As emergency contraceptive pills are composed of large doses of progesterone, their side effects are more numerous and they have particularly high side effects. It is recommended that they should not be taken more than three times a year and that the interval between two doses should be more than four months. Taking emergency contraceptive pills twice in two days may have a great impact on a woman’s body, and it is recommended not to take them in this way. They may affect the normal endocrine function of the ovaries after taking the pills, leading to menstrual disorders, and they may also cause persistent irregular vaginal bleeding. Such women should take vitamin C, along with large doses of water, to speed up the metabolism of emergency contraceptive pills in the body. If irregular vaginal bleeding occurs, symptomatic hemostatic conditioning treatment is needed.