Bismuth potassium citrate is metabolized by the liver and kidneys, long-term use will cause kidney damage, bismuth toxicity and so on. So it is not recommended to take it for more than seven days, if there is no relief after seven days of taking the medicine then it is recommended to go to the hospital for consultation. Bismuth potassium citrate granules are gastric mucous membrane protectors, used for gastric and duodenal ulcers, chronic superficial gastritis and when accompanied by Helicobacter pylori infection. This drug is taken with boiled water, and the dosage is 1 sachet 4 times a day or 2 sachets twice a day, and please follow your doctor’s advice whether to continue to take it after 7 consecutive days. But taking bismuth potassium citrate not more than seven days is not absolute, used to kill Helicobacter pylori can be taken for 10-14 days. Patients may have an ammonia taste in the mouth during the period of taking the medicine, and may make the tongue and stools grayish-black, which disappears by itself after stopping the medicine. Occasionally see nausea, constipation and other adverse reactions. It is contraindicated in renal insufficiency, pregnant women and people who are allergic to this product. This product can not be taken with milk, tetracycline tablets at the same time, milk and other high-protein foods and antacids can interfere with the action of this product; with tetracycline tablets will affect the latter’s absorption. It is recommended that patients should consult a doctor before taking the drug, and if there is any discomfort during the period of taking the drug, please consult a doctor in time for examination and treatment. The medication should be taken under the guidance of a physician, do not take the medication on your own.