Patients who have induced asthma, active peptic ulcers, bleeding conditions or severe heart failure after taking aspirin or other NSAIDs are not suitable to be treated with aspirin to avoid adverse reactions. Aspirin is an antiplatelet drug, which is mainly used clinically for the treatment of coronary heart disease, carotid plaque, cerebral infarction and other diseases with very good effect. The drug is commonly used in the form of enteric tablets, which are recommended to be taken half an hour before meals or at bedtime to improve the safety of drug treatment and reduce the stimulation of the stomach. A common side effect of aspirin is bleeding reactions, which should be closely observed during use. If bleeding reactions such as black stools and hematuria occur, you must go to the hospital promptly and give appropriate treatment.