Took Prednisone Before You Knew You Were Pregnant?

What does the evidence say about took prednisone before you knew you were pregnant during pregnancy?

1. MotherToBaby states that prednisone or prednisolone is not expected to increase miscarriage or greatly increase birth-difference risk; older studies suggested a very small first-trimester cleft possibility, but newer studies and reanalysis did not confirm it, and most pregnancies would be unaffected even if a small risk exists. 1
2. A population study of 83,043 first-time mothers included 1,449 who filled oral or inhaled corticosteroid prescriptions from 30 days before conception through the first trimester; congenital malformations overall were not increased, and the oral-cleft estimate was based on one exposed case with a very wide confidence interval. 2
3. In a US population-based case-control study using 2,372 cleft cases and 5,922 controls from 2003 through 2009, corticosteroid exposure from four weeks before conception through 12 weeks after conception was not associated with cleft lip and palate, with an odds ratio of 1.0 and 95% confidence interval of 0.7 to 1.4. 3
4. A narrative review found conflicting first-trimester cleft results and little support that systemic corticosteroids independently cause preterm birth, low birth weight, or preeclampsia; most studies did not adequately separate the medicine from the underlying autoimmune disease or its severity, and no evidence defines the risk of one specific short course. 4
5. Poorly controlled asthma itself is associated with higher rates of preterm delivery, low birth weight, cesarean birth, placental problems, hemorrhage, high blood pressure, and preeclampsia, while well-controlled asthma is not expected to add pregnancy risk; stopping medicine solely because pregnancy was recognized can therefore create a different risk. 5

Is took prednisone before you knew you were pregnant safe in each trimester?

• First trimester. First-trimester exposure is the focus of the cleft concern, but newer cohort and case-control studies did not confirm the older signal. A past short course does not predict that a cleft occurred. Tell the prescriber the dose, dates, indication, and whether you are still taking prednisone so the plan can be individualized.
• Second trimester. If prednisone is still needed, the decision shifts from accidental exposure to balancing dose, duration, and control of the underlying condition. The evidence does not isolate a universal safe dose. Reviews recommend the lowest dose and shortest duration that safely controls active disease, without sacrificing control of asthma or autoimmune activity.
• Third trimester. Long-term oral corticosteroid use has been associated with preterm birth and lower birth weight, but studies often cannot separate medicine effects from the illness and its severity. Keep the obstetric team informed about ongoing dose and duration. Do not taper or stop chronic prednisone without the prescriber's plan.