Question 1

What do medical sources say about Prednisone during pregnancy?

Accepted Answer

1st Trimester: MotherToBaby reports that prednisone or prednisolone is not expected to greatly increase the chance of birth defects. It notes older studies suggested a very small possible cleft lip or palate increase with first-trimester use, while newer studies and reviews have not confirmed it; two US case-control analyses found mixed results for corticosteroids as a group, not prednisone alone. ACOG reports the same mixed cleft findings and recommends oral prednisone, prednisolone, or methylprednisolone during pregnancy because the placenta converts them to relatively inactive forms. The product label reports cleft palate in animal studies, says controlled studies in pregnant women are lacking, and states use only if potential benefit justifies potential fetal risk. For rheumatic or musculoskeletal disease, ACR conditionally recommends continuing chronic prednisone below 10 mg daily if indicated and strongly recommends tapering higher doses to below 20 mg daily with a pregnancy-compatible medicine if needed. Ask your provider about your situation. 2nd Trimester: MotherToBaby does not give a separate second-trimester birth-defect estimate. Its sheet says long-term oral corticosteroid use during pregnancy has been associated with preterm delivery and low birth weight, but the illness being treated may also contribute. A 2024 review found prednisone or prednisolone may be associated with lower gestational age, but did not find associations with miscarriage, stillbirth, or congenital abnormalities in the studies it reviewed. ACOG recommends oral prednisone, prednisolone, or methylprednisolone during pregnancy because the placenta converts them to relatively inactive forms, while noting the magnitude of possible long-term risks is unknown. For rheumatic or musculoskeletal disease, ACR conditionally recommends continuing chronic prednisone below 10 mg daily if indicated and strongly recommends tapering higher doses to below 20 mg daily with a pregnancy-compatible medicine if needed. Ask your provider about your situation. 3rd Trimester: MotherToBaby reports long-term oral corticosteroid use during pregnancy has been associated with preterm delivery and low birth weight, but the illness being treated may also contribute. In 528 pregnancies affected by rheumatoid arthritis, a 2020 observational study found prednisone-equivalent doses of at least 10 mg daily later in pregnancy were associated with a higher preterm birth rate; it cannot show that the medicine caused it. The product label says infants born to mothers who received substantial corticosteroid doses during pregnancy should be observed for signs of low adrenal hormone function. A 2017 series of 16 newborns after maternal prednisolone at 10 mg daily or more found no evidence of prolonged effects on the newborn adrenal hormone system, but the small series does not remove the label warning. ACOG recommends oral prednisone or prednisolone during pregnancy because the placenta converts them to relatively inactive forms, while noting the magnitude of possible long-term risks is unknown. Ask your provider about your situation.

Question 2

What do medical sources say about Prednisone while breastfeeding?

Accepted Answer

LactMed reports that prednisone levels in breast milk are very low and that no adverse effects have been reported in breastfed infants with maternal corticosteroid use generally. A small pharmacokinetic study measured milk from only two lactating participants and estimated relative infant doses of 0.35% to 0.58% for prednisone and 0.09% to 0.18% for prednisolone; it did not measure infant blood levels. MotherToBaby reports that prednisone and prednisolone pass into milk in small amounts and that high doses can temporarily reduce milk supply. For rheumatic or musculoskeletal disease, ACR says prednisone below 20 mg daily is compatible with breastfeeding and recommends delaying breastfeeding or discarding milk for four hours after doses above 20 mg daily. LactMed says a routine four-hour wait is not needed because milk levels are very low; the product label warns milk exposure could suppress growth, interfere with the infant's own corticosteroid production, or cause other effects, and says to decide whether to stop nursing or the drug based on the drug's importance to the mother. Ask your provider about your situation.

Question 3

Where do sources disagree on Prednisone in pregnancy or breastfeeding?

Accepted Answer

Do human studies show an increased cleft risk with early pregnancy corticosteroid use? MotherToBaby says older studies suggested a very small possible increase in cleft lip or palate with first-trimester use. Carmichael et al. reported an association between early corticosteroid exposure and cleft lip with or without palate (OR 1.7, 95% CI 1.1 to 2.6). The product label reports cleft palate in animal studies. The later 2003 to 2009 NBDPS analysis found no overall association (OR 1.0, 95% CI 0.7 to 1.4) and little evidence by corticosteroid component or timing. ACOG says more recent data have failed to demonstrate an association. The earlier NBDPS analysis used 1997 to 2002 data and had fewer exposed cases; the later analysis more than doubled the study population with 2003 to 2009 births. Both relied on maternal telephone interviews and combined different corticosteroids, so neither isolates prednisone well. The human findings are mixed and concern corticosteroids as a class, not prednisone alone. ACOG and MotherToBaby describe the early cleft signal as unconfirmed by newer data. Animal findings in the label should remain separate from human findings, and the label warning should not be presented as proof of a human effect.

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