Cyclic peptide that acts as a platelet glycoprotein IIB-IIIA antagonist, reversibly inhibiting the binding of FIBRINOGEN; VON WILLEBRAND FACTOR; and other adhesive molecules to the GPIIB-IIIA RECEPTORS of platelets. It is used in the management of UNSTABLE ANGINA and in patients undergoing coronary ANGIOPLASTY and stenting procedures.