Above 40 years old is not recommended to take yutin, yutin this drug is a highly effective progestin, because women over 40 years old blood viscosity will increase, if you take yutin, this drug can increase the risk of blood clots, so over 40 years old is not recommended to eat. If contraception is required above 40, it is best to take other contraceptive measures, such as intrauterine devices, or having sex with condoms, which can be effective. If you have sex without protective measures, you can put the IUD in the uterus within 5 days after intercourse in order to prevent pregnancy.