The most common consequences of taking Yuketin twice a month are irregular vaginal bleeding and endocrine disruption with menstrual irregularities. Because Yutin is also known as levonorgestrel, this drug is a highly effective progestin. After eating, the main effect is to inhibit ovulation, disturb the normal shape of the endometrium, and make the cervical mucus plug become sticky, not conducive to the passage of sperm, due to these effects can play a contraceptive effect. So after taking it once a month, it may lead to irregular vaginal bleeding, and after taking it twice it is possible to have irregular vaginal bleeding for a longer period of time, and menstruation may be irregular for up to 2-3 months. So this medicine can only be taken once a month, if you take more than one, the possibility of menstrual disorders is very high.