Lansoprazole is suitable to be taken before meals or at bedtime. Lansoprazole, as a kind of acid-suppressing drug, is suitable to be taken before meals because food will delay the onset of action of the drug, and taking it before meals can effectively reduce the amount of gastric acid secretion after eating. It is recommended to take before bedtime because the gastric acid secreted at night is more likely to cause damage when it comes into direct contact with the mucous membrane in the fasting state, so taking lansoprazole before bedtime can protect the gastric mucous membrane. Lansoprazole is mainly used in the treatment of gastroduodenal ulcer and reflux esophagitis. Adverse reactions include allergy, anemia, constipation and diarrhea. Allergic individuals are prohibited from using the drug. The use of the drug should be under the guidance of a doctor and should not be used without authorization.