It is not recommended to use iodophor after the expiration date because it will affect the sterilization effect. Iodophor can be used for at most one month after opening the lid. If it is more than one month, you should dispose of it in time and not continue to use it to avoid delaying the disease. Iodophor is mainly a complex of iodine, through the slow release of iodine can play a bactericidal effect. Because iodine is an extremely active halogen element, it has a very good effect of killing microorganisms and can act directly on human proteins, combining with bacteriophage proteins, thus destroying bacteriophage proteins and enzymes, resulting in the death of microorganisms due to metabolic disorders. iodophor can play a good role in sterilization and disinfection of bacteria, viruses, fungi and protozoa.