Taking bismuth potassium citrate usually does not cause yellow urine. Bismuth potassium citrate is a gastric mucous membrane protector, can be used for the treatment of chronic gastritis, as well as relief of gastric pain, heartburn and acid reflux caused by excessive stomach acid, etc. Adverse reactions after the use of the drug may lead to black tongue, as well as grayish-black stools, with ammonia taste in the mouth, generally does not cause yellow urine symptoms, occasionally nausea, constipation and other adverse reactions. The drug is contraindicated in patients with severe kidney disease and pregnant women, milk and antacids will affect the drug effect, can not be taken at the same time, tetracycline taken at the same time will affect the absorption of the latter. Yellow urine can be caused by concentrated urine or by taking other medications. In addition, it should be considered whether there is any disease (urinary tract infection, stones, jaundice, etc.) that causes yellow urine. If the symptoms of yellow urine do not improve by drinking more water, you need to consult a doctor to determine the cause of the problem and then treat it.