Increased prothrombin times induced by combined vitamin E and warfarin therapy may be managed by discontinuing vitamin E, and, if necessary, by administering vitamin K.

Cerebral venous thrombosis is a rare but potentially life-threatening condition that is particularly prevalent in young women (ie, mean age 44 years) and accounts for 0·5–3% of all strokes. The ...

Kuykendall et al. [10] reported an inverse effect on INRs when a patient used smokeless tobacco while taking warfarin 25-30 mg/day. The vitamin K in tobacco might have been the cause of ...