Alteplase is a medication used to dissolve blood clots in patients experiencing conditions like ischemic stroke, myocardial infarction, or pulmonary embolism. It is a type of thrombolytic agent that works by breaking down fibrin, a protein that helps form clots, thereby restoring blood flow to affected areas. Administered intravenously, alteplase is most effective when given shortly after the onset of symptoms. However, it is not suitable for everyone, as it can increase the risk of bleeding. Medical professionals carefully evaluate patients to determine if alteplase is the right treatment option based on their specific circumstances.