Taking medication before meals generally refers to about half an hour before meals, commonly used to promote insulin secretion of glucose-lowering drugs, gastrodynamic drugs, and some enteric tablets, such as enteric aspirin eaten on an empty stomach stable, not easy to disintegrate in the stomach. In case of gastritis or gastric ulcer, medication before meals can act directly on the gastric mucosa, which is conducive to the efficacy of the drug. Usually, after meals, as food gathers in the stomach, if the drug is taken immediately, the drug effect is poorer, and all food has stimulation to the gastric mucosa, which will aggravate the symptoms to some extent. Insulin promoter hypoglycemic drugs taken before meals can promote insulin secretion parallel to the peak of blood sugar in advance, effectively controlling the peak of blood sugar. It should be noted that half an hour after taking such hypoglycemic drugs, meals must be taken in time to avoid hypoglycemia. Some hypoglycemic drugs need to be mixed evenly with starchy food during meals to be effective, such as acarbose. Before using the drugs, you need to read the drug instructions carefully, or under the guidance of a professional doctor, to avoid some contraindications, pay attention to the interaction with other drugs, such as the emergence of adverse reactions need to promptly consult a doctor.