Adverse reactions exist in every drug, but the degree and incidence of reactions vary, and the mechanisms of occurrence are complex. With the advent of pharmacists, the situation of adverse drug reactions is greatly avoided. Firstly, it is important to avoid drug abuse and reduce the number of combined medications. Secondly, choose the appropriate method of drug administration, strictly control the interval, duration and course of drug administration, and prevent mechanical poisoning. Pay attention to age, gender, pregnancy and breastfeeding women and individual differences, and pay attention to the interactions between drugs and contraindications. As a physician, you should carefully read through the adverse drug reactions before using the drug, especially for new drugs. As a patient, you should also read the drug’s instructions carefully before taking the drug to understand the adverse effects of the drug, and consult your doctor or pharmacist if you do not understand. For people who have a history of drug allergy, family history of allergy and idiosyncratic body, they should take the initiative to inform the doctor and pharmacist of their drug allergy history and what drugs they have taken and had adverse reactions, so that the doctor and pharmacist can do their best to prevent adverse reactions that have occurred or are suspected to occur according to each person’s situation. If an adverse reaction occurs while taking the drug, you should go to the hospital promptly for symptomatic treatment and take measures to stop or reduce the dosage or continue treatment as appropriate.