Some, but not all morning-after pills are available without prescription to women aged 17 and older.
According to Planned Parenthood, morning-after pills cost from about $10 to $70. IUD insertion, which requires a doctor's office visit, can cost $500 or $1,000, according to Planned Parenthood.
For any form of emergency contraception, the earlier it's done the better. In the studies reviewed by Trussell, the time from unprotected sex to IUD insertion ranged from two days to more than 10 days, but he said within five days is best.
An IUD is a T-shaped piece of plastic, inserted into the uterus via the cervix. One sold in the United States, ParaGard, releases copper. The other, Mirena, releases the hormone levonorgestrel. The levonorgestrel system has not been studied for use as an emergency contraceptive, as the copper model has, according to Trussell.
Exactly how the IUD works isn't certain. Experts say it may prevent the sperm and egg from joining. Or, it may change the lining of the uterus so that a fertilized egg can't attach.
Recently, the use of IUDs in the United States has increased, the researchers said, with about 5 percent of women at risk of pregnancy using it. In the 1970s, the device fell out of favor after safety fears linked with an IUD known as the Dalkon shield, which was withdrawn from the market.
However, IUDs on the market today are improved, the authors said. The American Congress of Obstetricians and Gynecologists and other organizations consider them safe for most women.
The morning-after pill contains hormones that may work by thickening cervical mucus so the sperm and egg can't join or by affecting the lining of the uterus as the IUD does. The morning-after pill is not an abortion pill. Makers of the pills (such as Plan B, ella) provide timing instructions for users.
Women should know that certain problems will prevent them from being able to get an IUD inserted soon after unprotecte
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