Aspirin enteric-coated tablets are taken orally before meals, and regular tablets and extended-release tablets are taken orally after meals. Aspirin is available in a variety of clinical dosage forms, including enteric-coated tablets, enteric-coated capsules, and extended-release tablets. Aspirin enteric-coated tablets are recommended to be taken orally before meals, and aspirin extended-release tablets are recommended to be taken orally after meals, as suggested by the drug insert. Enteric-coated tablets do not dissolve in the stomach, and oral intake before meals can reduce the adverse effects of the drug. Extended-release tablets are taken after meals to increase the duration of action of the drug. Aspirin belongs to the prescription drugs, the clinical scope of application is relatively wide, mainly to ischemic cardiovascular and cerebrovascular diseases, such as coronary heart disease, cerebral infarction and so on. Adverse reactions of aspirin include stomach pain, gastric distension, gastric bleeding, skin mucous membrane bleeding, urinary tract bleeding, intracranial hemorrhage, and respiratory distress. It is contraindicated in patients who are allergic to aspirin components, aspirin-related asthma, active bleeding, active ulcers, and hemophilia. Aspirin should be used under the supervision of a physician, and pay attention to adverse reactions and contraindications to the drug.