Rifampin is an anti-tuberculosis drug, and the phenomenon of red urine can occur after the application of rifampin. Generally, the phenomenon of red urine will gradually disappear on its own about two days after the drug is stopped. The redness of urine caused by rifampicin is mainly due to the metabolism of the red pigment, which is excreted with the urine and does not have any effect on the health of the patient. If the urine is red and you don’t know what the cause is, you can go to the hospital for urine routine, ultrasound and other tests to clarify the presence of related diseases. The redness of urine caused by rifampin is distinctly different from what is usually called hematuria, which is mainly caused by urinary tract infections, stones, tuberculosis, tumors, etc.