Abstract: Rheumatoid arthritis is a common disease occurring in 1% of the population. Therefore it is not unusual to see a rheumatoid arthritis patient who needs anticoagulation therapy for another reason than her or his RA. Anticoagulation therapy has no contra-indication for RA itself. However many drugs used in RA may interfere with anticoagulant drugs. The major problem arises from NSAIDs, particularly salicylate. These drugs have a synergistic effect on coumadin ...