Walker is the trade name of volnoxan fumarate tablets, which are used to treat reflux esophagitis. The drug reversibly inhibits the activity of the enzyme in a competitive manner with potassium ions, which can stay in the cellular parts of the stomach wall for a long time and inhibit the production of gastric acid, which can effectively inhibit the formation of mucosal damage in the upper part of the gastrointestinal tract. So clinically the drug is used for the treatment of reflux esophagitis. After the use of the drug there are adverse reactions such as headache, nausea, diarrhea, bloating, constipation, rash, edema. It is contraindicated in patients who are allergic to any of the components of the product; in patients who are being treated with atazanavir or rilpivirine. Taking this product may mask the symptoms of gastric malignant tumors, before starting to use this product should be examined in the hospital to exclude the possibility of malignant tumors; pregnant and lactating women, the elderly should be used with caution. If you need to use the drug, it should be used under the guidance of a specialist, not self-medication to avoid adverse reactions.