Expired iodophor is recommended not to be used again. Iodophor can kill bacteria, fungi, some germs and protozoa, etc. It is used more often in clinical as well as home life. It can be used for disinfection of skin wounds, surgical sites, surgical instruments, etc. Iodophor is valid for one year and two years. For home use, it is recommended to buy small bottles for easy storage, as iodophor evaporates easily. It is recommended to use iodophor for one month after opening, the best effect is within one month, longer time has no disinfection effect. The drug is longer and its nature may change after the expiration date. At this time, if used again not only can not achieve the effect of treatment, but also may have other side effects.