Tranexamic acid (TXA), an antifibrinolytic, is routinely used to decrease transfusion rates in total joint replacement surgery. While recent publications have indicated a low risk of TXA-associated thromboembolic events in this orthopedic population, few studies specifically address the safety of TXA administration in high-risk patients. We present a case of acute coronary thrombus requiring emergent intervention in a patient with indwelling coronary stents who underwent shoulder arthroplasty with TXA administration.