Clopidogrel can be taken before or after meals and will not be affected by food. Clopidogrel belongs to the antiplatelet drugs, the main effect is to inhibit the ADP receptor, can reduce the aggregation of platelets, can promote local blood circulation, reduce the risk of thrombosis. Clopidogrel is mainly used for the treatment of ischemic cardiovascular and cerebrovascular diseases, such as coronary heart disease, cerebral infarction, etc. The efficacy of the drug is not affected by food, and can be taken before or after meals. Clopidogrel adverse reactions are nausea, vomiting, diarrhea, skin and mucous membrane bleeding, urinary tract bleeding, gastrointestinal bleeding, cerebral hemorrhage, etc., pay attention to the adverse reactions of the drug in the process of taking the drug, for the drug component allergy, active bleeding patients are prohibited. Clinical oral clopidogrel, should be used under the guidance of a physician, choose the right time to take the drug and indications.