Aspirin has antipyretic and analgesic, anti-inflammatory and anti-platelet aggregation effects. Side effects mainly include gastrointestinal symptoms, allergic reactions, neurological symptoms and so on. 1. Efficacy: Aspirin is a derivative of salicylic acid, with antipyretic and analgesic, anti-inflammatory, and anti-platelet aggregation and other aspects of pharmacological effects. At present, it is widely used in the prevention of thrombosis of cardiovascular and cerebral blood vessels. 2. Side effects: gastrointestinal symptoms are the most common adverse reactions to aspirin, the more common symptoms are nausea, vomiting, epigastric discomfort or pain. Atopic body after taking aspirin can cause skin rash, angioneurotic edema and asthma and other allergic reactions. Neurological symptoms such as headache, dizziness and tinnitus may occur when higher doses are taken. There are also side effects such as liver and kidney damage, effects on the blood system and cardiotoxicity. The main contraindications are: children under 12 years of age; ulcer disease or other active bleeding with bleeding symptoms; hemophilia or thrombocytopenia; ulcer disease or corrosive gastritis. The specific use of the drug needs to consult a professional physician, do not use the drug without authorization, to avoid the occurrence of adverse reactions, resulting in adverse consequences.