Coagulation is a complex process in which multiple enzymes and proteins regulate blood flow and clot formation. Coagulation (clot formation), fibrinolysis and platelet aggregation are a part of this process. Fibrinolysis refers to the breakup of blood clots. It is a normal body process that keeps naturally occurring blood clots from growing and causing problems. Anticoagulant drugs help prevent blood platelets from sticking or clumping together, reducing the likelihood that arteries will be blocked by a clot, leading to a stroke or heart attack.