Probable Warfarin and Dapsone Interaction

Bleeding due to a probable interaction between warfarin and Gouqizi (Lycium Barbarum L.)

Unlike what is widely anticipated by the public, herbal medicines are not always safe despite being natural. We describe a 65-year-old Chinese man taking a prolonged maintenance dose of warfarin who experienced an elevated international normalized ratio (INR) with associated bleeding after drinking Gouqizi (goji berry) wine. This report illustrates that large doses (more than 6-12 g) of Gouqizi...

Interaction of rifampin and warfarin.

A 72-year-old man who had been taking rifampin daily for several months was concurrently administered warfarin daily for ten weeks. During this period, the prothrombin time (PT) rose remarkably little as the dosage of warfarin was increased. With difficulty, satisfactory anticoagulation was achieved by giving warfarin 20 mg daily. On discontinuation of rifampin therapy, the PT increased signifi...

Interaction between warfarin and sulphamethoxazole.

A patient is described in whom there was strong circumstantial evidence of an interaction between warfarin and co-trimaxazole. To test the validity of this hypothesis a series of in vitro and in vivo human studies were untaken. The results indicate that interaction may occur in which the sulphamethoxazole moiety of co-trimoxazole displaces warfarin from its binding sites on plasma albumin. Neve...

Fatal phenytoin warfarin interaction.

Moxifloxacin-warfarin interaction

Two case reports presented here show elevated prothrombin time/international normalized ratios (PT/INR) following coadministration of warfarin and moxifloxacin. Although the underlying mechanism of this interaction still remains unclear, health care providers should be careful when prescribing moxifloxacin to patients on warfarin therapy, especially to patients with low albumin levels. More fre...