If the stomach acid causes severe stomach pain, you can choose to take it half an hour before meal, take it with meal or take it 2 hours after meal according to the nature of the medicine to avoid excessive secretion of stomach acid, etc. 1. Half an hour before meal: suitable for gastric mucosa protection agents, such as colloidal bismuth pectin capsules, bismuth pectin, thioglycollate, etc.; gastric stimulants, such as mosapride dispersible tablets, domperidone tablets, etc.; acid inhibiting drugs such as omeprazole, lansoprazole, etc.. 2. Taken with meals:For acid-suppressing drugs such as cimetidine and ranitidine. 3. 2 hours after meal:Magnesium aluminum carbonate, etc. Repeated excessive gastric acid secretion, it is recommended that timely hospital consultation, standardized treatment under the guidance of a doctor, the drug should be used as prescribed.