Anticoagulant effect of Warfarin is increased by all of the following EXCEPT:: (A) Cimetidine, (B) Phytonadione, (C) Amiodarone, (D) Phenylbutazone
Answer is B. Phytonadione is Vit K. It is used as an antidote in warfarin toxicity. From essential of medical pharmacology K D Tripati 7th edition Page no 613