TY - JOUR T1 - Two cases of retroperitoneal haematoma caused by interaction between antibiotics and warfarin JF - Emergency Medicine Journal JO - Emerg Med J SP - e08 LP - e08 DO - 10.1136/emj.2004.016345 VL - 23 IS - 1 AU - S Phillips AU - A Barr AU - E Wilson AU - T A Rockall AU - J F Stebbing Y1 - 2006/01/01 UR - http://emj.bmj.com/content/23/1/e08.abstract N2 - 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. ER -