Although the morning-after pill can be taken up to five days after unprotected sex, it becomes less effective the longer women wait.
The new report is likely to buttress the Obama administration's goal of providing contraception to all women, which has pitted the administration against religious and conservative groups that oppose any form of birth control.
Dr. Jill Rabin, chief of ambulatory care obstetrics and gynecology and head of urogynecology at Long Island Jewish Medical Center in New Hyde Park, N.Y., believes the increased use of the morning-after pill has to do with its longevity and because it has been proven safe and effective.
"It's safer than aspirin," she said.
She also disputes the claim by some conservative groups who see the pill as an abortion pill. "It is definitely not an abortion pill. Once an egg is fertilized, the pill has no power," she said.
"It is far better to prevent an unintended pregnancy if a woman is not ready to conceive," Rabin added.
Planned Parenthood also applauded the new findings, saying the morning-after pill is key to providing women with a choice.
"These data underscores what we see at Planned Parenthood health centers every day -- that birth control is central to women's health and that they must have access to a full range of methods," Deborah Nucatola, senior director of medical services at the Planned Parenthood Federation of America, said in a statement.
"Previous studies also show that emergency contraception is safe for women of all ages and that rates of unprotected sex do not increase when teens have easier access to emergency contraception," she added.
According to Planned Parenthood, the morning-after pill is available in drug stores without a prescription for those 17 and older. For women under 17, a doctor's prescription is needed.
The cost of emergency contraception varies, runnin
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