Explanation on the working of emergency contraceptive pills?

Question

Emergency pill contains levonorgestrel. It is said that it prevents the sperm from fertilizing the ovum and also prevents the fertilized ovum from attaching to the lining of the endometrium. But what is the medical reason behind this?

Answer 1

The emergency "morning after pill" that contains only levonorgestrel is known as Plan B.  It's one of a class of synthetic forms of progesterone called 'progestins' and they use them in different kinds of birth control pills because actual progesterone is not good for taking orally.

The main reason for its ability to prevent pregnancy is probably simply by preventing ovulation from taking place.  It does this by basically fooling the body into thinking that it is already pregnant--natural progesterone levels are raised during pregnancy, so the body reacts as though it's already pregnant and stops ovulating.  (There is a natural progesterone cycle in women and normal menstrual bleeding is actually because of cyclic progesterone withdrawal.)

The FDA says, and I quote, "It is possible that Plan B may also work by preventing fertilization of an egg (the uniting of sperm with the egg) or by preventing attachment (implantation) to the uterus (womb), which usually occurs beginning 7 days after release of an egg from the ovary."  Essentially, I take that to mean that they think it *might* work that way, but they don't have any definite studies that say that it does.

Answer 2

Levonorgestrel works to prevent pregnancy by several different methods. The first thing that is necessary to know is the definition of pregnancy. Most people think a woman is pregnant when one of her eggs is fertilized by sperm. False. According to medical definition, pregnancy occurs when a fertilized egg attaches and implants itself in the lining of the uterus.

First, levonorgestrel prevents ovulation. Without an egg being released, fertilization (much less implantation) cannot occur.

Second, if an egg is released, levonorgestrel produces mucus that makes it more difficult for sperm to swim, reducing the liklihood of fertilization (and therefore, implantation).

Third, if an egg has already been released and sperm does by chance happen to get to it and fertilize it, levonorgestrel still has a last chance to prevent pregnancy because it prevents a fertilized egg from impanting into the uterus because it thickens the mucus in the lining of the uterus and literally makes it too slippery for the fertilized egg to attach. Therefore, even though you may have had s*x 3 days ago and may have a fertilized egg, levon. still prevents pregnancy by keeping it from attaching. *This is why Emergency contraceptive pills are not abortions because although the egg is fertilized, the woman is NOT pregnant yet until it attaches to the uterus! This is why this medication can be taken up to five days after unprotected s*x.

Hopes this helps!

Answer 3

for accindetal mistake or over entusiastic fun,

use I-pill