morning-after pill

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pill

 [pil]
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

(môr′nĭng-ăf′tər)
n.
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

See EMERGENCY CONTRACEPTION.
Collins Dictionary of Medicine © Robert M. Youngson 2004, 2005
References in classic literature ?
I've got enough to attend to this morning for I'll have to drive over to White Sands in the afternoon and see Mrs.
He made himself a bed of grass and leaves, lit a fire of dry branches, and slept soundly till the next morning.
She insisted on being left behind, the next morning, when the others went out.
Hitherto, since Sunday afternoon, Adam had been constantly among strange people and in strange places, having no associations with the details of his daily life, and now that by the light of this new morning he was come back to his home and surrounded by the familiar objects that seemed for ever robbed of their charm, the reality--the hard, inevitable reality of his troubles pressed upon him with a new weight.
Yes; Thomas had heard the concert; he had been paid for to go in at the back; it was a loud concert; it was a hot concert; it was described at the top of the bills as Grand; whether it was worth traveling sixteen miles to hear by railway, with the additional hardship of going back nineteen miles by road, at half-past one in the morning -- was a question which he would leave his master and the young ladies to decide; his own opinion, in the meantime, being unhesitatingly, No.
The house-maids had had a peep at him that morning, and had wished--like Desdemona, with a difference--that "Heaven had made all three of them such a man."
"Just snuffed out," said the other; "he died at four o'clock this morning; all yesterday he was raving -- raving about Skinner, and having no Sundays.
Michael's pear-tree, where nobody would find him till the morning."
Each morning she awoke with hope, and each night she was a prey to despondency.
It was in the winter when this happened, very near the shortest day, and a week of fog into the bargain, so the fact that it was still very dark when George woke in the morning was no guide to him as to the time.
I turned him out of my house this morning. He was here; they admitted him spite of my request that they should let no one in," he went on, glancing angrily at his daughter.
At eleven in the morning they emerged at the foot of the lake.