Generally, patients are advised to take Lansoprazole before meals. Lansoprazole is mainly used for the treatment of gastric ulcers, duodenal ulcers, reflux esophagitis, and Droege-Ayer syndrome. It is recommended to take Lansoprazole thirty minutes before meals to promote the contact of the drug with the stomach lining, avoid the influence of food on the absorption of the drug, and make the drug work better. Adverse reactions such as rash, itching, constipation, and diarrhea may occur with the use of this medication, so stop using the medication if any of these symptoms occur. This drug is contraindicated in patients who are allergic to lansoprazole and any of the ingredients in the prescription, as well as in patients who are using atazanavir sulfate. In addition, patients are advised to use Lansoprazole under the supervision of a doctor and not to use it privately.