The AMA's policy-making House of Delegates approved the resolution without discussion during a convention in Orlando. The AMA has 293,000 doctors as members.
``This is a wonderful decision by the AMA. This is a terrific resolution,'' said Joan Coombs, senior vice president of Planned Parenthood. She said widespread use of the morning-after pill could prevent 1.7 million unplanned pregnancies and 800,000 abortions annually.
Taken within three days of sexual intercourse, the prescription morning-after pill prevents ovulation or, if that has already occurred, blocks implantation of a fertilized egg in the uterus. AMA members suggested that some women might not be able to get the pill in time to prevent a pregnancy unless they are made available over the counter.
The morning-after pill is essentially a high-dose birth control pill. It is different from the RU-486 abortion pill, which acts by causing contractions to expel an embryo from the uterus. RU-486 can be given up to seven weeks after the start of the last menstrual period.
There are two morning-after pills on the market: Preven and Plan B. They were approved for U.S. use within the past two years.
For the FDA to make them available over the counter, a pharmaceutical company would have submit an application. The FDA would take into account such things as the drug's written instructions and its safety history.
FDA spokeswoman Susan Cruzan would not disclose whether the morning-after pill's makers have applied for over-the-counter sale.
The Vatican recently condemned the morning-after pill, and the nation's largest retailer, Wal-Mart, decided last year not to offer it at its 2,400 pharmacies, saying it might not sell well enough to make it worthwhile.
Coombs said that if the FDA makes the drug available over the counter, ``it will make it more acceptable and consumers will demand it.''
Although the morning-after pill is not as widely opposed as RU-486, opponents still consider it a form of abortion.
Cathy Cleaver, a spokeswoman with the National Conference of Catholic Bishops anti-abortion Secretariat for Pro-Life Activities, said proponents of the pill are misleading the public with claims that it prevents pregnancies rather than causing abortions.
Cleaver said that if the pill is widely available, teen-age girls would be able to buy it without parental involvement, even in states where parents must be notified when their daughters have abortions.
Planned Parenthood does not consider the pill a form of abortion since it does not work if a fertilized egg has already implanted itself in the uterus.
The side effects can include nausea and vomiting, but an AMA council said in a report that serious side effects are rare and the pill is ``considered safe and effective by the medical community as a whole.''