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Author: Rachel Beham, PharmD Educational Pearls: Some synthetic cannabinoids have been contaminated with Brodifacoum. Brodifacoum is a Vitamin K antagonist and can present with a severe coagulopathy. Brodifacoum is commonly known as "superwarfarin" and has a very long half life of 120+ days. Check PT/INR in patients with a bleeding diathesis in setting of synthetic cannabinoid use. Treatment is activated charcoal and large doses of Vitamin K (10mg Q6H for months). References: Lipton R.A.; Klass E.M. (1984). "Human ingestion of a 'superwarfarin' rodenticide resulting in a prolonged anticoagulant effect". JAMA . 252: 3004–3005. La Rosa F; Clarke S; Lefkowitz J. B. (1997). "Brodifacoum intoxication with marijuana smoking". Archives of Pathology & Laboratory Medicine . 121: 67–69