Ticlopidine, a platelet aggregation inhibitor, is widely used in the secondary prevention of stroke and previous manifestation of peripheral arterial occlusive disease, Ticlopidine is also used to prevent myocardial infarction and post-stenting occlusion after intracoronary stent implantation. The exact mechanism of action of ticlopidine is unclear, but likely involves the inhibition of platelet activity by the suppression of adenosine diphosphate-induced patelet aggregation. The most common adverse effects are gastrointestinal problems, skin reactions, and hematologist changes. The adverse hepatic effects are not frequent(4% in different series).