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Brand Name: Coumadin, Jantoven
Classification: Vitamin K Antagonist (VKA)
Available Forms: Tablet (oral)
Action: Inhibits the synthesis of vitamin K-dependent clotting factors (II, VII, IX, X) in the liver, thereby preventing blood clot formation.
Notes: Warfarin requires close monitoring of the international normalized ratio (INR) to ensure therapeutic anticoagulation. It has numerous drug and food interactions, and its effects can be reversed with vitamin K.