Long-term use of Daying-35 can cause the following hazards: First, Daying-35 is detoxified by the liver and excreted by the kidneys, so it may cause damage to liver function and can lead to damage to kidney function, so it is recommended to do laboratory tests of liver and kidney function when using the drug for three consecutive menstrual cycles. Secondly, Daying-35 is a short-acting contraceptive, mainly containing estrogen and progestin, to achieve the purpose of contraception in clinical practice. If taken for a long time, it may lead to water and sodium retention and weight gain due to the presence of estrogen. Thirdly, amenorrhea may occur because the endometrium of the uterus will become thinner after taking Da-Ying-35, which will lead to a decrease in menstrual flow and amenorrhea.