Bismuth potassium citrate causing black stool can usually continue to take. Bismuth potassium citrate is a kind of mucous membrane protective agent, in the process of taking the medicine there may be the phenomenon of black stool, which belongs to the adverse reaction of bismuth agent, generally do not need to stop taking the medicine, you can continue to take the medicine according to the course of treatment, and after the condition is cured and the medicine is discontinued, the symptom of black stool will be gradually relieved. However, if taking bismuth potassium citrate also leads to other adverse reactions, such as severe nausea, constipation, etc., the drug needs to be stopped if necessary. Bismuth potassium citrate often needs to be combined with other medications for treating the stomach, the more commonly used ones are acid-suppressing medications, such as omeprazole and rabeprazole, which can better promote the recovery of the disease. Bismuth potassium citrate, in addition to the above mentioned adverse reactions in the digestive system, can also have mild headache, dizziness, insomnia and other symptoms, in addition, long-term use may also cause nephrotoxicity, osteoarthropathy, skin rashes, etc.; allergic to the drug components, severe kidney disease, as well as pregnant women should be prohibited. Bismuth potassium citrate must be used under the guidance of a doctor, patients should not use their own medication.