The emergency birth-control pills (PAE) are common birth-control pills that contain hormones. Although this treatment is known commonly as the morning-after pill, even after 72 hours it can be a cash.
The treatment consists of a dose in 72 hours after the sexual relation, and the second dose 12 hours after the first one.

The capture of the PAE provides a brief and concentrated hormonal exhibition that interrupts the hormonal patterns that are essential for the pregnancy. The hormones production for the ovary diminishes and there falters the development of the uterine endometrio. These alterations are temporary and they last only a few days. But in some cases they alter the first normal cycles.

The use of the PAE reduces the pregnancy risk in 95 % if it takes in the following 24 hours, going down up to 75 % if it is done later. This does not mean that 25 % of women will go so far as to be embarrassed.

In normal conditions, without any contraceptive treatment, of every 100 women who have a sexual relation without protection during the second or third week of his menstrual cycle, close to 8 they will go so far as to remain pregnant women.
If the same women were using emergency contraception tablets the only one ó two would remain pregnant women (a reduction of 95-75 %), depending on the passed hours.

It has been described that 50 % of women that uses the PAE experiences morning sickness and 20 % vomiting. "If the vomiting happens in two o'clock later to the dose, this one must recur".

Almost all women can use the PAE without problems. Although any women at the risk of heart attack, cardiac illnesses, clots in the blood or other cardiovascular problems must not use birth-control pills regularly, experts think that in an emergency the birth-control pills employment as active women (women who are not in bed) does not have the same risks.

The least frequent side effects are headaches, sensibility in the bosoms, sickness and retention of liquids.
Trustworthy studies of the births have not been carried out in women who were already pregnant when they took the PAE, or in those cases in which the PAE failed in the prevention of the pregnancy. Nevertheless, two reasons exist to conclude that the defects of the birth must not be a worry: