Salicylic acid drugs include acetylsalicylic acid and sodium salicylate. Sodium salicylate is only used externally because of its irritation, and it has antifungal and keratolytic effects. Acetylsalicylic acid is the familiar aspirin, with antipyretic and anti-rheumatic effect, often with other antipyretic and analgesic drugs into a compound, for a variety of pain and cold fever treatment. Its anti-inflammatory and anti-rheumatic effect is also very strong, can make acute rheumatic fever patients in 24-48 hours fever, joints, redness and swelling and pain relief, blood sedimentation decreased. Small-dose aspirin has the effect of preventing thrombosis and is used to prevent ischemic cardiovascular and cerebrovascular diseases, such as stable unstable angina, myocardial infarction and ischemic stroke. The main adverse reactions of aspirin are gastrointestinal symptoms such as epigastric discomfort, nausea, vomiting, etc. Larger doses taken orally can cause gastric ulcers and bleeding, and can also lead to coagulation dysfunction, so the medication should be discontinued one week before surgery. A few patients may have allergic reactions, such as urticaria, angioneurotic edema, anaphylaxis. Certain asthmatic patients taking acetylsalicylic acid or other antipyretic and analgesic drugs can induce asthma, called aspirin asthma.