Xemilofiban [SC 54684, SC 54684A (HCl), xemlofiban], an orally active antiplatelet agent, is a glycoprotein IIb/IIIa receptor antagonist. This drug was in a phase III clinical trial in the US and Europe for the treatment of thrombosis in patients with unstable angina pectoris and acute myocardial infarction undergoing angioplasty. Because of insufficient evidence of efficacy and concerns about safety over this long of a period of treatment, these trials didn’t get the market approval. In Japan, Sankyo discontinued the development of xemilofiban for thrombosis at phase II following Searle's decision to drop the project.