When you have a heart attack, you will most likely need to take medications for the rest of your life. To treat coronary artery disease (CAD), you may be prescribed different types and combinations of drugs, and your doctor or other health care provider will decide which treatment combination is right for you. Cardiac injections reduce the ability of blood to clot (coagulate). Although not blood thinners, they block the formation of blood clots. By preventing harmful clots from forming in the blood vessels, the medication helps prevent strokes and heart attacks. The clots may not become bigger and cause more serious consequences. Cardiac injection is prescribed often to prevent first or recurrent strokes.