Anticoagulant therapy with heparins or oral vitamin K antagonists and
antiplatelet therapy are widely used in cardiology. There is current c
onsensus as to when these medications should be used and how the patie
nts who use them should be monitored. Recommendations should be adhere
d to scrupulously to ensure optimal efficacy. Thromboembolism and blee
ding sometimes occur in patients receiving optimal anticoagulant or an
tiplatelet therapy. Some cases of bleeding are ascribable to use of hi
gh doses in an attempt to avert devastating thrombotic events. Most, h
owever, are due to failure to adhere to basic rules for prescribing an
d monitoring anticoagulant and antiplatelet drug therapy. In some inst
ances, the treatment is used in patients with a low or negligible risk
of thrombosis, making the occurrence of adverse effects particularly
unacceptable. Thus, there is still room for further optimizing the use
of anticoagulant and antiplatelet agents. Low-molecular-weight hepari
ns, antiplatelet agents, or various combinations of drugs may be most
appropriate in some patients. Development of more effective and/or saf
er agents is impatiently awaited.