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Some Common Painkillers Linked to Miscarriage Risk

Study Suggests Miscarriage Risk From Using NSAIDs Like Ibuprofen or Naproxen During Pregnancy
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Study Limitations continued...

One difference that leapt out at him involved prescriptions for anti-nausea medications, which are sometimes prescribed for morning sickness.

About 15% of the women who didn't have miscarriages got prescriptions for anti-nausea drugs, compared to about 3% of the women who miscarried, a fivefold difference.

"Morning sickness protects against miscarriages," Koren says.

Other differences between the groups were higher rates of depression and anxiety and poverty in the miscarriage group than in the comparison group, though researchers tried to remove the influence of those things by adjusting their data to account for them.

Advice to Women

Taken together, he says he thinks pregnant women should not worry if they have taken an NSAID medication.

"Scaring pregnant women is a national sport in Canada and the United States, and I don't think this is good," Koren says. "It may lead women to not treat themselves when they need it, or even to terminate a wanted pregnancy. I think we have to be extremely careful before we make an association that has major methodological issues."

Study researchers acknowledge that more research is needed to prove that NSAIDs cause miscarriage.

But Bérard says she thinks that in this case, when there are other, perhaps safer choices of pain relievers for pregnant women to use, it's good to get the word out in case the increased risk is real.

"At least during the first trimester, women should think about safer alternatives, and I'm thinking of acetaminophen here," she says. Acetaminophen is the generic name for Tylenol and multiple other medication brands.

Bérard says women can lower their risk of inadvertent exposure by planning their pregnancies.

Planning a pregnancy may be even more important, she says, for women with chronic conditions, like rheumatoid arthritis, who rely on regular NSAIDs to control their joint pain.

Pregnant women should never self-prescribe medication, Koren says. "Talk to your health care provider," he says. "There may be important issues that need to be discussed."

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