The urine will turn red after taking rifampicin, mainly because after rifampicin is absorbed and metabolized by the body, its metabolites are discharged through the urine, and the metabolites are red, so it makes the urine turn red. Generally speaking, it has no effect on human body, it is not bleeding, it is the color of the metabolites, it is not harmful to human body. Rifampin is a commonly used anti-tuberculosis drug, which has a strong killing effect on tuberculosis bacteria and is an all-bacterial agent. Of course, it has certain side effects, such as allergies, liver function damage, gastrointestinal reactions, etc., and it is necessary to regularly review the blood indicators during taking the drug.