome page
P. Damkier, V. L. Serebruany, S. R. Steinhubl, and C. H. Hennekens
Atorvastatin and Clopidogrel * Response
Circulation, September 30, 2003; 108 (13): e96 - e96.
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CirculationHome page
A. I. Schafer
Genetic and Acquired Determinants of Individual Variability of Response to Antiplatelet Drugs
Circulation, August 26, 2003; 108(8): 910 - 911.
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CirculationHome page
P. T. Martin, R. Denman, W. C. Lau, L. A. Waskell, C. J. Neer, K. Horowitz, A. S. Hopp, A. R. Tait, E. R. Bates, P. B. Watkins, et al.
Atorvastatin-Clopidogrel Interaction * Response
Circulation, June 24, 2003; 107 (24): e223 - e223.
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CirculationHome page
M. Shechter, W. C. Lau, L. A. Waskell, C. J. Neer, K. Horowitz, A. S. Hopp, A. R. Tait, E. R. Bates, P. B. Watkins, D. G.M. Carville, et al.
Atorvastatin and the Ability of Clopidogrel to Inhibit Platelet Aggregation * Response
Circulation, June 10, 2003; 107 (22): e210 - e210.
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Nephrol Dial TransplantHome page
W. Koenig
C-reactive protein and cardiovascular risk: an update on what is going on in cardiology
Nephrol. Dial. Transplant., June 1, 2003; 18(6): 1039 - 1041.
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CirculationHome page
V. L. Serebruany, S. R. Steinhubl, and C. H. Hennekens
Are Antiplatelet Effects of Clopidogrel Inhibited by Atorvastatin?: A Research Question Formulated but Not Yet Adequately Tested
Circulation, April 1, 2003; 107(12): 1568 - 1569.
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Journal Watch CardiologyHome page
Atorvastatin-Clopidogrel Drug Interaction
Journal Watch Cardiology, March 21, 2003; 2003(321): 3 - 3.
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J Am Coll CardiolHome page
C. Mueller, H. Roskamm, F.-J. Neumann, P. Hunziker, S. Marsch, A. Perruchoud, and H. J. Buettner
A randomized comparison of clopidogrel and aspirin versus ticlopidine and aspirin after the placement of coronary artery stents
J. Am. Coll. Cardiol., March 19, 2003; 41(6): 969 - 973.
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