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“Street” supplies of the anticoagulant drug warfarin: a worrying new trend
  1. D J Dawson1,
  2. L Peters2
  1. 1Manchester Royal Infirmary, Manchester, UK
  2. 2Manchester Drug Service, Bolton, Salford and Trafford Mental Health Trust, Prestwich, Manchester, UK
  1. Correspondence to:
 Debbie Dawson
 Emergency Department, Manchester Royal Infirmary, Oxford Road, Manchester M13 9WL, UK; debbie.dawson{at}

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Increasingly, physicians in emergency departments are seeing cases of injecting drug users (IDU) with dangerously high International Normalized Ratio (INR) results. Some of these patients have admitted to buying warfarin from a “street” source and taking the medication without INR monitoring. This group are known to be at significant risk of developing venous thrombo-embolic disease1 and have difficulties in …

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