Amoxicillin/clavulanic acid-warfarin drug interaction: a randomized controlled trial. Zhang, Q., Simoneau, G., Verstuyft, C., Drouet, L., dit Sollier, C. B., Alvarez, J., Rizzo-Padoin, N., Bergmann, J. F., Becquemont, L., & Mouly, S. British Journal of Clinical Pharmacology, 71(2):232–236, February, 2011.
Amoxicillin/clavulanic acid-warfarin drug interaction: a randomized controlled trial [link]Paper  doi  abstract   bibtex   
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.
@article{zhang_amoxicillin/clavulanic_2011,
	title = {Amoxicillin/clavulanic acid-warfarin drug interaction: a randomized controlled trial},
	volume = {71},
	issn = {0306-5251},
	shorttitle = {Amoxicillin/clavulanic acid-warfarin drug interaction},
	url = {http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3040543/},
	doi = {10.1111/j.1365-2125.2010.03824.x},
	abstract = {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.},
	number = {2},
	urldate = {2014-06-25TZ},
	journal = {British Journal of Clinical Pharmacology},
	author = {Zhang, Qian and Simoneau, Guy and Verstuyft, Celine and Drouet, Ludovic and dit Sollier, Claire Bal and Alvarez, Jean-Claude and Rizzo-Padoin, Nathalie and Bergmann, Jean Francois and Becquemont, Laurent and Mouly, Stephane},
	month = feb,
	year = {2011},
	pmid = {21219403},
	pmcid = {PMC3040543},
	keywords = {Adult, Aged, Amoxicillin-Potassium Clavulanate Combination, Anti-Bacterial Agents, Anticoagulants, Blood Coagulation, Cross-Over Studies, Double-Blind Method, Drug Interactions, Female, Humans, International Normalized Ratio, Male, Middle Aged, Prothrombin, Warfarin, Young Adult},
	pages = {232--236}
}

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