When patients are treated with chlordiazepoxide, the pink color of the drug residue is due to the fact that chlordiazepoxide needs to be put into the vagina of female patients for the treatment of diseases, and there are bacteria in the vagina of women, which under normal circumstances reach a state of equilibrium and do not cause diseases. The drug will be decomposed by these bacteria in the vagina, the vaginal wall will have shed cells, and cervical mucus secretion into the vagina, and the drug to form a mixture, in the outflow of the patient’s body, there will be a pink discharge of drug residue phenomenon, this is a normal phenomenon. If the patient has bright red blood while undergoing medication, it cannot be ruled out that the condition is an organic gynecological disease, so it is necessary to go to the hospital in time to avoid delaying treatment.