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The mechanism of action for most anticoagulants is primarily focused on their ability to prevent blood from clotting. Anticoagulants achieve this through various pathways, primarily targeting the coagulation cascade, which includes factors involved in the formation of fibrin, a key component in blood clotting. By inhibiting specific clotting factors—such as thrombin or factor Xa—anticoagulants reduce the formation of fibrin and ultimately decrease the effectiveness of clot formation.

In contrast to platelet inhibitors, which work by directly preventing platelets from aggregating to form clots, anticoagulants act more upstream in the coagulation process. This distinction is crucial in understanding their different roles in managing thrombotic conditions. While anticoagulants are effective in preventing new clots from forming and allowing for the dissolution of existing clots over time, they do not dissolve clots directly or stimulate platelet production, nor do they enhance oxygen transport in the blood. Thus, the correct understanding of their mechanism as preventing clotting underscores their importance in therapeutic settings, particularly in the prevention and management of conditions like deep vein thrombosis, pulmonary embolism, and atrial fibrillation.