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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Warfarin and amoxicillin/clavulanate drug interaction.

OBJECTIVE: To report a case of warfarin-amoxicillin/clavulanate potassium (AM/CL) interaction resulting in an elevated international normalized ratio (INR) and hematuria. CASE SUMMARY: A 58-year-old Hawaiian/Asian/European woman developed an elevated INR and microscopic hematuria as a result of a drug-drug interaction between warfarin and AM/CL. DISCUSSION: Our report of an increased INR with bleeding complications as a result of an interaction between warfarin and AM/CL is consistent with those in the literature. Although the mechanism for this interaction is not fully known, it is suspected that a decrease in vitamin K-producing gut flora with resulting vitamin K deficiency would be the most likely contributing factor. An objective causality assessment revealed that this adverse drug event as a result of the warfarin and AM/CL interaction was possible. CONCLUSIONS: An increased INR secondary to warfarin interactions with various antibacterial agents is a known phenomenon. An increased awareness of warfarin-AM/CL interaction and appropriate monitoring are essential to control the INR levels and prevent bleeding complications.[1]


  1. Warfarin and amoxicillin/clavulanate drug interaction. Davydov, L., Yermolnik, M., Cuni, L.J. The Annals of pharmacotherapy. (2003) [Pubmed]
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