%0 Journal Article %A S Phillips %A A Barr %A E Wilson %A T A Rockall %A J F Stebbing %T Two cases of retroperitoneal haematoma caused by interaction between antibiotics and warfarin %D 2006 %R 10.1136/emj.2004.016345 %J Emergency Medicine Journal %P e08-e08 %V 23 %N 1 %X Several commonly prescribed antibiotics are known to interact with warfarin, increasing its anticoagulant effect by different mechanisms. Retroperitoneal bleeding with consequent haematoma is recognised as a complication of over-anticoagulation. Consequences, which are potentially fatal, include hypovolaemic shock and compression of retroperitoneal structures such as the ureter and inferior vena cava. %U https://emj.bmj.com/content/emermed/23/1/e08.full.pdf