Eptifibatide (Integrelin, Corr Therapeutics, South San Francisco, CA) is a cyclic heptapeptide competitive inhibitor of the platelet glycoprotein (GP) IIb/IIIa receptor that has a short half-life. The results of the initial dose-finding and phase III trials are reviewed and the ongoing Enhanced Suppression of the Platelet IIb/IIIa Receptor with Integrilin Therapy (ESPRIT) trial are described.