So many great questions! So both things are used for a heart failure or a heart attack. The beta blocker is used to make the heart beat slower, so it doen’t stress too much. A clot buster is a drug that is used to dissolve a blood clot. Sometimes a heart attack is caused by a blood clot blocking an artery. IF you give this to the person the blood will be “thinner” and maybe the blood flow through the artery can be recovered. I hope that answers your question!