There is more than one manufacturer and size of clopidogrel, but the general recommended dosage is 75 mg once daily for adults, with an initial loading dose of 300 mg of clopidogrel for patients with acute coronary syndromes, followed by consecutive doses of 75 mg once daily. Clopidogrel is a class of drugs used in patients with recent myocardial infarction, ischemic stroke, and peripheral arterial disease, and may be used in combination with aspirin in patients with acute coronary syndrome. Its metabolites inhibit platelet aggregation, and platelet aggregation and bleeding time generally return to baseline levels 5 days after discontinuation of therapy. The dosage of the drug is 75 mg once daily, and patients with acute coronary syndromes with ST-segment elevation should start with a single dose of 300 mg, followed by 75 mg per day continuously, in combination with aspirin; in patients without ST-segment elevation the dosage is the same as above, but the dose varies according to the specific situation if aspirin is used in combination. If a dose is missed within 12 hours of the regular dosing time, a replacement dose should be taken immediately. The specifics of the drug should be judged according to the condition, the drug may appear after the use of bleeding, hematoma and other adverse reactions, allergy, severe liver damage and active pathological bleeding patients should not be used, please consult a physician before using the drug.