Postoperative patients should take antiplatelet drugs as prescribed by their doctors to prevent thrombosis at the stent or dilated vessels, leading to adverse cardiac events such as angina pectoris, myocardial infarction, heart failure and even sudden cardiac death. Routine medications include: (1) aspirin 100-300 mg, 1 time/day, changed to 100 mg, 1 time/day after 1 month, long-term oral; (2) clopidogrel 75 mg (Bolivar, Tyga), 1 time/day, oral for more than 1 year. During the period of taking antithrombotic drugs, blood routine, platelet and liver and kidney function should be reviewed regularly to reduce or prevent the occurrence of adverse drug reactions. In addition, in the following patients, the method of taking antithrombotic drugs needs to be individualized, such as those with left main stem, chronic occlusion, complex lesions, acute coronary syndrome, and multiple severe lesions need to appropriately increase the dosage of clopidogrel from 75 mg daily to 150 mg, 1 time/day for 1-2 weeks and then to 75 mg, 1 time/day; for patients over 80 years old and non-hemorrhagic gastric lesions taking antithrombotic drugs after PCI The maintenance doses of drugs are: clopidogrel 75 mg/day and aspirin 100-200 mg/day; for patients who need to implant common bare metal stents due to vascular lesions, their clopidogrel 75 mg/day orally for more than 1 to 3 months; individual patients need to add cilostazol (PEDA) 50-100 mg, twice/day orally for 6 months to 1 year because they need stronger antithrombotic therapy; with Patients with a history of hemorrhagic gastric lesions should take clopidogrel at a maintenance dose of 75 mg/day after PCI, and if aspirin cannot be applied, they can use a combination of pegylated 50-100 mg twice/day and gastric mucosal protective agents; patients after valve replacement can continue to take warfarin to maintain an INR of 1.8-2.5. Regardless of which type of patients need to stop or reduce their medication early for any reason, they should always consult the relevant physician by phone Do not take the advice of a non-cardiologist or non-interventionist or stop the medication on your own to avoid adverse consequences. Once angina symptoms occur after surgery, patients should return to the original interventional hospital if possible, and if they are seen in other hospitals, they should be informed of their coronary stenting condition so that the outside physician can promptly determine whether in-stent thrombosis has occurred and provide timely treatment accordingly.