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what is it about asprin that makes it so good at thinning the blood?
Low-dose, long-term aspirin use irreversibly blocks the formation of thromboxane A2 in platelets, producing an inhibitory effect on platelet aggregation. This anticoagulant property makes it useful for reducing the incidence of heart attacks. Aspirin produced for this purpose often comes in 75 or 81 mg, dispersible tablets and is sometimes called "junior aspirin" or "baby aspirin." High doses of aspirin are also given immediately after an acute heart attack. These doses may also inhibit the synthesis of prothrombin and may, therefore, produce a second and different anticoagulant effect, but this is not well understood.