It is very normal to have yellow urine after taking multivitamins, because multivitamins contain many kinds of vitamins, and some vitamins will indeed change the color of urine after taking them, for example, vitamin B will cause yellow urine if it is not completely absorbed after taking it, this is a normal pharmacological phenomenon, no need to worry. As long as you stop taking the multivitamin and increase the amount of water you drink, the urine will soon return to normal and the normal color of urine will appear light yellow. Pay attention and compare the difference in urine before and after taking the medication, as long as there is no particularly obvious color difference, no intervention is needed. Of course, if the urine is still yellow after stopping the medication and after drinking a lot of water, you should consider the possibility of urinary tract infection and seek medical attention in time for active examination and treatment.