Emergency contraceptives are How much effective: Its Meritsc & demerits
Emergency contraceptive pills (sometimes referred to as emergency hormonal contraception (EHC) in the U.K.) may contain higher doses of the same hormones (estrogens, progestins, or both) found in regular combined oral contraceptive pills. Taken after unprotected sexual intercourse, such higher doses may prevent pregnancy from occurring. Mifepristone can be used as EC, but is an anti-hormonal drug, and does not contain estrogen or progestins.
The phrase "morning-after pill" is a misnomer; ECPs are effective when used shortly before intercourse, and are licensed for use up to 72 hours after sexual intercourse and the WHO says they can be used for up to 5 days after contraceptive failure (see "Effectiveness" section below).
 Types of ECPs
The progestin-only method uses the progestin levonorgestrel in a dose of 1.5 mg, either as two 750 g doses 12 hours apart, or more recently as a single dose. Progestin-only EC is avai ...more