TOPICS: Contraception, combined contraception pill form, vaginal ring form, patch form, progestins, ethinyl estradiol, inhibit lh and fsh, prevents estrogen surge, prevents lh surge, prevents ovulation, inhibit endometrial proliferation, endometrium is less suitable to implantation of embryo, thickening of cervical mucus, risk of cardiovascular events in smokers >35 years old, migraines with aura, breast cancer, liver disease, copper iud, local inflammatory reaction toxic to sperm and ova, prevent fertilization and implantation, most effective emergency contraception, dysmenorrhoea, heavier and longer menses, active pelvic infection
