Emergency contraception (EC), or emergency postcoital contraception, are birth control measures that, if taken after sexual intercourse, may prevent pregnancy. Forms of EC include: Emergency contraceptive pills (sometimes referred to as emergency hormonal contraception (EHC) in Great Britain) may contain higher doses of the same hormones (estrogens, progestins, or both) found in regular combined oral contraceptive pills. Taken after unprotected sexual intercourse or contraceptive failure, such higher doses may prevent pregnancy from occurring. The phrase 'morning-after pill' is a misnomer; ECPs are most effective when used shortly after intercourse. The progestin-only method uses the progestin levonorgestrel in a dose of 1.
Contributions by Chooserr, Andrew c, and BuddhaInside.