morning-after pill


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Related to morning-after pill: Emergency Birth Control, Emergency contraceptive pill

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.

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.

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.

morning-after pill

Etymology: AS, morgen + aefter + pilian, to peel,
Usage notes: (informal)
a large dose of an estrogen, given orally, over a short period, to a woman within 24 to 72 hours after sexual intercourse to prevent conception, most commonly in an emergency such as rape or incest. The woman is warned that the medication may cause the formation of clots, severe nausea and vomiting, and teratogenic and carcinogenic effects on the fetus if pregnancy already exists or if contraception fails. The availability of mifepristone provides an alternative and |mf100% effective method for preventing pregnancy with fewer side effects; a single dose prevents pregnancy by preventing implantation.

emergency contraception

A popular term for secondary “contraception” used in the event of failure or suboptimal “primary contraception”.

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.

morning-after pill

See EMERGENCY CONTRACEPTION.
References in periodicals archive ?
Side-effects of the pill include nausea, vomiting, headaches, mood swings and back pain, similar to the conventional morning-after pill.
But the best form of contraception is to make sure you don't need the morning-after pill - at Christmas or any other time.
The protocol for rape victims should include administering them the morning-after pill.
Dr Thom promised when they introduced the morning-after pill service in Britain two years ago that they would take all reasonable steps to ensure the contraceptives would not fall into the hands of underage girls.
The reality of the morning-after pill is that it can act as an abortifacient, therefore Ann Furedi's suggestion that it gives women a second chance to avoid a problem pregnancy is false.
When asked if her strong support of the morning-after pill could be a gateway to introducing legalized abortion, Bachelet deflected the question.
Oregon law does not require pharmacists who object to dispensing the morning-after pill to do so.
Particularly vehement religious fervor is now focused on the morning-after pill, which prevents pregnancy within the first few days after intercourse--sometimes by flushing out a fertilized egg.
6 /PRNewswire/ -- While the Food and Drug Administration (FDA) weighs a second request by Barr Laboratories to sell its morning-after pill "Plan B" over-the-counter without a prescription, a new study in the Journal of the American Medical Association shows that such a change would have no effect on pregnancy rates.
The Sunday Mercury conducted a straw poll of primary care trusts to see which would allow its doctors to hand out prescriptions for the morning-after pill in advance.
GIRLS as young as 13 will be able to get the morning-after pill without their parents' knowledge under a controversial sex health scheme.
The bitter conflict between church and state erupted again in late January after the federal government approved the use of the so-called morning-after pill as part of its revised family-planning policy Norma Oficial Mexicana de los Servicios de Planificacion Familiar.