I think you may be referring to Bacillus coagulans, which is a spore forming, gram positive bacterium. I don't believe Warfarin will have much an effect on the bacteria but it is possible. Warfarin was used as a pesticide, mainly for rats though. I believe that it may not have an effect on bacteria, mainly because its structure is designed to inhibit the enzyme Vitamin K epoxide reductase. Vitamin K epoxide reductase would most likely not be found in bacteria.

Reversal can be achieved by stopping warfarin or administration of vitamin K, fresh frozen plasma or coagulation factor concentrates such as prothrombin complex concentrate (PCC). Complete reversal of anticoagulation may be life-saving. Fresh frozen plasma (FFP) and vitamin K are most frequently administered. However, there are surprisingly few studies defining the optimum dose of these products and there are no randomized studies comparing the relative benefit and risk of coagulation factor concentrates versus fresh frozen plasma.

An arene epoxide is epoxide formally derived from an arene by the addition of an oxygen atom to a double bond.

Vitamin K.

vitamin k