The combination of warfarin and aspirin significantly increases the risk of bleeding due to their additive effects on hemostasis.
Frequent INR monitoring is essential when starting or adjusting doses.
Contraindicated in patients with history of GI ulcers or recent stroke.
Educate patients on bleeding precautions and immediate reporting of symptoms like black stools or unusual bruising.
Gastroprotective agents (e.g., PPIs) may be considered for GI risk mitigation.
Warfarin is a vitamin K antagonist that inhibits the synthesis of clotting factors II, VII, IX, and X, while aspirin irreversibly inhibits platelet aggregation by blocking cyclooxygenase-1 (COX-1). This dual inhibition of coagulation and platelet function potentiates the anticoagulant effect, leading to prolonged bleeding times.
Heightened risk of major bleeding events, including gastrointestinal hemorrhage, intracranial bleeding, epistaxis, and ecchymosis; may result in severe morbidity or mortality in vulnerable patients.
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