What is administered to counteract an overdose on Warfarin?

The correct response is Vitamin K, which plays a crucial role in blood clotting and is the antidote for Warfarin overdose. Warfarin is an anticoagulant that works by inhibiting the synthesis of vitamin K-dependent clotting factors in the liver. If someone is experiencing an overdose of Warfarin, their blood coagulation ability is significantly impaired, leading to an increased risk of bleeding.

By administering Vitamin K, you provide the body with the necessary component to restore the production of clotting factors, thus reversing the effects of Warfarin and helping to normalize blood coagulation levels. This is a common and effective treatment strategy to manage excessive anticoagulation in patients.

Other substances listed, like Vitamin C or D, do not play a role in reversing the effects of Warfarin. Calcium, while important in various bodily functions, particularly in the clotting cascade, is not the direct counteractive agent in overdose situations related to Warfarin. Therefore, Vitamin K stands out as the specific antidote necessary for addressing Warfarin overdose effectively.