Which statement best describes the mechanism of action of dabigatran?

Which statement best describes the mechanism of action of dabigatran?

• A. Directly binds to thrombin (Factor IIa)
• B. Inhibits Factor Xa
• C. Inhibits vitamin K epoxide reductase
• D. Increases platelet aggregation

Answer: (A)

Dabigatran works as a direct thrombin inhibitor. It binds to thrombin (Factor IIa) at its active site, preventing thrombin from converting fibrinogen to fibrin and from activating platelets. By blocking thrombin activity, it reduces clot formation and thrombin-mediated amplification of coagulation. Dabigatran is given as a prodrug (dabigatran etexilate) that is converted in the body to the active form. It is not a Factor Xa inhibitor (that role belongs to drugs like rivaroxaban, apixaban, or edoxaban), and it does not inhibit vitamin K–dependent recycling (that's warfarin). It also does not increase platelet aggregation; inhibiting thrombin decreases thrombin-driven platelet activation. For reversal, a specific antidote, idarucizumab, can be used if needed.

Dabigatran works as a direct thrombin inhibitor. It binds to thrombin (Factor IIa) at its active site, preventing thrombin from converting fibrinogen to fibrin and from activating platelets. By blocking thrombin activity, it reduces clot formation and thrombin-mediated amplification of coagulation. Dabigatran is given as a prodrug (dabigatran etexilate) that is converted in the body to the active form. It is not a Factor Xa inhibitor (that role belongs to drugs like rivaroxaban, apixaban, or edoxaban), and it does not inhibit vitamin K–dependent recycling (that's warfarin). It also does not increase platelet aggregation; inhibiting thrombin decreases thrombin-driven platelet activation. For reversal, a specific antidote, idarucizumab, can be used if needed.