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A 60-year-old man developed elevated INR following concomitant administration of warfarin, paracetamol [acetaminophen] and oxycodone [not all dosages and routes stated].
The man was admitted for the sudden onset of severe back pain. He had been taking warfarin 3.5 mg/day for atrial fibrillation and oral tapentadol 100mg daily for pain relief. His prothrombin time-international normalized ratio (PT-INR) was maintained at >2.2. During the current presentation, he was transferred to the palliative care team for pain control. His tapentadol...