Vitamin B2 is also known as riboflavin. When taken orally and absorbed, some of the vitamin B2 will be excreted through urine, thus causing a yellowish color of urine. In addition to vitamin B2, other compound preparations that contain vitamin B may cause yellowing of urine, which is a normal drug staining condition and not a disease condition. Patients only need to drink more water during the period of taking the drug, which will not lead to urinary stones or increase the probability of other diseases, and after drinking more water, the yellowing of urine can be improved after the urine is diluted. At the same time, if the body’s vitamin supplementation is sufficient, the urine color can also be restored to normal if the drug is stopped early in the state of no vitamin deficiency. So patients do not need to worry too much, just drink more water regularly during the medication, or stop the medication in time after the course of treatment, then the urine can return to normal color.