A 78-Year-Old Man Is Found Unresponsive and Is Brought by Ambulance

A 78-year-old man is found unresponsive and is brought by ambulance to the emergency department.  Upon arrival, the family says he has a complicated medical history and takes multiple medications but has no known drug allergies.  Noncontrast CT scan of the head reveals intracranial hemorrhage.  The patient is given a recombinant biologic agent that has antigen homology with factor Xa but no catalytic effect.  The agent is most likely to antagonize the effects of which of the following drugs?

A) Apixaban
B) Aspirin
C) Dabigatran
D) Ticagrelor
E) Warfarin

Correct Answer:

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