The dangers of Bayer contraceptive pill appear with gastrointestinal symptoms such as nausea and vomiting, increased leucorrhea, weight gain, breast tenderness, dizziness, and irregular vaginal bleeding. The pill is a short-acting contraceptive pill that needs to be taken orally every day on time to achieve a higher rate of contraception, but it is easy to miss a dose, so it can lead to contraceptive failure. It is a hormonal drug, all its effects are to inhibit ovulation and change the viscosity of the cervix, so that sperm and eggs do not easily combine, thus achieving the contraceptive effect. Long-term use can lead to breast enlargement and chloasma. Hormones stimulate breast tissue for a long time and lead to abnormal enlargement.