Metronidazole is an antibacterial drug, mainly used for anaerobic bacterial infections, and also in the treatment of Helicobacter pylori infection in gastritis. The color of metronidazole tablets is white, so from the action of the drug itself, taking metronidazole will not cause the urine to turn yellow. If the phenomenon of yellow urine occurs, there are several possibilities: first, drink less water in the process of taking the medicine, the urine will become a little more yellow than usual after concentration. Second, combined with liver problems, such as liver function impairment or eating other drugs, while eating other drugs leading to liver function impairment, there may also be an increase in blood bilirubin, resulting in the phenomenon of yellow urine.