Taking emergency contraceptive pills excessively may lead to infertility. Emergency contraceptives contain highly effective hormonal ingredients, mainly working by altering the viscosity of cervical mucus and affecting the implantation of fertilized eggs. Emergency contraceptive pills can cause menstrual irregularities and disorders, leading to irregular vaginal bleeding. Some may also affect ovulation and the motility of the fallopian tubes, while also causing symptoms such as breast tenderness, nausea, and vomiting. Excessive use of emergency contraceptive pills can significantly affect the endocrine system, potentially leading to infertility and, in some cases, ectopic pregnancy. Therefore, emergency contraceptives should not be used as a regular method of contraception.