The most common side effects of clopidogrel tablets are as follows: i. Gastrointestinal reactions, including stomach pain, indigestion, constipation, and gastrointestinal bleeding. Second, bleeding of the organism, because the mechanism of action of clopidogrel tablets is to inhibit the aggregation of platelets, not only bleeding from the digestive tract, oral cavity and nasal cavity, but also bleeding from the organs can occur. Third, the reaction of skin system, can appear skin mucous membrane bleeding and petechiae, rash, etc. IV. Rare but possible granulocyte abnormalities, leukopenia and granulocyte deficiency. V. Occasional allergic reactions and headaches, dizziness, etc. The above side effects have a low chance of occurrence, and as clinically used drugs are tested at all levels, as long as the drug is used in strict accordance with the guidance of clinicians, the occurrence of side effects can be completely avoided and play a good role in the prevention of cardiovascular and cerebrovascular diseases and cerebral infarction.