Whether or not western medicines need to be taken after meals or how long to take them after meals needs to be decided according to the effects of the medicines and cannot be generalized. Reasonable choice of time to take the drug can reduce the damage of the drug to the stomach, and at the same time get a better therapeutic effect. Specific time nodes for taking drugs are: fasting, before meals, after meals, with meals, etc.. 1. Fasting: no food in the stomach is fasting, 1 to 2 hours before meals and 2 to 3 hours after meals are fasting. Drugs that need to be taken on an empty stomach include: liquid paraffin, tonic herbs and other drugs. 2. Before meal: it means to be taken within 15-30 minutes before meal. Drugs include: domperidone, cisapride, metoclopramide sodium, omeprazole and so on. 3. After meals: refers to 15-30 minutes after meals to take drugs, the purpose of which is to reduce the stimulation of drugs on the stomach and intestines, and secondly, some of the drugs will have a better effect when taken after meals. Drugs are: aspirin, ferrous sulfate, spironolactone, fat-soluble vitamins and so on. 4. Taken with meals: can enhance the effectiveness of the drug, give full play to the role of drugs. Drugs are: metformin, acarbose, carvedilol, clarithromycin and so on. In addition to diet, there are other factors that affect the efficacy of drugs in the process of taking medication, which need to be treated under the guidance of a professional doctor.