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Registries Help Moms Measure Medication Risk

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Whether it’s because of the flu or seasonal allergies, diabetes or epilepsy, pregnant women must often take prescription medication—usually while worrying about the potential impact on their developing babies.

With studies showing the average woman takes from three to five medications while pregnant, the Food and Drug Administration (FDA) encourages drug makers and moms-to-be to participate in pregnancy registry studies that track the risks from drugs taken during pregnancy or breastfeeding.

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These studies collect and maintain data on the effects of medications used by pregnant and nursing women on themselves and their babies. Participants don’t take experimental drugs or medications they would not ordinarily take. Instead, registries collect information on the effects of already approved drugs—for diabetes, migraines, epilepsy, and other health issues—prescribed to pregnant women. The information is then compared to the effects of the drug on women who are not pregnant.

“The FDA’s goal is to have data about the use of medicines during pregnancy for all medicines that are used by women of childbearing potential,” says Karen Feibus, M.D., an FDA expert in maternal health.

Thalidomide Tragedy

The effects of the drug thalidomide caused one of the great tragedies of the 1950s. As many as 10,000 babies around the world were born with severe deformities after their mothers took the medication for morning sickness and insomnia.

The drug was marketed in Europe, Japan, Australia, and Canada, but it was taken off the market in the early 1960s when the medical community learned that it caused serious birth defects. According to the March of Dimes, about 40 percent of babies exposed to the drug died before or soon after delivery.

FDA medical officer Frances Kelsey refused to support the drug’s approval in the U.S. because she was uncertain about its safety. Because of this, most babies affected by thalidomide were born in other countries.

FDA approved the drug in 1998 for treatment of a skin disorder associated with Hansen's disease, also called leprosy and later from bone marrow cancer, but there are restrictions.

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