An antithrombotic agent is a drug that reduces the formation of blood clots (thrombi).^[1][2] Antithrombotics can be used therapeutically for prevention (primary prevention, secondary prevention) or treatment of a dangerous blood clot (acute thrombus). In the U.S., the American College of Chest Physicians publishes clinical guidelines for clinicians for the use of these drugs to treat and prevent a variety of diseases.^{[citation needed]}

Different antithrombotics affect different blood clotting processes:

• Antiplatelet drugs limit the migration or aggregation of platelets.
• Anticoagulants limit the ability of the blood to clot.
• Thrombolytic drugs act to dissolve clots after they have formed.

• Direct Xa inhibitor
• Warfarin

• Antithrombotic Therapy / American Society of Hematology

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