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how to use the morning after pill

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1 how to use the morning after pill on Tue Sep 18, 2012 3:12 pm

lerinha

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People can avoid an unwanted pregnancy in several ways: using condoms, oral contraceptives, injectables, IUDs etc. All these methods can significantly reduce the chance of the woman getting pregnant. Condoms, when used properly, reduce the chances of pregnancy between 90 to 95%.


However,
if a couple has sex without using contraception, or if the method fails
(eg, if the condom broke), and the woman does not want to get pregnant,
what can she do?


In
the U.S., on August 24, 2006, the FDA (which regulates drug
manufacturing in the U.S.) approved the sale of a nonprescription
morning-after pill to women 18 years or older. The generic name for this contraceptive is levonorgestrel. He is also known as Plan B. This version of the pill was approved in the U.S. in 1999, but at the time could not be sold without prescription. It was also in 1999 that this method came to Brazil.


Morning-after pill

AP Photo / Findlay Kember

A dose of two capsules of the following day


The female reproductive system is extremely complex, and the menstrual cycle involves several different hormones. Here is a simplified version of how it works:


*
Soon after the woman's cycle, the pituitary gland (also called
pituitary) monthly cycle starts secreting FSH, or follicle-stimulating
hormone. This hormone "warns" the ovaries when is the right time to prepare a follicle for ovulation.

the fertilized egg

Image courtesy Reproduction Specialists of Georgia

A fertilized egg

* The follicle develops and begins to produce estrogen. It causes the uterine lining to grow it is ready to accept a fertilized egg.

* Shortly before ovulation, the ovaries also secrete progesterone and this continues to occur for about two weeks.

* The hypothalamus and pituitary gland (pituitary) regulate the level of estrogen in the blood. When the level is high enough, the pituitary gland releases the Luteinizing Hormone (LH). This hormone "warns" the follicle to release the egg in the fallopian tube. Sperm can fertilize an ovum in fallopian tube again at 24 hours.

*
If the sperm fertilize the egg during this period and the conditions
are favorable, the fertilized egg is implanted in the uterine lining is
prepared and the woman pregnant. If
there is no fertilization or prevent implantation if anything, the
woman will not get pregnant, and after two weeks of ovulation, will
begin to menstruate. Thus, the cycle repeats.


Although
there is only one 24-hour period for the occurrence of fertilization of
an ovum, sperm may remain in a woman's body for a period of three to
five days. So if a woman has had unprotected sex three days before ovulation, it will be a great chance to get pregnant. For more information, see How does human reproduction.


You can see this description of a drug (a drug) may present less risk in some cases.


What is "Plan B"

The Levonorgestrel is an emergency contraceptive, or a "backup". It can help reduce the chance of pregnancy if the woman is not already pregnant. Levonorgestrel no effect on the mother or the fetus if a woman is already pregnant. RU-486, or mifepristone, a drug is completely different, because it makes a chemical abortion early in a pregnancy.


* He can kill all sperm after ejaculation.

* It can also prevent a fertilized egg from being implanted in the womb.

* Moreover, it can prevent or delay the release of the egg. The Levonorgestrel makes this third way.


By purchasing Plan B, take two tablets. Each contains 0.75 mg of levonorgestrel. You can take the first pill after intercourse without protection and the second 12 hours later.


Although
scientists are not completely sure that this works, they believe that
levonorgestrel prevents pregnancy by stopping the ovulation process or
stop the sperm and egg meet in the fallopian tubes. Some
say the drug can prevent a fertilized egg from being implanted too,
perhaps causing the uterine lining become less receptive to the egg.


The Levonorgestrel does this by disrupting the natural hormonal cycle. It contains a synthetic form of progesterone in high dose (regular tablets birth control show lower dosage). High
doses of progesterone in Plan B interrupt the cycle by preventing
fertilization or embryo implantation, also called implantation happens.


If ovulation has occurred, the Levonorgestrel is less effective. It is therefore important to use the pill as soon as possible after unprotected intercourse. When the fertilized egg is implanted, the pill has no effect.


Because of all these variables, the pill is not 100% effective. However, in clinical studies, we observed an efficiency of 89%.




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