Anticoagulant Antagonists: Reversal Agents for Blood Thinners

Anticoagulant antagonists reverse the effects of blood thinners in bleeding, overdose, or pre-surgery.

Types

1. Vitamin K

Reverses warfarin (vitamin K antagonist) by restoring clotting factor synthesis (II, VII, IX, X). High-dose IV/oral.

2. DOAC-Specific Antidotes

• Idarucizumab (Praxbind) – reverses dabigatran (direct thrombin inhibitor).
• Andexanet alfa (Andexxa) – reverses apixaban & rivaroxaban (factor Xa inhibitors).
• Ciraparantag (Perfact) – reverses edoxaban (factor Xa inhibitor).

Mechanism & Use

Antidotes bind and neutralize the anticoagulant, restoring clotting. Administered under strict medical supervision due to bleeding/thrombosis risks.