TY - JOUR T1 - Warfarin interaction with <em>Matricaria chamomilla</em> JF - Canadian Medical Association Journal JO - CMAJ SP - 1281 LP - 1282 DO - 10.1503/cmaj.051191 VL - 174 IS - 9 AU - Robert Segal AU - Louise Pilote Y1 - 2006/04/25 UR - http://www.cmaj.ca/content/174/9/1281.abstract N2 - No cases have been reported of Matricaria chamomilla potentiating the effects of warfarin. Nevertheless there is a theoretical risk for potentiation, since the herb is thought to be a coumarin constituent. We describe the case of a 70-year-old woman who, while being treated with warfarin, was admitted to hospital with multiple internal hemorrhages after having used chamomile products (tea and body lotion) to soothe upper respiratory tract symptoms. Patient education on the potential risk of taking chamomile products while being treated with warfarin is necessary to avoid such occurrences. ER -