Mild side effects such as irregular bleeding, mood changes, and headaches are witnessed among few women. It is not recommended to those people who have a previous history of depression and breast cancer. Continuous use increases the risk of developing ovarian cysts and ectopic pregnancy but reduces the risk of endometrial cancer and pelvic inflammatory disease. It results in decreased menstrual cramping, pain, lighter periods, and prevents anemia.

Mini pills thicken the cervical mucus thereby preventing the entry of the sperms. They may also prevent the transportation of the egg from the ovary to the uterus.