Emergency contraception (EC) is a birth control measure, used after sexual intercourse to prevent pregnancy. There are different forms of EC. Emergency contraceptive pills (ECPs), sometimes simply referred to as emergency contraceptives (ECs), or the morning-after pill - are medications intended to disrupt or delay ovulation or fertilization, which are necessary for pregnancy. Intrauterine devices (IUDs) - usually used as a primary contraceptive method - are sometimes used as the most effective form of emergency contraception. However, the use of IUDs for emergency contraception is relatively rare. Definition Emergency contraception is a birth control measure taken to reduce the risk of pregnancy following unprotected sexual intercourse or when other regular contraceptive measures have not worked properly or have not been used correctly. It is intended to be used occasionally and is not the same as medical abortion. Emergency contraception is offered to women who do not wish to conceive but have had unprotected sex on any day of the menstrual cycle, from day 21 after giving birth, or from day five after abortion or miscarriage. Emergency contraception measures include tablets taken by mouth or the insertion of a copper intrauterine device. Emergency contraceptive pills Emergency contraceptive pills (ECPs) are sometimes referred to as emergency hormonal contraception (EHC). They are taken after unprotected sexual intercourse or the breakage of a condom. = Types =A variety of types of emergency contraceptive pills are available, including combined estrogen and progestin pills, progestin-only (levonorgestrel, LNG) pills, and antiprogestin (ulipristal acetate or mifepristone) pills.