A 57-year-old man developed spontaneous skin bruising and haematuria d
uring combined therapy with warfarin and indomethacin. Due to the pote
ntial effects of nonsteroidal anti-inflammatory drugs (NSAIDs) on the
anticoagulant action of warfarin and platelet function, patients recei
ving both warfarin and NSAIDs should have their prothrombin time monit
ored very closely. Also, the risk of gastrointestinal haemorrhage with
any NSAIDs must always be remembered.