WASHINGTON (AP) - Women's groups cheered the government's decision to allow 17-year-olds to buy the "morning-after" emergency contraceptive without a doctor's prescription, but conservatives denounced it as a blow to parental supervision of teens.

The Food and Drug Administration said Wednesday it would accept, not appeal, a federal judge's order that lifts Bush administration restrictions limiting over-the-counter sales of "Plan B" to women 18 and older. U.S. District Judge Edward Korman ruled last month in a lawsuit filed in New York that President George W. Bush's appointees let politics, not science, drive their decision to restrict over-the-counter access.

Women's groups said the FDA's action was long overdue, since the agency's own medical reviewers had initially recommended that the contraceptive be made available without any age restrictions.

Korman ordered the FDA to let 17-year-olds get the birth control pills. He also directed the agency to evaluate clinical data to determine whether all age restrictions should be lifted.

The FDA's latest action does not mean that Plan B will be immediately available to 17-year-olds. The manufacturer must first submit a request.

"It's a good indication that the agency will move expeditiously to ensure its policy on Plan B is based solely on science," said Nancy Northup, president of the Center for Reproductive Rights, which filed the lawsuit.

Conservatives said politics drove the decision.

"Parents should be furious at the FDA's complete disregard of parental rights and the safety of minors," said Wendy Wright, president of Concerned Women for America.

Plan B is emergency contraception that contains a high dose of birth control drugs and will not interfere with an established pregnancy. It works by preventing ovulation or fertilization. In medical terms, pregnancy begins when a fertilized egg attaches itself to the wall of the uterus.

If taken within 72 hours of unprotected sex, it can reduce a woman's chances of pregnancy by as much as 89 percent.