In clinical practice, thrombolysis usually takes about 7-10 days to complete the dangerous period, but it is also judged according to the actual condition of the patient. The most dangerous is on the day of thrombolysis and within three days, because in this case the clot is likely to form again. Of course, if the dosage of thrombolytic drugs is too high, or if the blood pressure is not well controlled, or if the patient has a disorder in his own clotting mechanism, he may also form brain hemorrhage in the follow-up, so it is more important to actively control the condition within three days. In addition, the period of about seven days after thrombolysis is the relative peak of brain swelling, and only after passing this period intact can we better pass the dangerous period. Therefore, it is still necessary to continue to apply the medication, and if the condition is indeed stable, the dangerous period is basically passed in about 7-10 days.