morning-after pill

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morning-after pill popular name for an emergency postcoital contraceptive containing a high dose of the hormones usually found in an oral contraceptive, either an estrogen plus a progestational agent, or the latter alone; used to prevent pregnancy after unprotected intercourse occurs, or after a contraceptive method fails during intercourse, administered orally.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

morning-after pill (MAP),

an oral drug that, when taken by a woman within 2-3 days after intercourse, reduces the probability that she will become pregnant.

The U.S. Food and Drug Administration (FDA) has approved two regimens for postcoital contraception. The Yuzpe regimen consists of a combination of progestogen (levonorgestrol 0.25 mg or norgestrel 0.5 mg) and estrogen (ethinyl estradiol 100 mcg) taken at once and repeated in 12 hours. Alternatively, two doses of levonorgestrel 0.75 mg may be taken without estrogen. With either regimen, the first dose should preferably be taken within 24 hours after intercourse, and not more than 72 hours after. The Yuzpe method reduces the likelihood of pregnancy by about 57%, the levonorgestrel method by 85%. About 50% of women experience uterine bleeding within 1 week and most of the rest within 3 weeks unless conception has occurred. If taken early enough, the hormones may prevent fertilization by altering tubal function or exerting toxicity against the ovum. Probably, however, they usually act by preventing implantation of a fertilized ovum. This is not emergency contraception but rather chemical abortion. The incidence of nausea is about 40% with levonorgestrel alone and about 65% with the Yuzpe regimen. Headache, fluid retention, and breast tenderness may also occur. This procedure is contraindicated in women for whom oral contraceptives are contraindicated, such as those with hypertension or a history of stroke or thromboembolic disease. The short course of high-dose hormones probably does not interrupt a pregnancy after implantation has occurred, and there is no evidence that fetal harm has occurred when such a pregnancy has continued to term. However, hormone use is contraindicated in known pregnancy or if the woman has had unprotected intercourse within the preceding 3-10 days. An application for over-the-counter marketing of levonorgestrel has been denied by the FDA.

Farlex Partner Medical Dictionary © Farlex 2012

morning-after pill

Any of various oral drugs that are intended to prevent pregnancy for up to five days after sexual intercourse by delaying or inhibiting ovulation, preventing fertilization of an egg, or preventing implantation of a fertilized egg.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.

emergency contraception

A popular term for secondary “contraception” used in the event of failure or suboptimal “primary contraception”.
Segen's Medical Dictionary. © 2012 Farlex, Inc. All rights reserved.

morning-after pill

Emergency contraception, interception pill Gynecology A high-dose estrogen given in the early post-ovulatory period to prevent implantation of a potentially fertilized egg after unprotected intercourse. See Contraception, DES, Norplant, Pearl index, RU 486.
McGraw-Hill Concise Dictionary of Modern Medicine. © 2002 by The McGraw-Hill Companies, Inc.

morning-after pill

Collins Dictionary of Medicine © Robert M. Youngson 2004, 2005
References in periodicals archive ?
This means that any Irish child with access to the internet and a credit card could easily order the morning-after pill online.
Until now, the age limit was 16, and the morning-after pill was given only to women who had been raped.
A year-long study of Britain's health authorities by Nottingham University Business School seems to show that those areas which expanded family planning services for teenagers - including giving out the morning-after pill in schools - saw soaring rates of sexually transmitted infection but no reduction in pregnancy.
Under the scheme, schoolkids are issued with 'C cards' resembling credit cards which allow them to get free condoms and chlamydia testing kits It also allows school nurses to refer schoolgirls as young as 13 to clinics for the morning-after pill.
The latest controversy about the morning-after pill has placed the Catholic bishops at odds with several members of Fox's center-right Partido Accion Nacional (PAN).
First, they must ensure that the morning-after pill is placed in a section that is accessible to consumers but also under the watchful eye of store personnel.
International research had shown that the vast majority of women, having had to use the morning-after pill once, were prompted to arrange routine contraception.
`What's the difference between the abortion pill and the morning-after pill?
arrangements to allow women to get abortifacient drugs." The central point of this legal argument is that medications like the "morning-after pill" must be made available to all women who seek them.
The so-called morning-after pill is really a kit made up of four birth-control pills--two taken together within 72 hours of unprotected intercourse, followed by two more 12 hours later (SN:08/15/98, p.
"People get the idea that treating HIV is no big deal." Some gay men refer to the latest HIV treatments as "a morning-after pill," says Dan Wohlfeiler, education director of STOP AIDS Project San Francisco, an HIV prevention agency.