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Amoxicillin/clavulanic acid-warfarin drug interaction: a randomized controlled trial
Qian Zhang1, Guy Simoneau, Celine Verstuyft
1University of Paris VII-Denis Diderot, Therapeutic Research Unit, Department of Internal Medicine, Lariboisière Hospital, Paris, France.
Aims:
To investigate whether an interaction exists between amoxicillin/clavulanic acid (amoxiclav) and warfarin in patients treated with stable oral anticoagulant therapy.
Methods:
In a double-blind, cross-over, placebo-controlled study, 12 patients on stable warfarin therapy, received a 7 day amoxiclav regimen or placebo.
Results:
The mean maximum increase in INR observed was 0.22 ± 0.3 with amoxiclav vs. 0.24 ± 0.6 with placebo (P=0.94). The day 7-day 1 factor II, R(-) and S(-) warfarin plasma concentrations were similar during the amoxiclav and placebo study periods (P=0.81, P=0.45, P=0.75, respectively).
Conclusion:
Amoxiclav did not modify anticoagulation in patients treated with stable warfarin therapy and without infection.
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