(BOSTON) -- Low-income communities have the highest teen pregnancy rates in the U.S., yet emergency contraception may be hardest for girls in those areas to get their hands on, according to a new study.
While pharmacies in underserved communities are just as likely to stock the morning-after pill as pharmacies in more affluent ones, researchers from Boston Medical Center found that pharmacists in poorer areas were more often misinformed about the law and mistakenly were denying 17-year-old girls access to Plan B.
Plan B, or levonorgestrel, prevents a fertilized egg from attaching to the wall of the uterus, if taken within 72 hours of unprotected sex. The drug is sometimes confused with the so-called abortion pill, RU-486, but unlike RU-486, Plan B cannot be used to terminate a pregnancy.
In 2006, Plan B became available for purchase by adults in the U.S. without a prescription. Three years later, in 2009, the FDA lowered the age at which Plan B could be dispensed without a prescription to allow 17 year olds access to the drug without a prescription.
According to the study, pharmacists and pharmacy staff may not be adequately apprised of the change in the law.
"We were very surprised by the results" of the study, said Dr. Tracey Wilkinson, its senior author and a pediatrician at Boston Medical Center. "There is a lot of misinformation about emergency contraception."
Wilkinson also suggested that the box labels on the contraception -- as well as the advertising -- may not be clear, and may be contributing to the problem.
In the study, published in the Journal of the American Medical Association, graduate assistants posed as 17-year-old adolescents and called more than 900 pharmacies in diverse neighborhoods throughout the U.S. to see whether pharmacists would dispense the morning-after pill to the "teen" customers.
Eighty percent of pharmacies said they had Plan B in stock, and the availability of the pill was consistent across the diverse communities, researchers said. But 19 percent of all the pharmacists told the "teenagers" that they could not obtain the pill under any circumstance, and they said the misinformation occurred more often -- 23.7 percent versus 14.6 percent -- in low-income neighborhoods.
While this study focused on pharmacies, Wilkinson said there is a lot of confusion about Plan B within the medical community at large, not just the pharmacies. Given the controversy surrounding the drug, and the changes in the rules and guidelines surrounding access, it's, "not really surprising that it permeates everywhere,'' she said.
Whatever the reason for the misinformation, whether it's a problem with staff education in the pharmacies, high turnover, the relative rarity of teens asking for the drug, she said, "at the end of the day, it puts adolescents in poor neighborhoods at a disadvantage," she said.
Copyright 2012 ABC News Radio