Bismuth Citrate Potassium Tablets can cause black stools, which is a very common adverse drug reaction to bismuth, and there will also be a black tongue, including colloidal bismuth pectin and gastric bismuth magnesium, also black stools, iron, carbon powder is also black stools and other adverse reactions. For the above drugs caused by the black stool will disappear soon after stopping the drug, patients do not need to be nervous. Bismuth potassium citrate tablets are bismuth agents, which means that they contain heavy metals, and the drug should not be used for a long time to avoid causing bismuth poisoning. Bismuth potassium citrate is used in the eradication of Helicobacter pylori, it is recommended that patients need to follow medical advice regular medication, should not blindly use the drug for a long time on their own, otherwise it will cause serious adverse reactions.